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.
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
CC
isn’t supplied) are
CC
For more detailed information about the TSC101, refer to the datasheet.

Figure 2. Typical application for the TSC101

V
battery or power
source
2.8V to 30V
Vp Vm
Gnd
sense
R
sense
43
2
TSC101
Current Sensing
Amplifier
Vcc
Out
I
load
load
5V
5
V
CC
1
V
out
Gnd
Microcontroller
ADC
V
reg
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