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TSC101AILT датащи(PDF) 13 Page - STMicroelectronics

номер детали TSC101AILT
подробное описание детали  High side current sense amplifier
PDF  18 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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TSC101AILT датащи(HTML) 13 Page - STMicroelectronics

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TSC101
Application information
13/18
5
Application information
TSC101 can be used to measure current and to feed back the information to a micro
controller, as shown in Figure 6 below.
Figure 6.
Typical application schematic
The current from the supply flows to the load through the Rsense resistor causing a voltage
drop equal to Vsense across Rsense. The amplifier input currents are negligible, therefore its
inverting input voltage is equal to Vm. The amplifier's open-loop gain forces its non-inverting
input to the same voltage as the inverting input. As a consequence, the amplifier will adjust
current flowing through Rg1 so that the voltage drop across Rg1 will exactly match Vsense.
Therefore, the drop across Rg1 is:
VRg1=Vsense=Rsense.Iload
If IRg1 is the current flowing through Rg1, then IRg1 is given by the formula:
IRg1=Vsense/Rg1
The IRg1 current flows entirely into resistor Rg3 (the input bias current of the buffer is
negligible). Therefore, the voltage drop on the Rg3 resistor can be calculated as follows:
VRg3=Rg3.IRg1=(Rg3/Rg1).Vsense
5V
Vsense
Vout
load
Iload
2.8V to 30V
Rsense
Vreg
Vp
V
Out
GND
VCC
Rg1Rg2
Rg3
TSC101
Microcontroller
ADC
GND
VCC



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