ST AN2727 APPLICATION NOTE

AN2727

Application note

Demonstration board user guidelines for the

TSC101 high-side current sense amplifier

Introduction

This application note describes the DEMO_TSC101, a demonstration board specifically designed for the TSC101 integrated circuit.

In this document, you will find:

●A brief description of the TSC101

●A description of the demonstration board

●A detailed bill of materials of the demonstration board

●The layout of the demonstration board

Figure 1. Demonstration board

June 2008

Rev 1

1/6

www.st.com

About the TSC101	AN2727

1 About the TSC101

The TSC101 measures a very small voltage drop on a high-side shunt resistor, and, using an internally fixed gain, amplifies the difference into a ground-referenced output voltage. The amplification gain is internally fixed and the device is housed in a tiny SOT23-5 package.

Input common-mode and power supply voltages are independent. The common-mode voltage can range from 2.8 V to 30 V in operating conditions, and up to 60 V in absolute maximum ratings. The supply voltage can range from 4 V to 24 V giving you the possibility to connect the power supply pin to either side of the shunt resistor in most cases.

Most of the TSC101 parameters are guaranteed over the full operating temperature range from -40° C to 125° C.

Current consumption of less than 300 µA over the temperature range and low input bias current (less than 8 µA in standard conditions, a few 100 nA if VCC isn’t supplied) are particularly interesting to save power in the application.

The TSC101 key features are:

●Independent supply and input common-mode voltages

●Wide common-mode operating range: 2.8 V to 30 V

●Wide common-mode surviving range: -0.3 V to 60 V (load-dump)

●Wide supply voltage range: 4 V to 24 V

●Low current consumption: ICC max is 300 µA

●Internally fixed gain: 20 V/V (TSC101A), 50 V/V (TSC101B) or 100 V/V (TSC101C)

●Buffered output

For more detailed information about the TSC101, refer to the datasheet.

Figure 2. Typical application for the TSC101

battery or power

Vsense

Iload

source

2.8V to 30V

Rsense

load

3

4

5V

Vp

Vm

Vreg

5

Vcc

Out

VCC

Gnd

ADC

1

2

Vout

Gnd

TSC101

Microcontroller

Current Sensing

Amplifier

2/6