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 TSC10 1

● 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 dif ference into a ground-ref erenced o utput volt age. 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 fr om 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 guar anteed over the fu ll 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 V 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: I

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

● Buffered output

max is 300 µA

isn’t supplied) are

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

Figure 2. Typical application for the TSC101

battery or power

source

2.8V to 30V

Vp Vm

Gnd

sense

TSC101

Current Sensing

Amplifier

Vcc

Out

load

out

Gnd

Microcontroller

ADC

reg

2/6

AN2727 Description of the demonstration board

2 Description of the demonstration board

The DEMO_TSC101 is a demonstration board designed to help you evaluate the performance of the TSC101.

Figure 3. Demonstration board schematic diagram

Current_in

1 2

Current_out

TSC101

VCC

OUT

IC1

C1 CAP

1 2 3

CON3

VP VM

Gnd

Table 1. Demonstration board bill of materials

GND

Part Part type Footprint Description Manufacturer Reference

IC1 TSC101B SOT23-5

R1 WSL3637

9.4mm x

9.14mm

High-side current sensing

amplifier

STMicroelectronics TSC101BILT

5mΩ shunt resistor Vishay Dale

C1 100nF/X7R 0402

Supply voltage decoupling

capacitor

3/6

Demonstration board layout AN2727

3 Demonstration board layout

The printed circuit board of the demonstration board has the following characteristics:

● Board dimensions: 23 mm x 18 mm

● 2-layer PCB

● PCB thickness: 0.8 mm

● FR4 material

● Copper thickness: 18 µm

Figure 4. Top view of demonstration board

Figure 5. Bottom view of demonstration board

4/6

AN2727 Revision history

4 Revision history

Table 2. Document revision history

Date Revision Changes

3-Jun-2008 1 First release.

5/6

AN2727

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