TSC1031IDT STMicroelectronics, TSC1031IDT Datasheet - Page 16

• Manufacturer Part Number: TSC1031IDT
• Description: IC AMP HI SIDE CURR SENSE 8SOIC
• Manufacturer: STMicroelectronics

Specifications of TSC1031IDT

• Amplifier Type: Current Sense
• Number Of Circuits: 1
• Slew Rate: 0.6 V/µs
• -3db Bandwidth: 700kHz
• Current - Input Bias: 10µA
• Voltage - Input Offset: 500µV
• Current - Supply: 200µA
• Current - Output / Channel: 26mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 5.5 V, ±1.35 V ~ 2.75 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Number Of Channels: Dual
• Common Mode Rejection Ratio (min): 90 dB
• Input Voltage Range (max): 5.5 V
• Input Voltage Range (min): 2.7 V
• Input Offset Voltage: 1100 uV
• Input Bias Current (max): 10 uA
• Supply Current: 300 uA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Temperature Range: - 40 C to + 125 C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Gain Bandwidth Product: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-10452-2

Application information
6
16/23
Application information
The TSC1031 can be used to measure current and to feed back the information to a
microcontroller.
Figure 9.
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 Rg1 is:
If I
The I
negligible). Therefore, the voltage drop on the R
Since the voltage across the R
as:
or:
Rg1
V
I
V
V
V
Rg1
Rg1
out
out
Rg1
Rg3
is the current flowing through Rg1, then I
current flows entirely into resistor R
= (R
= (R
= V
= V
= R
sense
Typical application
sense
g3
g3
g3
sense
Cf
/R
/R
.I
Rg1
/Rg1
g1
g1)
Rg1
TSC1031
Rf1
Vp
= R
).V
across R
.R
= (R
sense
sense
sense
Vsense
Vcc-
g3
/R
.I
.I
load
load
sense
g1
Rg2
Rf2
Vm
Doc ID 16875 Rev 1
g3
).V
Iload
resistor is buffered to the Out pin, V
amplifier
Cf
. The amplifier’s input currents are negligible, therefore its
sense
Sense
m
. The amplifier's open-loop gain forces its non-inverting
A1
Rg3
g3
Rf3
(the input bias current of the buffer is
Rg1
Common-mode voltage: 2.9 V to 70 V
g3
Vcc
K2
Voltage
Gnd
buffer
resistor can be calculated as follows.
is given by the formula:
SEL
Out
sense
resistor causing a voltage
out
GPIO
can be expressed
µController
Vcc
Gnd
ADC
5 V
AM04523
TSC1031
sense
.