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WT7062

型号：

WT7062

描述：

5V的3相无传感器风扇电机驱动器[ 5V 3-phase sensor-less fan motor driver ]

品牌：

WELTREND[ WELTREND SEMICONDUCTOR ]

页数：

16 页

PDF大小：

502 K

下载PDF手册
偉詮電子股份有限公司  
Weltrend Semiconductor, Inc.  
WT7062  
3-Phase Sensorless Motor Driver  
Data Sheet  
REV. 0.05  
March 4, 2011  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page i  
WT7062  
3-Phase Brushless Sensorless DC Motor Driver  
Revision History  
Version  
Content  
Date  
0.01  
First released  
August 3, 2010  
1. Added pin description and DFN-10 outline drawing  
2. Modified Supply current  
0.02  
0.03  
August 24, 2010  
1. Added DFN10 Theta Ja, Jc, Tjmax, Pdmax  
2. Modified MSOP10 Theta Ja, Jc, Tjmax, Pdmax  
3. Modified PWM VPWML, VPWMH  
4. Modified LDT, LRT  
September 16, 2010  
1. Described FR function and Added LHT, LRT  
2. Modified LDT, LRT  
0.04  
0.05  
December 14, 2010  
March 4, 2011  
1. Added FIL Pin and modify Application circuit  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2010  
Rev. 0.05  
Page ii  
WT7062  
3-Phase Brushless Sensorless DC Motor Driver  
ꢀ Generation Description  
The WT7062 is 3-phase full-wave drivers for brushless sensorless DC motors. It features 150°  
square drive, high torque output, and silent drive. Speed control can be achieved through either  
power supply modulation or pulse-width-modulation (using the PWM digital input pin).  
Due to the compact packaging and minimum bill-of-material (power transistors incorporated, no  
Hall sensor, no external tuning), they are best suited for low-cost fan applications requiring high  
efficiency and low acoustic noise, such as notebook cooling fans.  
Frequency generator output is also included (FG). The WT7062 driver includes a lockup protection  
mode, which turns-off the output current when the motor is under lock condition, and an automatic  
recovery that enables the fan to release when the lock condition is removed. Thermal-shutdown  
protection is also included. They are available in a compact thermally-enhanced MSOP10  
package.  
ꢀ
Features  
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Position sensorless BLDC drivers (no Hall sensor required)  
150°square drive, for high efficiency and low acoustic noise  
Support 2.0V to 5.5V power supplies  
Speed control through PAM or PWM  
Built-in frequency generator (FG output signal)  
Built-in lockup protection and automatic recovery circuit (external capacitors not necessary)  
Built-in thermal shutdown protection  
MSOP-10 & DFN-10 package  
No external tuning required  
Weltrend reserves the right to change this documentation without prior notice. Information provided by Weltrend is believed to be accurate and  
reliable. However, Weltrend makes no warranty for any errors which may appear in this document. Contact Weltrend to obtain the latest version of  
device specifications before placing your order. No responsibility is assumed by Weltrend for any infringement of patent or other rights of third parties  
which may result from its use. In addition, Weltrend products are not authorized for use as critical components in life support devices/ systems or  
aviation devices/systems, where a malfunction or failure of the product may reasonably be expected to result in significant injury to the user, without  
the express written approval of Weltrend  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page i  
ꢀ
Block Diagram  
PWM  
FG  
U V W  
10  
1
FIL  
COM  
9
2
VREF  
CMP  
OSC  
TSD  
Controller  
Logic  
FR  
VSS  
3
8
Pre-Driver  
VCC  
V
4
7
U
W
5
6
Figure 1: block diagram  
ꢀ
Pin Assignments  
FG  
1
10 PWM  
1
2
3
4
5
10  
9
FG  
PWM  
FIL  
VSS  
V
COM  
FR  
2
3
4
5
9
8
7
6
FIL  
VSS  
V
COM  
FR  
8
VCC  
U
7
VCC  
U
W
6
W
Figure 2: DFN-10 & MSOP-10 pin assignments  
ꢀ
Pin Description  
Pin No.  
Pin name  
Function  
Equivalent circuit  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 2  
VCC  
1
FG  
FG pulse output.  
VCC  
2
VCOM  
Motor middle point connection.  
VCC  
3
FR  
Motor rotation direction  
switching. A low level input  
(0~0.3Vcc) causes forward  
rotation. A middle level input  
(0.3Vcc~0.7cc) makes the  
motor locked. And a high level  
input (0.7Vcc~Vcc) causes  
reverse rotation.  
500Ω  
20kΩ  
4
5
VCC  
U
Power supply  
VCC  
Output pin.  
Connect the motor coil.  
6
7
W
V
V
W
U
8
9
GND  
FIL  
Ground for IC  
VCC  
Motor position detection filter  
pin. Connect a capacitor  
between this pin and the  
VCOM pin.  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 3  
VCC  
10  
PWM  
PWM signal input. The motor  
speed is controlled by the input  
PWM duty cycle setting.  
8kΩ  
500Ω  
ꢀ
Pin Functions  
Pin #  
Pin Name  
FG  
Pin Description  
Motor speed indication output (open drain)  
1
2
COM  
FR  
Motor middle point terminal  
Motor rotation direction switching  
Power Supply for the IC and motor  
U phase output terminal  
3
VCC  
U
4
5
W
W phase output terminal  
6
V
V phase output terminal  
7
VSS  
FIL  
PWM  
Ground terminal  
8
Motor position detection filter pin  
PWM input signal for speed control  
9
10  
Figure 4: MSOP-10/DFN-10 pin assignments  
ꢀ
Functional Description  
The WT7062 generates signals to drive a 3-phase sensorless BLDC motor. High efficiency and  
low-power consumption are achieved due to synchronous rectification drive type. The current carrying  
order of the outputs is as follows: U phase -> V phase -> W phase.  
ꢀ
Speed Control  
The rotational speed of the motor can be controlled either through the PWM digital input  
signal or by acting directly on the power supply (VCC). When the PWM signal is “High” (or  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 4  
left open) the motor rotates at full speed. When the PWM signal is “Low” the motor is  
stopped (and the IC outputs are set to high-impedance). By changing the PWM duty cycle,  
the speed can be adjusted. Notice that the PWM frequency has no special meaning for the  
motor speed and is asynchronous with the activation of the output transistors. Thus the user  
has maximum freedom to choose the PWM system frequency within a wide range (from  
20KHz to 50kHz)  
ꢀ
ꢀ
Frequency Generator Function  
The Frequency Generator output (FG) is a “Hall-sensor equivalent” digital output, giving  
information to an external controller about the speed and phase of the motor. When a lock  
(or out-of-sync) situation is detected by the driver, this output is set to “Low” until the motor is  
restarted. The FG pin is an open collector output, connecting to a logical voltage level  
through an external pull-up resistor. Leave the pin open when not used.  
Lockup Protection and Automatic Restart  
If the motor is stopped (blocked) or if it loses synchronization with the driver, a lock-up  
protection circuit detects this situation and disables the driver (by setting its outputs to  
high-impedance) in order to prevent the motor coil from burnout. After a "release time" (LRT),  
the lock-up protection is released and normal operation resumes for a given time (LDT). In  
case of the motor is still blocked, a new period of waiting time is started. LRT and LDT  
timings are fixed internally, so that no external capacitor is needed.  
Figure 4 Lock and FG timing charts  
ꢀ
Thermal Shutdown  
The WT7062 has a thermal protection function which detects when the die temperature  
exceeds Tj=150°C. When this temperature is reached, the circuit enters the thermal  
shutdown mode and the outputs U phase, V phase and W phase are disabled (high  
impedance), avoiding IC destruction and allowing the circuit to cool down. Once the junction  
temperature (TJ) has dropped below 120°C, the normal operation resumes (thermal  
detection circuit has 30°C hysteresis function).  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 5  
Figure 5 Thermal protection hysteresis  
ꢀ
ꢀ
Positional Detection Filter  
The positional detection problems caused by a comparator input noise is improvable by  
connecting a capacitor (0.1uF) between the VCOM and the FIL pin.  
U,V,W phase and FG output signals  
The timing charts of the output signals from the U, V and W phases as well as the FG  
terminal are shown as below. Assuming that a three-slot tetrode motor is used, two pulse  
outputs of FG are produced for one motor cycle. The three phases are excited in the order of  
U, V and W phases.  
U phase  
voltage  
V phase  
voltage  
W phase  
voltage  
FG  
Figure 6: U, V, W and FG timing charts  
ꢀ
FR function  
FR pin is the motor rotational direction switching pin.  
Low level voltage input ： U → V → W,  
High level voltage input ： U → W → V  
Perform a current – carrying to the motor in above order. The motor is revolving in the other  
direction by exchanging the current – carrying order.  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 6  
Forward  
Stop  
Float  
Backward  
Induced electromotive  
voltage detection  
FHT  
FRT  
FR  
FG  
Figure 7: FR and FG timing charts  
FR  
3
FR1  
FR2  
0.7Vcc  
5KO  
0.3Vcc  
0.7VCC  
0.3VCC  
FR  
FR1  
FR2  
Stop  
(V-PMOS, W-NMOS Turn-on)  
Stop  
(V-PMOS, U-NMOS Turn-on)  
Forward  
Floating  
FRT  
Reverse  
Floating  
Reverse  
LHT  
LHT  
FRT  
When the motor is running Forward (FR<0.3Vcc) or Reverse (FR>0.7Vcc) , if FR goes  
to the voltage between 0.3Vcc to 0.7Vcc, WT7062 will deliver a stop signal to hold the motor.  
When the motor is hold (0.3Vcc < FR < 0.7Vcc), if FR goes to the voltage less than 0.3Vcc or  
larger than 0.7Vcc, WT7062 will let the motor float for 1 Sec and then back to the forward or  
reverse mode.  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 7  
ꢀ
ELECTRICAL SPECIFICATIONS  
ꢀ
Absolute maximum ratings at Ta= 25℃  
Parameter  
Power Supply Voltage  
Output pin current  
PWM input pin voltage  
FG output pin voltage  
FG output pin current  
Allowable Power Dissipation 1  
Allowable Power Dissipation 2  
Operating Temperature  
Storage Temperature  
Symbol  
Ratings  
6.5  
600*  
Unit  
V
Conditions  
Vcc max  
Iout max  
VPWM max  
VFG max  
IFG max  
Pd max 1  
Pd max 2  
Topr  
mA  
V
6.5  
6.5  
V
5
600  
683  
-30 ~ +95  
-40 ~ +150  
mA  
mW  
mW  
℃
MSOP10  
DFN10  
Tstg  
℃
* This value is not to exceed Pd  
ꢀ
Recommended operating conditions  
Parameter  
Symbol  
VCC  
Limit  
Unit  
Operating supply voltage range  
2 ~ 5.5  
V
ꢀ
Electrical Characteristic(Vcc=5V,Ta=25℃unless otherwise noted)  
Parameter  
Symbol  
Ratings  
Typ  
Unit  
Conditions  
Min  
1
1.2  
0.5  
2.5  
0
Max  
1.5  
1.5  
Supply current (standby current)  
Source + Sink  
Output voltage  
PWM pin high-level input voltage  
PWM pin low-level input voltage  
PWM input frequency  
Icc  
on(H+L)  
mA PWM=GND  
ꢀ
V
V
V
kHz  
V
s
R
Iout =0.5A,  
Iout =0.5A,  
VO  
0.75  
Vcc  
0.6  
50  
0.4  
VPWMH  
-
-
VPWML  
Fpwm  
VFGL  
LDT  
LRT  
TSD  
20  
FG low voltage  
0.2  
0.64  
3.2  
IFG=5mA  
VDD=5V  
Lock protection detection time  
Lock protection release time  
Thermal protection temperature  
Thermal protection hysteresis  
FR pin high-level input voltage  
FR pin low-level input voltage  
FR hold time  
1
5
150  
30  
-
-
1
1
1.42  
7.11  
s
℃
℃
V
V
s
∆TSD  
VFRH  
3.5  
0
0.64  
0.64  
5
1.5  
Reverse  
Forward  
Stop  
VFRL  
FHT  
FRT  
FR release time  
1.42  
s
Float  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 8  
ꢀ
Application Notes  
PWM  
FG  
U V W  
PWM  
10  
FG  
1
FIL  
COM  
9
2
VREF  
CMP  
C2  
0.1uF  
C4 330pF  
C3 330pF  
OSC  
TSD  
Controller  
Logic  
FR  
VSS  
3
8
FR  
Pre-Driver  
VCC  
V
4
7
VCC  
C1 1uF  
U
W
5
6
ꢀ
Package Outlines  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 9  
Package: 10-Lead MSOP (3x5x1.1mm)  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 10  
Package: 10-pin DFN (3x3x0.5mm)  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 11  
ꢀ
Carrier Tape & Reel Dimensions  
Package: 10-Lead MSOP  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 12  
Package: 10-pin DFN  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 13  
ꢀ
Ordering Information  
Part Number  
Package Type  
10-Pin MSOP, Green Package  
Transport Media  
Tape & Reel  
Quantity  
2,500  
WT7062-MG100  
WT7062-VG100  
10-Pin DFN, Green Package  
Tape & Reel  
2,500  
ꢀ
Thermal De-rating Curve  
MSOP10  
700  
600  
500  
400  
300  
200  
100  
95  
Ambient Temperature, Ta –°C  
0
25  
50  
75  
125  
150  
*70mm × 70mm × 1.6mm single layer board.  
*ΘJa=208 ℃/W, ΘJc= 48 ℃/W, Tj max= 150℃, Pd max 600mW.  
DFN10  
683  
600  
500  
400  
300  
200  
100  
95  
Ambient Temperature, Ta –°C  
0
25  
50  
75  
125  
150  
*70mm x 70mm x 1.6mm single layer board.  
*ΘJa=182.9 ℃/W, ΘJc= 33.6 ℃/W, Tj max= 150℃, Pd max 683mW.  
Weltrend Semiconductor, Inc.  
Proprietary & Confidential  
Mar. 4, 2011  
Rev. 0.05  
Page 14  
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