TLE7183QU

Data Sheet

20

Rev. 1.1, 2016-01-28

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.

Figure 4

Shunt Signal Conditioning Block Diagram and Overcurrent Limitation

For overcurrent warning, please see Chapter 5.2.2.

VRI

VRO

ISP

ISN

-

+

VTHOC

VO

blanking

time

1.5µs

to Error

logic

overcurrent

Bias

Reference

I-DC Link

OpAmp

OC

Comp

5V

5V

adjustable

overcurrent

limit

to ADC

TLE7183QU