smallembedded

Low-voltage side current detection based on TS507

STEVAL-ISQ013V1

Overview

Current sensing is very useful for protecting applications. The STEVAL-ISQ013V1 demonstration board implements a low-side current sensing which consists in placing a sense resistor between the load and the circuit ground and the resulting voltage drop is amplified using a TS507 op amp.

The common mode voltage is close to ground, whatever the voltage of the power source, so the current sense voltage can be amplified by this low voltage op amp without any restrictions.
The circuit offers very stable electrical characteristics over the entire supply voltage range and is particularly intended for automotive and industrial applications.

Main features

Ultra low offset voltage: 25 μV typ, 100 μV max
Rail-to-rail input/output voltage swing
Operating from 2.7 V to 5.5 V
High speed: 1.9 MHz
45° phase margin with 100 pF
Low consumption: 0.8 mA at 2.7 V

Very large signal voltage gain: 131 dB
High power supply rejection ratio: 105 dB
Very high ESD protection 5 kV (HBM)
Latch-up immunity
RoHS compliant

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-03 04:18:55

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