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STMicroelectronics Electronic Components Datasheet

TSC888 Datasheet

Low cost high-side current sense amplifier

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TSC888 pdf
TSC888
Low cost high-side current sense amplifier
Features
Independent supply and input common-mode
voltages
Wide common-mode operating range: 2.8 V to
24 V
Wide supply voltage range: 4 to 24 V
Low current consumption: ICC max = 1 mA
Internally fixed gain: 20 V/V, 50 V/V or 100 V/V
Buffered output
Applications
Desktop computers and servers SMPS
Photovoltaic/solar systems
Battery chargers
Notebook computers
DC motor control
Description
The TSC888 measures a small differential voltage
on a high-side shunt resistor and translates it into
a ground-referenced output voltage. The gain is
internally fixed.
Wide input common-mode voltage range, low
quiescent current, and tiny SOT23-5 packaging
make the TSC888 ideal for use in a wide variety
of applications.
Input common-mode and power supply voltages
are independent. Common-mode voltage can
range from 2.8 V to 24 V in operating conditions.
Current consumption lower than 1 mA and wide
supply voltage range allow to connect the power
supply to either side of the current measurement
shunt with minimal error.
L
SOT23-5
(Plastic package)
Pin connections
(top view)
Out 1
Gnd 2
Vp 3
5 Vcc
4 Vm
June 2008
Rev 1
1/7
www.st.com
7
Free Datasheet http://www.datasheet4u.net/


STMicroelectronics Electronic Components Datasheet

TSC888 Datasheet

Low cost high-side current sense amplifier

No Preview Available !

TSC888 pdf
Application schematics and pin description
1 Application schematics and pin description
TSC888
The TSC888 high-side current-sense amplifier features a 2.8 V to 24 V input common-mode
range that is independent of supply voltage. The main advantage of this feature is to allow
high-side current sensing at voltages much greater than the supply voltage (VCC). The
TSC888 can therefore be supplied by a 5 Vsb line and monitor a 3.3 V, 5 V or 12 V power
line. Considering the wide supply voltage operating range (4 V to 24 V) another option
available in most cases is to connect the VCC pin to the Vp pin.
Figure 1. Application schematics
Vsense
Iload
12V, 5V or 3.3V line
Main
PWM
controller
Stand-by
PWM
controller
5Vsb
Vp
Vcc
TSC888
Vm
Out
Monitoring
device
Gnd
Vout=Vsense.Av
Table 1 describes the function of each pin. Their position is shown in the illustration on the
cover page and in Figure 1 above.
Table 1. Pin description
Symbol
Type
Function
Out
Analog output
The out voltage is proportional to the magnitude of the sense
voltage Vp-Vm.
Gnd Power supply Ground line.
Vcc Power supply Positive power supply line.
Vp
Analog input
Connection for the external sense resistor. The measured current
enters the shunt on the Vp side.
Vm
Analog input
Connection for the external sense resistor. The measured current
exits the shunt on the Vm side.
2/7
Free Datasheet http://www.datasheet4u.net/


Part Number TSC888
Description Low cost high-side current sense amplifier
Maker STMicroelectronics
Total Page 7 Pages
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