AUIR33402S 查看數據表（PDF） - Infineon Technologies
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AUIR33402S Datasheet PDF : 17 Pages
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Automotive Grade
AUIR33402S
Design: basic schematic with micro-processor
The basic circuit is giving all the functionality to drive a motor up to 33A DC. RIfbk set both the level current shutdown and
the current feedback reading scale. The IN signal provides to the AUIR33402S the Pwm duty cycle. D1 is the free
wheeling diode during PWM operation. As the equivalent circuit between Vbat and – Mot is 2 diode in series (the body
diode of the AUIR33402S and D1), the system requires T1, D2, R1 and R2 to sustain the reverse battery.
Recommended connection with reverse battery protection1:
+Bat
C3
C4
IN
I/O
Diag
I/O
RIN
Rpdiag
Ifbk
A/D
RpIfbk
Current shutdown
programming resistor
Gnd
RIfbk
Gnd
C1
100nF
C2
1nF
Vcc
IN
AUIR33402S
CBoot
Output
Ifbk
Gnd
Cboot
100nF
D1
MBR
3045CT
T1
IRF140
4
Vbat
+ Mot
R2
10k
- Mot
GND
D2
12V
Figure 1: Recommended schematic
This is the recommended schematic with an optional reverse battery1. The recommended load is an inductive load. This
part may not be suitable for application conditions other than those specified above. Please contact IR’s Automotive
Technical support for further details on other applications requirement.
DC to 20 kHz operation
The AUIR33402S is able to operate in DC and high speed switching operation. To be able to switch at 20 kHz, a
bootstrap capacitor is used externally. The device integrates the power supply of the bootstrap capacitor. In DC operation,
when the capacitor is discharged, the charge pump maintains the device ON.
1 The reverse battery is optional. Remove T1, D2, R2 and connect –Mot to Gnd to remove the features.
3 www.irf.com
© 2014 International Rectifier
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August 14, 2014
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