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QW075A1

型号：

QW075A1

描述：

模拟IC\n[ Analog IC ]

品牌：

ETC[ ETC ]

页数：

20 页

PDF大小：

1262 K

下载PDF手册
Data Sheet  
May 2000  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Features  
■ Small size: 36.8 mm x 57.9 mm x 12.7 mm  
(1.45 in. x 2.28 in. x 0.50 in.)  
■ High power density  
■ High efficiency: 84% typical  
■ Low output noise  
■ Constant frequency  
■ Industry-standard pinout  
■ Metal baseplate  
■ 2:1 input voltage range  
■ Overvoltage and overcurrent protection  
■ Remote on/off  
The QW Series Power Modules use advanced, surface-mount  
technology and deliver high-quality, efficient, and compact  
dc-dc conversion.  
■ Remote sense  
■ Adjustable output voltage  
■ Overtemperature protection  
■ ISO* 9001 Certified manufacturing facilities  
■ UL†1950 Recognized, CSA‡ C22.2 No. 950-95  
Certified, and VDE § 0805 (EN60950, IEC950)  
Licensed  
Applications  
■ Distributed power architectures  
■ Workstations  
■ Computer equipment  
■ Communications equipment  
■ CE mark meets 73/23/EEC and 93/68/EEC direc-  
tives**  
* ISO is a registered trademark of the International Organization  
for Standardization.  
Options  
† UL is a registered trademark of Underwriters Laboratories, Inc.  
‡ CSA is a registered trademark of Canadian Standards Associa-  
tion.  
§ VDE is a trademark of Verband Deutscher Elektrotechniker e.V.  
** This product is intended for integration into end-use equipment.  
All the required procedures for CE marking of end-use equip-  
ment should be followed. (The CE mark is placed on selected  
products.)  
■ Heat sinks available for extended operation  
■ Auto-restart after overcurrent shutdown  
Description  
The QW050A1 and QW075A1 Power Modules are dc-dc converters that operate over an input voltage range of  
36 Vdc to 75 Vdc and provide a precisely regulated dc output. The outputs are fully isolated from the inputs,  
allowing versatile polarity configurations and grounding connections. The modules have maximum power rat-  
ings from 50 W to 75 W at a typical full-load efficiency of 84%.  
The sealed modules offer a metal baseplate for excellent thermal performance. Threaded-through holes are pro-  
vided to allow easy mounting or addition of a heat sink for high-temperature applications.The standard feature set  
includes remote sensing, output trim, and remote on/off for convenient flexibility in distributed power applications.  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Data Sheet  
May 2000  
Absolute Maximum Ratings  
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-  
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess  
of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended  
periods can adversely affect device reliability.  
Parameter  
Symbol  
Min  
Max  
Unit  
Input Voltage:  
Continuous  
VI  
VI, trans  
—
—
75  
100  
Vdc  
V
Transient (100 ms)  
Operating Case Temperature  
(See Thermal Considerations section; see  
Figure 22.)  
TC  
–40  
100  
°C  
Storage Temperature  
Tstg  
—
–55  
—
125  
°C  
I/O Isolation Voltage (for 1 minute)  
1500  
Vdc  
Electrical Specifications  
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature  
conditions.  
Table 1. Input Specifications  
Parameter  
Operating Input Voltage  
Symbol  
Min  
Typ  
Max  
Unit  
VI  
36  
48  
75  
Vdc  
Maximum Input Current  
(VI = 0 V to 75 V; IO = IO, max; see Figures 1 and  
2):  
QW050A1  
QW075A1  
II, max  
II, max  
—
—
—
—
2.5  
3.5  
A
A
Inrush Transient  
i2t  
—
—
—
1.3  
—
A2s  
Input Reflected-ripple Current, Peak-to-peak  
(5 Hz to 20 MHz, 12 µH source impedance;  
see Figure 13.)  
II  
10  
mAp-p  
Input Ripple Rejection (120 Hz)  
—
—
60  
—
dB  
Fusing Considerations  
CAUTION:This power module is not internally fused. An input line fuse must always be used.  
This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone  
operation to an integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fus-  
ing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. The  
safety agencies require a normal-blow fuse with a maximum rating of 3 A (see Safety Considerations section).  
Based on the information provided in this data sheet on inrush energy and maximum dc input current, the same  
type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data for further information.  
2
Lucent Technologies Inc.  
Data Sheet  
May 2000  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Electrical Specifications (continued)  
Table 2. Output Specifications  
Parameter  
Device  
Symbol  
Min  
Typ  
Max  
Unit  
Output Voltage Set Point  
All  
VO, set  
4.92  
5.0  
5.08  
Vdc  
(VI = 48 V; IO = IO, max; TC = 25 °C)  
Output Voltage  
All  
VO  
4.85  
—
5.15  
Vdc  
(Over all operating input voltage, resistive load,  
and temperature conditions until end of life. See  
Figure 15.)  
Output Regulation:  
Line (VI = 36 V to 75 V)  
Load (IO = IO, min to IO, max)  
Temperature (TC = –40 °C to +100 °C)  
All  
All  
All  
—
—
—
—
—
—
0.01  
0.05  
15  
0.1  
0.2  
50  
%VO  
%VO  
mV  
Output Ripple and Noise Voltage  
(See Figure 14.):  
RMS  
All  
All  
—
—
—
—
—
—
40  
150  
mVrms  
mVp-p  
Peak-to-peak (5 Hz to 20 MHz)  
*
External Load Capacitance  
All  
—
0
—
µF  
Output Current  
QW050A1  
IO  
IO  
0.5  
0.5  
—
—
10  
15  
A
A
(At IO < IO, min, the modules may exceed output QW075A1  
ripple specifications.)  
Output Current-limit Inception  
(VO = 90% of VO, nom)  
QW050A1  
QW075A1  
IO, cli  
IO, cli  
—
—
15  
20  
20†  
26†  
A
A
Efficiency (VI = 48 V; IO = IO, max; TC = 70 °C)  
QW050A1  
QW075A1  
η
η
—
—
84  
84  
—
—
%
%
Switching Frequency  
All  
—
—
380  
—
kHz  
Dynamic Response  
(∆IO/∆t = 1 A/10 µs, VI = 48 V, TC = 25 °C; tested  
with a 1000 µF aluminum and a 1.0 µF ceramic  
capacitor across the load.):  
Load Change from IO = 50% to 75% of IO, max:  
Peak Deviation  
Settling Time (VO < 10% of peak deviation)  
Load Change from IO = 50% to 25% of IO, max:  
Peak Deviation  
All  
All  
—
—
—
—
5
700  
—
—
%VO, set  
µs  
All  
All  
—
—
—
—
5
700  
—
—
%VO, set  
µs  
Settling Time (VO < 10% of peak deviation)  
* Consult your sales representative or the factory.  
† These are manufacturing test limits. In some situations, results may differ.  
Table 3. Isolation Specifications  
Parameter  
Min  
—
Typ  
Max  
Unit  
pF  
Isolation Capacitance  
Isolation Resistance  
2500  
—
—
—
10  
MΩ  
Lucent Technologies Inc.  
3
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Data Sheet  
May 2000  
General Specifications  
Parameter  
Min  
Typ  
Max  
Unit  
Calculated MTBF (IO = 80% of IO, max; TC = 40 °C):  
QW050A1  
QW075A1  
4,000,000  
3,500,000  
hours  
hours  
Weight  
—
—
75 (2.7)  
g (oz.)  
Feature Specifications  
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature  
conditions. See Feature Descriptions for additional information.  
Parameter  
Remote On/Off Signal Interface  
Symbol  
Min  
Typ  
Max  
Unit  
(VI = 0 V to 75 V; open collector or equivalent compatible;  
signal referenced to VI(–) terminal; see Figure 16 and  
Feature Descriptions.):  
Logic Low—Module On  
Logic High—Module Off  
Logic Low:  
At Ion/off = 1.0 mA  
At Von/off = 0.0 V  
Von/off  
Ion/off  
0
—
—
—
1.2  
1.0  
V
mA  
Logic High:  
At Ion/off = 0.0 µA  
Leakage Current  
Turn-on Time (See Figures 11 and 12.)  
(IO = 80% of IO, max; VO within ±1% of steady state)  
Von/off  
Ion/off  
—
—
—
—
—
—
20  
15  
50  
35  
V
µA  
ms  
Output Voltage Adjustment (See Feature Descriptions.):  
Output Voltage Remote-sense Range  
—
—
—
60  
—
—
0.5  
110  
V
Output Voltage Set-point Adjustment Range (trim)  
%VO, nom  
Output Overvoltage Protection  
Overtemperature Protection  
VO, sd  
TC  
5.7*  
—
—
6.8*  
—
V
105  
°C  
* These are manufacturing test limits. In some situations, results may differ.  
Solder, Cleaning, and Drying Considerations  
Post solder cleaning is usually the final circuit-board assembly process prior to electrical testing. The result of inad-  
equate circuit-board cleaning and drying can affect both the reliability of a power module and the testability of the  
finished circuit-board assembly. For guidance on appropriate soldering, cleaning, and drying procedures, refer to  
Lucent Technologies Board-Mounted Power Modules Soldering and Cleaning Application Note (AP97-021EPS).  
4
Lucent Technologies Inc.  
Data Sheet  
May 2000  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Characteristic Curves  
The following figures provide typical characteristics for the power modules. The figures are identical for both on/off  
configurations.  
2.5  
2.0  
85  
84  
83  
82  
81  
80  
79  
78  
77  
IO = 10 A  
IO = 6 A  
IO = 1 A  
1.5  
1.0  
VI = 36 V  
VI = 48 V  
VI = 75 V  
0.5  
0.0  
76  
75  
20 25 30 35 40 45 50 55 60 65 70 75  
2
3
4
5
6
7
8
9
10  
INPUT VOLTAGE, VI (V)  
OUTPUT CURRENT, IO (A)  
Note: Pending improvement will add 1% to the above curves.  
8-2949 (F)  
8-2950 (F)  
Figure 1. Typical QW050A1 Input Characteristics at  
Room Temperature  
Figure 3. Typical QW050A1 Converter Efficiency  
vs. Output Current at Room Temperature  
3.5  
3.0  
85  
84  
83  
82  
81  
I
I
I
O
O
O
= 15 A  
= 7.5 A  
= 1.5 A  
2.5  
2.0  
1.5  
1.0  
0.5  
0.0  
80  
VI = 36 V  
VI = 54 V  
VI = 75 V  
79  
78  
77  
76  
75  
20 25 30 35 40 45 50 55 60 65 70 75  
3
4
5
6
7
8
9
10 11 12 13 14 15  
INPUT VOLTAGE, V (V)  
I
8-2327 (C)  
OUTPUT CURRENT, IO (A)  
8-2951 (F)  
Figure 2. Typical QW075A1 Input Characteristics at  
Room Temperature  
Note: Pending improvement will add 1% to the above curves.  
Figure 4. Typical QW075A1 Converter Efficiency  
vs. Output Current at Room Temperature  
Lucent Technologies Inc.  
5
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Data Sheet  
May 2000  
Characteristic Curves (continued)  
VI  
VI  
VI  
= 75 V  
= 54 V  
= 36 V  
5 A  
2.5 A  
TIME, t (500 µs/div)  
8-2952 (F)  
Note: Tested with a 1000 µF aluminum and a 1.0 µF ceramic capaci-  
tor across the load.  
TIME, t (1 µs/div)  
8-2062 (C)  
Figure 7. Typical QW050A1 Transient Response to  
Step Decrease in Load from 50% to 25%  
of IO, max at Room Temperature and  
Figure 5. Typical QW050A1 Output Ripple Voltage  
at Room Temperature and IO = IO, max  
54 Vdc Input (Waveform Averaged to  
Eliminate Ripple Component.)  
VI  
= 75 V  
V
I
= 54 V  
= 36 V  
7.5 A  
VI  
3.75 A  
TIME, t (1 µs/div)  
Note: See Figure 14 for test conditions.  
TIME, t (200 ns/div)  
8-2953 (F)  
8-2298 (C)  
Note: Tested with a 1000 µF aluminum and a 1.0 µF ceramic capaci-  
tor across the load.  
Figure 6. Typical QW075A1 Output Ripple Voltage  
at Room Temperature and IO = IO, max  
Figure 8. Typical QW075A1 Transient Response to  
Step Decrease in Load from 50% to 25%  
of IO, max at Room Temperature and  
54 Vdc Input (Waveform Averaged to  
Eliminate Ripple Component.)  
6
Lucent Technologies Inc.  
Data Sheet  
May 2000  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Characteristic Curves (continued)  
7.5 A  
5.0 A  
TIME, t (5 ms/div)  
TIME, t (500 µs/div)  
8-3027 (F)  
Note: Tested with a 1000 µF aluminum and a 1.0 µF ceramic capaci-  
tor across the load.  
8-2954 (F)  
Note: Tested with a 1000 µF aluminum and a 1.0 µF ceramic capaci-  
tor across the load.  
Figure 11. QW050A1Typical Start-Up from Remote  
Figure 9. Typical QW050A1 Transient Response to  
Step Increase in Load from 50% to 75% of  
IO, max at Room Temperature and 54 Vdc  
Input (Waveform Averaged to Eliminate  
Ripple Component.)  
On/Off; IO = IO, max  
11.25 A  
7.5 A  
TIME, t (2 ms/div)  
8-2956 (F)  
TIME, t (200 µs/div)  
Note: Tested with a 1000 µF aluminum and a 1.0 µF ceramic capaci-  
tor across the load.  
8-2955 (F)  
Note: Tested with a 220 µF aluminum and a 1.0 µF ceramic capacitor  
across the load.  
Figure 12. QW075A1Typical Start-Up from Remote  
On/Off; IO = IO, max  
Figure 10. Typical QW075A1Transient Response to  
Step Increase in Load from 50% to 75%  
of IO, max at Room Temperature and  
54 Vdc Input (Waveform Averaged to  
Eliminate Ripple Component.)  
Lucent Technologies Inc.  
7
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Data Sheet  
May 2000  
Test Configurations  
Design Considerations  
Input Source Impedance  
TO OSCILLOSCOPE  
CURRENT  
PROBE  
The power module should be connected to a low  
ac-impedance input source. Highly inductive source  
impedances can affect the stability of the power mod-  
ule. For the test configuration in Figure 13, a 33 µF  
electrolytic capacitor (ESR < 0.7 Ω at 100 kHz)  
mounted close to the power module helps ensure sta-  
bility of the unit. For other highly inductive source  
impedances, consult the factory for further application  
guidelines.  
L
TEST  
VI(+)  
12 µH  
CS 220 µF  
ESR < 0.1 Ω  
@ 20 °C, 100 kHz  
33 µF  
ESR < 0.7 Ω  
@ 100 kHz  
BATTERY  
VI(–)  
8-203 (C).l  
Note: Measure input reflected-ripple current with a simulated source  
inductance (LTEST) of 12 µH. Capacitor CS offsets possible bat-  
tery impedance. Measure current as shown above.  
Safety Considerations  
Figure 13. Input Reflected-Ripple Test Setup  
For safety-agency approval of the system in which the  
power module is used, the power module must be  
installed in compliance with the spacing and separation  
requirements of the end-use safety agency standard,  
i.e., UL1950, CSA C22.2 No. 950-95, and VDE 0805  
(EN60950, IEC950).  
COPPER STRIP  
V
V
O
O
(+)  
(–)  
RESISTIVE  
LOAD  
If the input source is non-SELV (ELV or a hazardous  
voltage greater than 60 Vdc and less than or equal to  
75 Vdc), for the module’s output to be considered meet-  
ing the requirements of safety extra-low voltage  
(SELV), all of the following must be true:  
1.0 µF  
10 µF  
SCOPE  
8-513 (C).d  
■ The input source is to be provided with reinforced  
insulation from any hazardous voltages, including the  
ac mains.  
Note: Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or tan-  
talum capacitor. Scope measurement should be made using a  
BNC socket. Position the load between 51 mm and 76 mm  
(2 in. and 3 in.) from the module.  
■ One VI pin and one VO pin are to be grounded, or  
both the input and output pins are to be kept floating.  
Figure 14. Peak-to-Peak Output Noise  
Measurement Test Setup  
■ The input pins of the module are not operator acces-  
sible.  
■ Another SELV reliability test is conducted on the  
whole system, as required by the safety agencies, on  
the combination of supply source and the subject  
module to verify that under a single fault, hazardous  
voltages do not appear at the module’s output.  
SENSE(+)  
CONTACT AND  
DISTRIBUTION LOSSES  
V
I
I
(+)  
(–)  
VO(+)  
I
O
I
I
LOAD  
SUPPLY  
Note: Do not ground either of the input pins of the  
module without grounding one of the output pins.  
This may allow a non-SELV voltage to appear  
between the output pin and ground.  
V
VO(–)  
CONTACT  
RESISTANCE  
SENSE(–)  
8-749 (C)  
The power module has extra-low voltage (ELV) outputs  
when all inputs are ELV.  
Note: All measurements are taken at the module terminals. When  
socketing, place Kelvin connections at module terminals to  
avoid measurement errors due to socket contact resistance.  
The input to these units is to be provided with a maxi-  
mum 3 A normal-blow fuse in the ungrounded lead.  
[VO(+) – VO(–)]IO  
[VI(+) – VI(–)]II  
η =  
x 100  
%
------------------------------------------------  
Figure 15. Output Voltage and Efficiency  
Measurement Test Setup  
8
Lucent Technologies Inc.  
 
Data Sheet  
May 2000  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Feature Descriptions  
Overcurrent Protection  
Ion/off  
ON/OFF  
+
Von/off  
SENSE(+)  
–
To provide protection in a fault (output overload) condi-  
tion, the unit is equipped with internal current-limiting  
circuitry and can endure current limiting for up to one  
second. If overcurrent exists for more than one second,  
the unit will shut down.  
VO(+)  
LOAD  
VO(–)  
VI(+)  
VI(–)  
SENSE(–)  
At the point of current-limit inception, the unit shifts  
from voltage control to current control. If the output volt-  
age is pulled very low during a severe fault, the current-  
limit circuit can exhibit either foldback or tailout charac-  
teristics (output current decrease or increase).  
8-720 (C).c  
Figure 16. Remote On/Off Implementation  
The module is available in two overcurrent configura-  
tions. In one configuration, when the unit shuts down it  
will latch off. The overcurrent latch is reset by either  
cycling the input power or by toggling the ON/OFF pin  
for one second. In the other configuration, the unit will  
try to restart after shutdown. If the output overload con-  
dition still exists when the unit restarts, it will shut down  
again. This operation will continue indefinitely until the  
overcurrent condition is corrected.  
Remote Sense  
Remote sense minimizes the effects of distribution  
losses by regulating the voltage at the remote-sense  
connections. The voltage between the remote-sense  
pins and the output terminals must not exceed the out-  
put voltage sense range given in the Feature Specifica-  
tions table, i.e.:  
Remote On/Off  
[VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5 V  
The voltage between the VO(+) and VO(–) terminals  
must not exceed the minimum output overvoltage pro-  
tection value shown in the Feature Specifications table.  
This limit includes any increase in voltage due to  
remote-sense compensation and output voltage set-  
point adjustment (trim). See Figure 17.  
Negative logic remote on/off turns the module off dur-  
ing a logic high and on during a logic low. To turn the  
power module on and off, the user must supply a switch  
to control the voltage between the on/off terminal and  
the VI(–) terminal (Von/off). The switch can be an open  
collector or equivalent (see Figure 16). A logic low is  
Von/off = 0 V to 1.2 V. The maximum Ion/off during a logic  
low is 1 mA. The switch should maintain a logic-low  
voltage while sinking 1 mA.  
If not using the remote-sense feature to regulate the  
output at the point of load, then connect SENSE(+) to  
VO(+) and SENSE(–) to VO(–) at the module.  
During a logic high, the maximum Von/off generated by  
the power module is 15 V. The maximum allowable  
leakage current of the switch at Von/off = 15 V is 50 µA.  
Although the output voltage can be increased by both  
the remote sense and by the trim, the maximum  
increase for the output voltage is not the sum of both.  
The maximum increase is the larger of either the  
remote sense or the trim. Consult the factory if you  
need to increase the output voltage more than the  
above limitation.  
If not using the remote on/off feature, short the ON/OFF  
pin to VI(–).  
The amount of power delivered by the module is  
defined as the voltage at the output terminals multiplied  
by the output current. When using remote sense and  
trim, the output voltage of the module can be  
increased, which at the same output current would  
increase the power output of the module. Care should  
be taken to ensure that the maximum output power of  
the module remains at or below the maximum rated  
power.  
Lucent Technologies Inc.  
9
 
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Data Sheet  
May 2000  
remote-sense compensation and output voltage set-  
point adjustment (trim). See Figure 17.  
Feature Descriptions (continued)  
Remote Sense (continued)  
Although the output voltage can be increased by both  
the remote sense and by the trim, the maximum  
increase for the output voltage is not the sum of both.  
The maximum increase is the larger of either the  
remote sense or the trim. Consult the factory if you  
need to increase the output voltage more than the  
above limitation.  
SENSE(+)  
SENSE(–)  
V
V
I
I
(+)  
(–)  
V
O
(+)  
(–)  
I
O
SUPPLY  
LOAD  
The amount of power delivered by the module is  
defined as the voltage at the output terminals multiplied  
by the output current. When using remote sense and  
trim, the output voltage of the module can be  
increased, which at the same output current would  
increase the power output of the module. Care should  
be taken to ensure that the maximum output power of  
the module remains at or below the maximum rated  
power.  
I
I
V
O
CONTACT  
RESISTANCE  
CONTACT AND  
DISTRIBUTION LOSSES  
8-651 (C).m  
Figure 17. Effective Circuit Configuration for  
Single-Module Remote-Sense Operation  
Output Voltage Set-Point Adjustment  
(Trim)  
VI(+)  
VO(+)  
Output voltage trim allows the user to increase or  
decrease the output voltage set point of a module.This  
is accomplished by connecting an external resistor  
between the TRIM pin and either the SENSE(+) or  
SENSE(–) pins. The trim resistor should be positioned  
close to the module.  
ON/OFF SENSE(+)  
CASE  
VI(–)  
TRIM  
SENSE(–)  
VO(–)  
RLOAD  
Radj-down  
If not using the trim feature, leave the TRIM pin open.  
8-748 (C).b  
With an external resistor between the TRIM and  
SENSE(–) pins (Radj-down), the output voltage set point  
(VO, adj) decreases (see Figure 18). The following equa-  
tion determines the required external-resistor value to  
obtain a percentage output voltage change of ∆%.  
Figure 18. Circuit Configuration to Decrease  
Output Voltage  
510  
∆%  
1M  
100k  
10k  
1k  
Radj-down =  
– 10.2 kΩ  
---------  
The test results for this configuration are displayed in  
Figure 19. This figure applies to all output voltages.  
With an external resistor connected between the TRIM  
and SENSE(+) pins (Radj-up), the output voltage set  
point (VO, adj) increases (see Figure 20).  
The following equation determines the required exter-  
nal-resistor value to obtain a percentage output voltage  
change of ∆%.  
5.1VO(100 + ∆%)  
----------------------------------------------  
1.225∆%  
510  
Radj-up =  
–
– 10.2 kΩ  
---------  
0
10  
20  
30  
40  
∆%  
% CHANGE IN OUTPUT VOLTAGE (∆%)  
The test results for this configuration are displayed in  
Figure 21.  
8-2577 (C)  
Figure 19. Resistor Selection for Decreased  
Output Voltage  
The voltage between the VO(+) and VO(–) terminals  
must not exceed the minimum output overvoltage pro-  
tection value shown in the Feature Specifications table.  
This limit includes any increase in voltage due to  
10  
Lucent Technologies Inc.  
 
 
 
Data Sheet  
May 2000  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Overtemperature Protection  
Feature Descriptions (continued)  
These modules feature an overtemperature protection  
circuit to safeguard against thermal damage.The circuit  
shuts down and latches off the module when the maxi-  
mum case temperature is exceeded. The module can  
be restarted by cycling the dc input power for at least  
1.0 second or by toggling the remote on/off signal for at  
least 1.0 second.  
Output Voltage Set-Point Adjustment  
(Trim) (continued)  
V
I
(+)  
VO(+)  
ON/OFF SENSE(+)  
Radj-up  
RLOAD  
CASE  
(–)  
TRIM  
Thermal Considerations  
Introduction  
V
I
SENSE(–)  
VO(–)  
The power modules operate in a variety of thermal  
environments; however, sufficient cooling should be  
provided to help ensure reliable operation of the unit.  
Heat-dissipating components inside the unit are ther-  
mally coupled to the case. Heat is removed by conduc-  
tion, convection, and radiation to the surrounding  
environment. Proper cooling can be verified by mea-  
suring the case temperature. Peak temperature (TC)  
occurs at the position indicated in Figure 22.  
8-715 (C).b  
Figure 20. Circuit Configuration to Increase  
Output Voltage  
10M  
33 (1.30)  
14  
(0.55)  
1M  
VO(+)  
(+)SENSE  
TRIM  
(–)SENSE  
VO(–)  
VI(+)  
ON/OFF  
VI(–)  
100k  
0
2
4
6
8
10  
8-2104 (C)  
% CHANGE IN OUTPUT VOLTAGE ( ∆%)  
Note: Top view, pin locations are for reference only.  
Measurements shown in millimeters and (inches).  
8-2855 (F)  
Figure 21. Resistor Selection for Increased Output  
Voltage  
Figure 22. Case Temperature Measurement  
Location  
Output Overvoltage Protection  
The temperature at this location should not exceed  
100 °C. The output power of the module should not  
exceed the rated power for the module as listed in the  
Ordering Information table.  
The output overvoltage protection consists of circuitry  
that monitors the voltage on the output terminals. If the  
voltage on the output terminals exceeds the overvolt-  
age protection threshold, then the module will shut  
down and latch off. The overvoltage latch is reset by  
either cycling the input power for 1.0 second or by tog-  
gling the on/off signal for 1.0 second.  
Although the maximum case temperature of the power  
modules is 100 °C, you can limit this temperature to a  
lower value for extremely high reliability.  
Lucent Technologies Inc.  
11  
 
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Data Sheet  
May 2000  
Thermal Considerations (continued)  
11  
10  
Heat Transfer Without Heat Sinks  
9
Increasing airflow over the module enhances the heat  
8
transfer via convection. Figure 25 shows the maximum  
power that can be dissipated by the module without  
exceeding the maximum case temperature versus local  
7
6
ambient temperature (TA) for natural convection  
through 4 m/s (800 ft./min.).  
VI = 75 V  
VI = 48 V  
VI = 36 V  
5
Note that the natural convection condition was mea-  
sured at 0.05 m/s to 0.1 m/s (10 ft./min. to 20 ft./min.);  
however, systems in which these power modules may  
4
SEE NOTE  
3
1
2
3
4
5
6
7
8
9
10  
be used typically generate natural convection airflow  
rates of 0.3 m/s (60 ft./min.) due to other heat dissipat-  
ing components in the system. The use of Figure 25 is  
shown in the following example.  
OUTPUT CURRENT, IO (A)  
8-2957 (F)  
Note: Pending improvement will lower the power dissipation.  
Figure 23. QW050A1 Power Dissipation vs.  
Output Current at 25 °C  
Example  
What is the minimum airflow necessary for a QW050A1  
operating at VI = 54 V, an output current of 10 A, and a  
maximum ambient temperature of 40 °C?  
16  
14  
Solution  
Given: VI = 54 V  
IO = 10 A  
12  
10  
8
TA = 40 °C  
Determine PD (Use Figure 23.):  
PD = 10 W  
VI = 75 V  
VI = 54 V  
VI = 36 V  
Determine airflow (v) (Use Figure 25.):  
v = 1.25 m/s (250 ft./min.)  
6
SEE NOTE  
4
Note: Pending improvement will lower the power dissi-  
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15  
pation and reduce the airflow needed.  
OUTPUT CURRENT, IO (A)  
8-2958 (F)  
Note: Pending improvement will lower the power dissipation.  
Figure 24. QW075A1 Power Dissipation vs.  
Output Current at 25 °C  
12  
Lucent Technologies Inc.  
Data Sheet  
May 2000  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Thermal Considerations (continued)  
11  
10  
NO HEAT SINK  
1/4 IN. HEAT SINK  
1/2 IN. HEAT SINK  
Heat Transfer Without Heat Sinks (continued)  
9
8
7
6
5
4
3
2
1 IN. HEAT SINK  
20  
4.0 m/s (800 ft./min.)  
3.5 m/s (700 ft./min.)  
3.0 m/s (600 ft./min.)  
2.5 m/s (500 ft./min.)  
2.0 m/s (400 ft./min.)  
1.5 m/s (300 ft./min.)  
1.0 m/s (200 ft./min.)  
0.5 m/s (100 ft./min.)  
0.1 m/s (20 ft./min.)  
15  
NATURAL CONVECTION  
10  
5
1
0
NAT  
CONV  
0.5  
(100)  
1.0  
(200)  
1.5  
(300)  
2.0  
(400)  
2.5  
(500)  
3.0  
(600)  
AIR VELOCITY, m/s (ft./min.)  
8-2107 (C)  
0
0
10  
20  
30  
40  
50  
60  
70  
80  
(°C)  
90 100  
Figure 26. Case-to-Ambient Thermal Resistance  
Curves;Transverse Orientation  
LOCAL AMBIENT TEMPERATURE, T  
A
8-2306 (C).a  
Figure 25. Forced Convection Power Derating with  
No Heat Sink; Either Orientation  
11  
10  
NO HEAT SINK  
1/4 IN. HEAT SINK  
9
8
7
6
5
4
3
2
1
1/2 IN. HEAT SINK  
1 IN. HEAT SINK  
Heat Transfer with Heat Sinks  
The power modules have through-threaded, M3 x 0.5  
mounting holes, which enable heat sinks or cold plates  
to attach to the module. The mounting torque must not  
exceed 0.56 N-m (5 in.-lb.). For a screw attachment  
from the pin side, the recommended hole size on the  
customer’s PWB around the mounting holes is 0.130  
± 0.005 inches. If a larger hole is used, the mounting  
torque from the pin side must not exceed 0.25 N-m  
(2.2 in.-lbs.).  
0
NAT  
CONV  
0.5  
(100)  
1.0  
(200)  
1.5  
(300)  
2.0  
(400)  
2.5  
3.0  
(600)  
(500)  
AIR VELOCITY, m/s (ft./min.)  
8-2108 (C)  
Thermal derating with heat sinks is expressed by using  
the overall thermal resistance of the module.Total mod-  
ule thermal resistance (θca) is defined as the maximum  
case temperature rise (∆TC, max) divided by the module  
power dissipation (PD):  
Figure 27. Case-to-Ambient Thermal Resistance  
Curves; Longitudinal Orientation  
∆TC, max  
---------------------  
PD  
(TC – TA)  
------------------------  
PD  
θca =  
=
The location to measure case temperature (TC) is  
shown in Figure 22. Case-to-ambient thermal resis-  
tance vs. airflow is shown, for various heat sink config-  
urations, heights, and orientations, as shown in  
Figures 26 and 27. Longitudinal orientation is defined  
as the long axis of the module that is parallel to the air-  
flow direction, whereas in the transverse orientation,  
the long axis is perpendicular to the airflow. These  
curves were obtained by experimental testing of heat  
sinks, which are offered in the product catalog.  
Lucent Technologies Inc.  
13  
 
 
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Data Sheet  
May 2000  
Thermal Considerations (continued)  
20  
18  
Heat Transfer with Heat Sinks (continued)  
16  
14  
12  
20  
18  
10  
1 IN. HEAT SINK  
1/2 IN. HEAT SINK  
1/4 IN. HEAT SINK  
NO HEAT SINK  
16  
14  
12  
10  
8
8
6
4
1 IN. HEAT SINK  
1/2 IN. HEAT SINK  
1/4 IN. HEAT SINK  
NO HEAT SINK  
2
0
6
0
10  
20  
30  
40  
50  
60  
70  
80  
(°C)  
90 100  
4
LOCAL AMBIENT TEMPERATURE, T  
A
2
0
8-2382 (C)  
0
10  
20  
30  
40  
50  
60  
70  
80  
(°C)  
90 100  
Figure 30. Heat Sink Power Derating Curves;  
1.0 m/s (200 lfm);Transverse Orientation  
LOCAL AMBIENT TEMPERATURE, T  
A
8-2380 (C)  
Figure 28. Heat Sink Power Derating Curves;  
Natural Convection;Transverse  
Orientation  
20  
18  
16  
14  
12  
10  
8
20  
18  
1 IN. HEAT SINK  
1/2 IN. HEAT SINK  
1/4 IN. HEAT SINK  
NO HEAT SINK  
16  
14  
12  
10  
8
1 IN. HEAT SINK  
1/2 IN. HEAT SINK  
1/4 IN. HEAT SINK  
NO HEAT SINK  
6
4
2
0
0
10  
20  
30  
40  
50  
60  
70  
80  
(°C)  
90 100  
6
4
LOCAL AMBIENT TEMPERATURE, T  
A
8-2383 (C)  
2
0
Figure 31. Heat Sink Power Derating Curves;  
1.0 m/s (200 lfm); Longitudinal  
Orientation  
0
10  
20  
30  
40  
50  
60  
70  
80  
(°C)  
90 100  
LOCAL AMBIENT TEMPERATURE, T  
A
8-2381 (C)  
Figure 29. Heat Sink Power Derating Curves;  
Natural Convection; Longitudinal  
Orientation  
These measured resistances are from heat transfer  
from the sides and bottom of the module as well as the  
top side with the attached heat sink; therefore, the  
case-to-ambient thermal resistances shown are gener-  
ally lower than the resistance of the heat sink by itself.  
The module used to collect the data in Figures 26 and  
27 had a thermal-conductive dry pad between the case  
and the heat sink to minimize contact resistance. The  
use of Figures 26 and 27 are shown in the following  
example.  
14  
Lucent Technologies Inc.  
Data Sheet  
May 2000  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Custom Heat Sinks  
Thermal Considerations (continued)  
A more detailed model can be used to determine the  
required thermal resistance of a heat sink to provide  
necessary cooling. The total module resistance can be  
separated into a resistance from case-to-sink (θcs) and  
sink-to-ambient (θsa) as shown in Figure 32.  
Heat Transfer with Heat Sinks (continued)  
Example  
If an 85 °C case temperature is desired, what is the  
minimum airflow necessary? Assume the QW075A1  
module is operating at VI = 54 V and an output current  
of 15 A, maximum ambient air temperature of 40 °C,  
and the heat sink is 1/2 inch. The module is oriented in  
the transverse direction.  
TC  
TS  
TA  
PD  
cs  
sa  
8-1304 (C)  
Solution  
Given: VI = 54 V  
IO = 15 A  
Figure 32. Resistance from Case-to-Sink and  
Sink-to-Ambient  
TA = 40 °C  
TC = 85 °C  
Heat sink = 1/2 inch  
For a managed interface using thermal grease or foils,  
a value of θcs = 0.1 °C/W to 0.3 °C/W is typical. The  
solution for heat sink resistance is:  
Determine PD by using Figure 24:  
PD = 16 W  
(TC – TA)  
θsa =  
– θcs  
------------------------  
Then solve the following equation:  
PD  
This equation assumes that all dissipated power must  
be shed by the heat sink. Depending on the user-  
defined application environment, a more accurate  
model, including heat transfer from the sides and bot-  
tom of the module, can be used.This equation provides  
a conservative estimate for such instances.  
(TC – TA)  
θca =  
------------------------  
PD  
(85 – 40)  
θca =  
-----------------------  
16  
θca = 2.8 °C/W  
EMC Considerations  
Use Figure 26 to determine air velocity for the 1/2 inch  
heat sink.  
For assistance with designing for EMC compliance,  
please refer to the FLTR100V10 data sheet  
(DS99-294EPS).  
The minimum airflow necessary for the QW075A1  
module is 1.2 m/s (240 ft./min.).  
Note: Pending improvement will lower the power dissi-  
pation and reduce the airflow needed.  
Layout Considerations  
Copper paths must not be routed beneath the power  
module mounting inserts. For additional layout guide-  
lines, refer to the FLTR100V10 data sheet  
(DS99-294EPS).  
Lucent Technologies Inc.  
15  
 
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Data Sheet  
May 2000  
Outline Diagram  
Dimensions are in millimeters and (inches).  
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.)  
x.xx mm ± 0.25 mm (x.xxx in. ± 0.010 in.)  
Top View  
36.8  
(1.45)  
57.9  
(2.28)  
Side View  
12.7  
(0.50)  
SIDE LABEL*  
0.51  
(0.020)  
4.1 (0.16) MIN, 2 PLACES  
4.1 (0.16) MIN,  
6 PLACES  
3.5 (0.14) MIN  
1.57 (0.062) DIA  
1.02 (0.040) DIA  
SOLDER-PLATED  
BRASS, 6 PLACES  
SOLDER-PLATED  
BRASS, 2 PLACES  
Bottom View  
RIVETED CASE PIN (OPTIONAL)  
1.09 x 0.76 (0.043 x 0.030)  
3.6  
(0.14)  
50.80  
(2.000)  
5.3  
(0.21)  
MOUNTING INSERTS  
12.7  
11.2  
10.9  
(0.43)  
(0.50)  
(0.44)  
M3 x 0.5 THROUGH,  
4 PLACES  
3.81  
(0.150)  
11.43  
(0.450)  
VO(–)  
VI(–)  
7.62  
(0.300)  
– SENSE  
TRIM  
15.24  
(0.600)  
15.24  
(0.600)  
ON/OFF  
26.16  
+ SENSE  
VO(+)  
(1.030)  
VI(+)  
7.62  
(0.300)  
47.2  
(1.86)  
5.3  
(0.21)  
8-1769 (F).b  
* Side label includes Lucent logo, product designation, safety agency markings, input/output voltage and current ratings, and bar code.  
16  
Lucent Technologies Inc.  
Data Sheet  
May 2000  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Recommended Hole Pattern  
Component-side footprint.  
Dimensions are in millimeters and (inches).  
5.3  
(0.21)  
47.2  
(1.86)  
7.62  
(0.300)  
VI(+)  
26.16  
(1.030)  
VO(+)  
+ SENSE  
15.24  
15.24  
TRIM  
ON/OFF  
7.62  
(0.600)  
(0.600)  
– SENSE  
(0.300)  
VI(–)  
VO(–)  
11.43  
(0.450)  
3.81  
(0.150)  
MOUNTING INSERTS  
M3 x 0.5 THROUGH,  
4 PLACES  
10.9  
(0.43)  
11.2  
(0.44)  
12.7  
(0.50)  
5.3  
(0.21)  
50.80  
(2.000)  
3.6  
(0.14)  
CASE PIN (OPTIONAL)  
8-1769 (F).b  
Ordering Information  
Table 4. Device Codes  
Input  
Voltage  
Output  
Voltage  
Output  
Power  
Remote On/Off  
Logic  
Device  
Code  
Comcode  
48 V  
48 V  
5 V  
50 W  
75 W  
Negative  
Negative  
QW050A1  
QW075A1  
108153669  
107967218  
5 V  
Optional features can be ordered using the suffixes shown in Table 5.The suffixes follow the last letter of the device  
code and are placed in descending order. For example, the device codes for a QW050A1 module with the following  
options are shown below:  
Auto-restart after overcurrent shutdown  
QW050A41  
Table 5. Device Options  
Option  
Suffix  
Auto-restart after overcurrent shutdown  
4
Lucent Technologies Inc.  
17  
 
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Data Sheet  
May 2000  
Ordering Information (continued)  
Table 6. Device Accessories  
Accessory  
Comcode  
1/4 in. transverse kit (heat sink, thermal pad, and screws)  
1/4 in. longitudinal kit (heat sink, thermal pad, and screws)  
1/2 in. transverse kit (heat sink, thermal pad, and screws)  
1/2 in. longitudinal kit (heat sink, thermal pad, and screws)  
1 in. transverse kit (heat sink, thermal pad, and screws)  
1 in. longitudinal kit (heat sink, thermal pad, and screws)  
848060992  
848061008  
848061016  
848061024  
848061032  
848061040  
Dimensions are in millimeters and (inches).  
1/4 IN.  
1/4 IN.  
1.450 ± 0.015  
(36.83 ± 0.38)  
1/2 IN.  
1 IN.  
1/2 IN.  
1 IN.  
2.280 ± 0.015  
(57.91 ± 0.38)  
1.850 ± 0.005  
(47.24 ± 0.13)  
1.030 ± 0.005  
(26.16 ± 0.13)  
8-2473 (F)  
8-2472 (F)  
Figure 33. Longitudinal Heat Sink  
Figure 34. Transverse Heat Sink  
18  
Lucent Technologies Inc.  
Data Sheet  
May 2000  
QW050A1 and QW075A1 Power Modules:  
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W  
Notes  
Lucent Technologies Inc.  
19  
For additional information, contact your Lucent Technologies Account Manager or the following:  
POWER SYSTEMS UNIT: Network Products Group, Lucent Technologies Inc., 3000 Skyline Drive, Mesquite, TX 75149, USA  
+1-800-526-7819 (Outside U.S.A.: +1-972-284-2626, FAX +1-888-315-5182) (product-related questions or technical assistance)  
http://www.lucent.com/networks/power  
techsupport1@lucent.com  
INTERNET:  
E-MAIL:  
ASIA PACIFIC:  
Lucent Technologies Singapore Pte. Ltd., 750D Chai Chee Road #07-06, Chai Chee Industrial Park, Singapore 469004  
Tel. (65) 240 8041, FAX (65) 240 8438  
CHINA:  
JAPAN:  
Lucent Technologies (China) Co. Ltd., SCITECH Place No. 22 Jian Guo Man Wai Avenue, Beijing 100004, PRC  
Tel. (86) 10-6522 5566 ext. 4187, FAX (86) 10-6512 3694  
Lucent Technologies Japan Ltd., Mori Building No. 21, 4-33, Roppongi 1-chome, Minato-ku, Tokyo 106-8508, Japan  
Tel. (81) 3 5561 5831, FAX (81) 3 5561 1616  
LATIN AMERICA: Lucent Technologies Inc., Room 416, 2333 Ponce de Leon Blvd., Coral Gables, FL 33134, USA  
Tel. +1-305-569-4722, FAX +1-305-569-3820  
EUROPE:  
Technical Inquiries: GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Ascot),  
FRANCE: (33) 1 40 83 68 00 (Paris), SWEDEN: (46) 8 594 607 00 (Stockholm),  
FINLAND: (358) 9 4354 2800 (Helsinki), ITALY: (39) 02 6608131 (Milan), SPAIN: (34) 91 807 1441 (Madrid)  
Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No  
rights under any patent accompany the sale of any such product(s) or information.  
Copyright © 2000 Lucent Technologies Inc.  
All Rights Reserved  
Printed in U.S.A.  
May 2000  
DS00-178EPS (Replaces DS99-029EPS)  
Printed On  
Recycled Paper  
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LINEAGEPOWER

 		QW010A0A1Z 36伏至75伏直流输入; 1.2 Vdc至5.0 Vdc输出; 10 A至20 A[ 36 Vdc to 75 Vdc Input; 1.2 Vdc to 5.0 Vdc Output; 10 A to 20 A ] 24 页

LINEAGEPOWER

 		QW015A0F 36伏至75伏直流输入; 1.2 Vdc至5.0 Vdc输出; 10 A至20 A[ 36 Vdc to 75 Vdc Input; 1.2 Vdc to 5.0 Vdc Output; 10 A to 20 A ] 24 页

LINEAGEPOWER

 		QW015A0F-H 36 - 75VDC输入; 1.0VDC至5V直流输出; 10A至20A输出电流[ 36 - 75Vdc Input; 1.0Vdc to 5Vdc Output; 10A to 20A Output current ] 5 页

LINEAGEPOWER

 		QW015A0F1 36伏至75伏直流输入; 1.2 Vdc至5.0 Vdc输出; 10 A至20 A[ 36 Vdc to 75 Vdc Input; 1.2 Vdc to 5.0 Vdc Output; 10 A to 20 A ] 24 页

LINEAGEPOWER

 		QW015A0F1-SZ 36伏至75伏直流输入; 1.2 Vdc至5.0 Vdc输出; 10 A至20 A[ 36 Vdc to 75 Vdc Input; 1.2 Vdc to 5.0 Vdc Output; 10 A to 20 A ] 24 页

LINEAGEPOWER

 		QW015A0F1Z 36伏至75伏直流输入; 1.2 Vdc至5.0 Vdc输出; 10 A至20 A[ 36 Vdc to 75 Vdc Input; 1.2 Vdc to 5.0 Vdc Output; 10 A to 20 A ] 24 页

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