STEVAL-ISQ013V1 STMicroelectronics

STEVAL-ISQ013V1 Low-side current sensing demonstration board based on the TS507 Data brief Features Ultra low offset voltage: 25 V typ, 100 V 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 STEVAL-ISQ013V1 RoHS compliant Description 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. August 2010 Doc ID 17851 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Schematic circuit STEVAL-ISQ013V1 1 Schematic circuit Figure 1. Internal schematic P C P C C & N T U N C H N C T - 6 2/4 Doc ID 17851 Rev 1 . F /U . 2F 2G 6C 2S 6 . 6 6C 6O 43 2G 6C 6C 6C . 2F )N