TSC1031 STMicroelectronics, TSC1031 Datasheet - Page 19

• Manufacturer Part Number: TSC1031
• Description: High-voltage high side current sense amplifier
• Manufacturer: STMicroelectronics

Specifications of TSC1031

• Wide Common-mode Operating Range: 2.9 to 70 V in single-supply configuration -2.1 to 65 V in dual-supply configuration
• Wide Common-mode Surviving Range: -16 to 75 V (reversed battery and load-dump conditions)
• Supply Voltage Range: 2.7 to 5.5 V in single supply configuration
• Low Current Consumption: ICCmax = 360 μA
• Pin Selectable Gain: 50 V/V or 100 V/V

TSC1031
7
Application information
The TSC1031 can be used to measure current and to feed back the information to a
microcontroller.
Figure 22. Typical application
The current from the supply flows to the load through the R
drop equal to V
inverting input voltage is equal to V
input to the same voltage as the inverting input. As a consequence, the amplifier adjusts
current flowing through Rg1 so that the voltage drop across Rg1 exactly matches V
Therefore, the drop across R
If I
The I
R
The voltage across the R
a gain equal to 2. Therefore V
or: V
g3
Rg1
. Therefore, the voltage drop on the R
out
V
I
V
V
Rg1
Rg1
out
Rg1
Rg3
is the current flowing through R
= Av .R
current flows is multiplied by a ratio K2 and the resulting current flows into resistor
= 2.K1.K2.V
= V
= V
= R
sense
sense
g3
TSC1031
sense
sense
Rg1
.K2.I
5K
Rf1
Vp
/R
= R
.I
g1
Rg1
Rsense
across R
amplifier
load
Vsense
sense
Sense
sense
= (R
g3
Vcc
= Av .V
.I
resistor is buffered to the Out pin by the voltage buffer, featuring
Rf2
Vm
Rg2
-
load
g3
g1
sense
Iload
out
Doc ID 16875 Rev 2
/R
is:
multiplier
Current
g1
can be expressed as:
sense
. The amplifier’s input currents are negligible, therefore its
m
).K2.V
. The amplifier's open-loop gain forces its non-inverting
g1
with Av= 2.K1.K2
, then I
2.5 or 5
sense
g3
Rg3
50K
Vcc+
K2
resistor can be calculated as follows.
Common-mode voltage: 2.9 V to 70 V
= K1.K2.V
Rg1
Rf3
A1
is given by the formula:
x2
sense
SEL
Gnd
Out
sense
with K1=R
Vout
resistor causing a voltage
Application information
GPIO
g3
Gnd
Vcc
µController
ADC
/R
g1
AM06157
=10.
5 V
sense
19/26
.