TLE7183QU Datasheet, PDF (20/28 Pages) Infineon Technologies AG – 3 Phase Driver IC Automotive Power

TLE7183QU
5.3
Shunt Signal Conditioning
The TLE7183QU incorporates a fast and precise operational amplifier for conditioning and amplification of the
current sense shunt signal. A reference bias buffer is integrated to provide an adjustable bias reference for the
three OpAmps. The voltage divider connected to the VRI pin should be less than 50 kOhm. If required at all, the
filtering capacitor should be less than 1.2 µF. The gain of the OpAmp can be adjusted by external resistors within
a range of 5 to 15.
If V(ISP) equals V(ISN), VO provides the reference voltage VRO. Using a voltage divider VRO is usually set to half
of the regulated voltage to allow bi-directional current sensing. The additional buffer permits the adaptation of the
reference bias to different µC I/O voltages.
The output of the I-DC link Opamp VO is not short-circuit proof.
TLE7183QU
to Error
logic
blanking
overcurrent _time
1.5µs
OC
Comp
+ _Bias
Reference
-
I-DC Link
OpAmp
R_VRI
VRI
R_VRI
VRO
5V
C_VRI
R_fb
ISP
R_s
R_s
ISN
R_fb
5V
R_shunt
VTHOC
VO
to ADC
Figure 4 Shunt Signal Conditioning Block Diagram and Overcurrent Limitation
For overcurrent warning, please see Chapter 5.2.2.
adjustable
overcurrent
limit
Data Sheet
20
Rev. 1.1, 2016-01-28