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XTR501

型号：

XTR501

描述：

大电流桥驱动器和4-20mA发送器[ HIGH CURRENT BRIDGE DRIVER and 4-20mA Transmitter ]

品牌：

BB[ BURR-BROWN CORPORATION ]

页数：

7 页

PDF大小：

54 K

下载PDF手册
®
XTR501  
HIGH CURRENT BRIDGE DRIVER  
and 4-20mA Transmitter  
DESCRIPTION  
FEATURES  
The XTR501 contains a high efficiency DC/DC con-  
verter and 4-20mA three wire current transmitter. It  
provides regulated bridge excitation, optional half  
bridge, differential inputs and current transmitter nec-  
essary for the excitation and signal conditioning of  
low impedance bridge sensors and high integrity sig-  
nal transmission.  
● SENSOR EXCITATION OF 1W  
● VARIABLE EXCITATION VOLTAGE:  
1.5V to 5.0V  
● SINGLE SUPPLY: 11.4V to 30VDC  
● INRUSH CURRENT LIMITING  
● 4-20mA TRANSMITTER  
The DC/DC converter is capable of supplying 1W into  
a regulated bridge voltage of 1.5V to 5.0V from a  
supply of 11.4V to 30V. The combination of a low  
startup current and high efficiency current step-up  
allows for a combined supply line resistance of up to  
100Ω when exciting low impedance sensors.  
APPLICATIONS  
● GAS DETECTION SENSORS  
● PELLISTOR CATALYTIC DETECTORS  
● STRAIN GAGES  
The instrumentation amplifier of the current transmit-  
ter can be used over a wide range of gains, accommo-  
dating a variety of input signals and sensors.  
● HIGH CURRENT BRIDGES  
● LOAD CELLS  
● HOT-WIRE ANEMOMETERS  
The XTR501 is particularly suited to excitation of  
high current/low impedance sensors used in bridge  
applications allowing the use of lighter cabling lead-  
ing to considerable savings on cabling costs.  
RSPAN  
+24V  
GA  
GB  
Long Cables  
+VS  
XTR501  
+VIN  
–VIN  
IOUT  
4-20mA  
VBB  
+VB  
VOUT  
RSENSE  
DC/DC  
Com  
SET  
VB  
RSET  
International Airport Industrial Park  
•
Mailing Address: PO Box 11400  
Cable: BBRCORP  
•
Tucson, AZ 85734  
•
Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706  
Tel: (520) 746-1111 Twx: 910-952-1111  
•
•
•
Telex: 066-6491  
•
FAX: (520) 889-1510  
•
Immediate Product Info: (800) 548-6132  
©1994 Burr-Brown Corporation  
PDS-1212  
Printed in U.S.A. October, 1994  
SPECIFICATIONS  
ELECTRICAL  
TA = +25°C, VS = 24V, VBRIDGE = 2V, ILOAD = 300mA unless otherwise specified.  
XTR501  
TYP  
PARAMETER  
CONDITIONS  
MIN  
MAX  
UNITS  
INSTRUMENTATION AMPLIFIER/CURRENT TRANSMITTER  
SIGNAL OUTPUT  
Output Current Equation  
Output Current  
RG in Ω, VIN in V  
Linear Operating Range  
IO = 0.004 + 0.016 [(1 + 50kΩ/RG)/4.94] VIN  
A
4
20  
mA  
mA  
mA  
Over-scale Limit  
Under-scale Limit  
25  
27  
0
ZERO  
Output Current  
Offset Error  
vs Temperature  
vs Supply Voltage  
4
mA  
µA  
µA/°C  
µA/V  
±50  
0.2  
0.5  
±100  
VS = 11.4V to 30V  
2
SPAN  
Span Equation  
Untrimmed Error  
RG in Ω,VIN in V  
G = 1  
Span = 0.016[(1 + 50kΩ/RG)/4.94]  
A/V  
%
%
ppm/°C  
%
±0.2  
±1.5  
50  
±2.5  
±10  
G = 250  
vs Temperature  
Nonlinearity  
G = 1, IO = 4mA to 20mA  
±0.025  
INPUT  
Common-Mode Range  
Offset Voltage  
0
4.94(1)  
V
mV  
16  
50  
vs Temperature  
µV/°C  
dB  
vs Supply Voltage  
75  
Common-Mode Rejection  
Impedance; Differential, Common-Mode  
85  
1010 || 6  
dB  
Ω || pF  
DC/DC CONVERTER  
BRIDGE EXCITATION VOLTAGE SOURCE  
Output Voltage  
vs Temperature  
vs Long Term Stability  
Output Power  
1.5  
5
1
V
VIN = 0V, G= 1  
200  
100  
ppm/°C  
ppm/1000hrs  
W
%
%
Line Voltage Regulation  
Load Voltage Regulation  
VS = 11.4V to 30.0V  
Load Current 160mA to 340mA  
Load Voltage 2V  
0.25  
0.25  
Output Voltage Ripple  
Load Current 300mA  
Load Voltage 2V  
150  
mV  
Output Voltage Ripple Frequency  
Output Short-Circuit Current  
Input Current  
100  
2.6  
150  
kHz  
A
mA  
Limited Duration  
Output Short-Circuit  
POWER SUPPLY  
Supply Voltage, VS  
Supply Current  
11.4  
24  
30  
V
See Typical Curve  
TEMPERATURE  
Operating  
Storage  
–40  
–40  
+70  
+85  
°C  
°C  
NOTE: (1) Common-Mode Range is based on a multiple of a bandgap reference of 1.235V.  
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes  
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change  
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant  
any BURR-BROWN product for use in life support devices and/or systems.  
®
XTR501  
2
ABSOLUTE MAXIMUM RATINGS  
ORDERING INFORMATION  
TEMPERATURE  
RANGE  
Supply Voltage, VS ............................................................................... 30V  
Input Voltage ....................................................................................... 10V  
Output Power ........................................................................................ 1W  
Operating Temperature Range ............................................. 0°C to +70°C  
Storage Temperature Range ............................................ –40°C to +85°C  
MODEL  
XTR501  
PACKAGE  
24-Pin Plastic Module  
–40°C to +70°C  
PACKAGE INFORMATION  
PACKAGE DRAWING  
NUMBER(1)  
PIN CONFIGURATION  
MODEL  
XTR501  
PACKAGE  
Top View  
24-Pin Plastic Module  
902  
NOTE: (1) For detailed drawing and dimension table, please see end of data  
sheet, or Appendix D of Burr-Brown IC Data Book.  
SET  
SET  
1
2
3
24 GA  
23 GA  
GB  
PIN DESCRIPTION  
SENSE  
SENSE  
GB  
PIN  
NAME  
DESCRIPTION  
–VIN  
22 +VIN  
SET  
1
2
3
GB  
Connect to RSPAN to set transconductance.  
SENSE  
SET  
SET  
GB  
Sense pin for GB  
connect to GA  
.
–VIN  
IOUT  
Inverting input to transmitter.  
10  
Output Current connect through RSENSE to  
common.  
XTR501  
11  
12  
Common  
VS  
Supply return for sense and VB connectors.  
Supply to XTR501 +11.4V to 30.0V.  
VBB  
–VB  
+VB  
+VB  
18  
17  
16  
15  
14  
SET  
14  
VB  
Single resistor to common sets the bridge  
excitation voltage.  
SENSE  
15  
+VB  
Positive bridge sense input connect to positive  
excitation voltage at bridge.  
SENSE  
10  
11  
12  
IOUT  
16  
17  
18  
+VB  
–VB  
VBB  
Positive bridge excitation voltage.  
Negative bridge excitation voltage.  
SET  
VB  
Common  
VS  
Output from internal half bridge connect to –VIN  
.
22  
23  
24  
+VIN  
Non-Inverting input to transmitter.  
Sense pin for GASET connect to GA  
SENSE  
SET  
GA  
.
SET  
GA  
Connect to RSPAN to set transconductance.  
®
3
XTR501  
TYPICAL PERFORMANCE CURVES  
TA = +25°C, VS = 24V, VBRIDGE = 2V, ILOAD = 300mA unless otherwise specified.  
NON-LINEARITY (Low Gain)  
25  
NON-LINEARITY (High Gain)  
25  
20  
20  
VBRIDGE = 2.0V, ILOAD = 300mA, VS = 24V  
VBRIDGE = 2.0V, ILOAD = 300mA, VS = 24V  
15  
10  
15  
10  
5
5
0
0
–5  
–5  
–10  
–15  
–20  
–25  
–10  
–15  
–20  
–25  
0
5
10  
15  
20  
25  
30  
0
1
2
3
4
5
VIN (mV)  
V
IN (V)  
SMALL SIGNAL TRANSIENT RESPONSE  
RLOAD = 250Ω  
LARGE SIGNAL TRANSIENT RESPONSE  
RLOAD = 250Ω  
VIN  
IO  
IO  
VIN  
IO = 4-20mA, VIN = 27mV  
IO = 4-20mA, VIN = 5V  
5ms/Div  
2ms/Div  
OUTPUT NOISE  
NOTES: IO into 250Ω.  
FFT of OUTPUT NOISE  
(1) No smoothing. (2) 5µF capacitor across 250Ω.  
310kHz  
(1)  
(2)  
1µs/Div  
100kHz/Div  
®
XTR501  
4
TYPICAL PERFORMANCE CURVES (CONT)  
TA = +25°C, VS = 24V, VBRIDGE = 2V, ILOAD = 300mA unless otherwise specified.  
ZERO CURRENT TC (µA/°C)  
MAXIMUM CURRENT LOOP RESISTANCE  
20  
15  
10  
5
30  
20  
10  
0
Operating point must  
be within this region  
Example:  
24V Supply  
RMAX = 700Ω  
0
0
0.05  
0.1  
0.15  
0.2  
0.25  
300  
400  
500  
600  
700  
800  
900  
Zero Current Drift (µA/°C)  
Average = 0.100µA/°C  
3σ = 0.115µA/°C  
Resistance (Ω)  
UNTRIMMED ERROR TC G = 1 (ppm/°C)  
BRIDGE VOLTAGE LINE REGULATION  
14  
12  
10  
8
0.1  
0.08  
0.06  
0.04  
0.02  
0
VBRIDGE = 2.0V, ILOAD = 300mA, VS = 12V - 30V  
6
4
2
–0.02  
–0.04  
0
12  
18  
24  
30  
0
10  
20  
30  
40  
50  
VS (V)  
Untrimmed Error TC Drift (ppm/°C)  
Average = 21ppm/°C  
3σ = 25ppm/°C  
BRIDGE VOLTAGE REGULATION vs TEMPERATURE  
VBRIDGE = 2.0V, ILOAD = 300mA, VS = 24V  
BRIDGE VOLTAGE LOAD REGULATION  
VBRIDGE = 2.0V, VS = 24V  
0.05  
0.04  
0.03  
0.02  
0.01  
0
0.1  
0
0.1  
0.2  
0.3  
0.4  
0.5  
0.6  
–0.01  
–0.02  
–0.03  
–40  
–10  
25  
55  
85  
0.06  
0.12  
0.18  
0.24  
Temperature (°C)  
Output Current (A)  
®
5
XTR501  
TYPICAL PERFORMANCE CURVES (CONT)  
TA = +25°C, VS = 24V, VBRIDGE = 2V, ILOAD = 300mA unless otherwise specified.  
SUPPLY CURRENT vs EXCITATION LOAD CURRENT  
Bridge Voltage (VEX) = 2.0V  
BRIDGE EXCITATION VOLTAGE TC (ppm/°C)  
110  
100  
90  
80  
70  
60  
50  
40  
30  
20  
16  
14  
12  
10  
8
6
4
2
0
0
100  
200  
300  
400  
500  
0
30  
60  
90  
120  
150  
I
LOAD (mA)  
Bridge Excitation Voltage Temperature Drift (ppm/°C)  
Average = 70ppm/°C  
3σ = 70ppm/°C  
METHOD OF OPERATION  
APPLICATIONS  
The XTR501 consists of a high efficiency DC/DC converter  
with current and voltage mode control and a current loop  
transmitter.  
The XTR501 is designed to be used with a wide range of  
pellistor catalytic gas detectors. The pellistor gas detector  
consists of a matched pair of elements; an active bead which  
is the sensing element, and an inactive bead which is the  
compensating element. These elements form one side of a  
Wheatstone bridge arrangement. The bridge serves a dual  
purpose: to raise the temperature of the elements to about  
500°C, which is their working temperature, and to allow  
detectionofthepresenceofcombustiblegasesthroughimbal-  
ance of the bridge. This happens as the pellistor increases  
temperature due to oxidation of the flammable gas and thus  
increases its resistance.  
The pulse-width modulation controller monitors the current  
and voltage control signals and varies the conduction period  
to regulate the bridge excitation voltage, VB.  
A soft-start feature is provided to negate problems caused by  
high in-rush currents and lead resistances, thus allowing the  
XTR501 to be driven through cables of up to 100Ω of supply  
line resistance with no reduction in performance.  
A single resistor, RSET, determines the regulated bridge  
excitation voltage which may be in the range 1.5V to 5.0V.  
In general, pellistor catalytic gas detectors are limited in use  
to monitoring up to 100% of the LEL (lower explosive  
limit). Beyond this point ambiguous results can occur due to  
the inability of the pellistor to oxidize the gas as the avail-  
able oxygen decreases (see Figure 3).  
The gain of the transconductance amplifier, which forms the  
current loop transmitter, is again determined by a single  
resistor RSPAN and allows input voltages from 25mV to drive  
the 4-20mA current loop.  
LEL Methane  
Bridge Voltage VEX  
=
=
=
=
=
5% = VIN = 50mV  
2.0V  
21.858kΩ  
4-20mA  
470µH  
RSET  
IO  
RSPAN  
+24V  
12  
VS  
+
XTR501  
10µF  
510Ω  
Tantalum  
24  
16  
15  
+VB  
+VBSENSE  
SET  
GA  
23  
RT  
SENSE  
GA  
100Ω  
Compensator  
10kΩ  
RSPAN  
VBB  
18  
1
V
OUT = IO RLOAD  
SENSE  
SET  
(1)  
GB  
100Ω  
2
IO = 4 to 20mA  
GB  
VOUT  
Detector  
10  
14  
IO  
17  
11  
SET  
1V to 5V  
– VB  
VB  
+
5µF  
Tantalum  
RLOAD  
250Ω  
RSET  
COM  
–VIN  
+VIN  
22  
3
NOTE: (1) VQ 21 Gas Sensor - EEV Gas Sensors.  
FIGURE 1. Basic Connection  
®
XTR501  
6
100  
RT  
100µH  
Compensator  
Detector  
50  
For additional bridge  
smoothing, 100µH  
inductors may be  
inserted as shown.  
Note that inductors  
must be able to handle  
high bridge current.  
100µH  
0
10  
20  
30  
40  
50  
60  
70  
80  
90  
% Methane In Concentration  
FIGURE 3. Typical Pellistor Response.  
FIGURE 2. Bridge Smoothing.  
An interesting feature of pellistor elements, and those tested  
in the applications, is that they create a similar bridge output  
at LEL for almost all hydrocarbons. This feature allows a  
comparative measurement to be made of one gas when an  
instrument has been calibrated for another.  
10  
SENSE  
+VB  
10kΩ  
(a)  
50kΩ  
X
T
R
5
0
1
11  
SET  
+VB  
e.g. Instrument calibrated for Methane (K=112) measuring  
Hydrogen (K=85.8).  
RSET  
Actual % of LEL will be 1.31 x meter reading. (112/85.8).  
This is an approximation and it is recommended that for  
exact conversions the instrument should be calibrated using  
the relevant gases.  
SET  
FIGURE 4. Internal Circuit +VB  
.
Tables of these constants can be sourced through the manu-  
facturers of gas sensing products.  
To Calculate RSPAN  
An example of the XTR501 used with a pellistor catalytic  
gas detector is shown in Figure 1.  
1+ 50kΩ / RSPAN  
IO = 0.004 + 0.016  
VIN  
4.94  
To Calculate RSET  
See Figure 4. Point (a) will be maintained at 1.235V.  
For VIN = 10mV and IO = 20mA  
1.235 50kΩ + R  
(
)
VB –1.235  
SET  
1+ 50kΩ / RSPAN  
=
0.02 = 0.004 + 0.016  
0.01  
10kΩ  
RSET 50kΩ  
4.94  
50kΩ V –1.235  
(
)
50kΩ + RSET  
B
1+ 50kΩ / R  
(
)
0.016  
SPAN  
=
=
10kΩ 1.235  
RSET  
(
) (  
)
0.016 0.01  
) (  
4.94  
(
)
50kΩ  
= 1+  
494 = 1+ 50kΩ / RSPAN  
50kΩ  
RSET  
5 V –1.235  
(
)
–1 =  
50kΩ  
B
RSPAN =  
493  
= 101.4  
1.235  
RSET  
50kΩ 1.235  
) (  
(
)
RSET  
=
5 V −1.235 –1.235  
(
)
B
i.e  
Example:  
4.94  
VIN  
50kΩ  
= 1+  
RSPAN  
VB  
RSET Calculated  
1.5  
2.0  
3.0  
4.0  
5.0  
Open  
21.858kΩ  
7.891kΩ  
4.815kΩ  
3.464kΩ  
50kΩ  
RSPAN  
=
4.94  
–1  
VIN  
®
7
XTR501  
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