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INA202-Q1 Datasheet(PDF) 10 Page - Texas Instruments

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Part # INA202-Q1
Description  High-Side Measurement Current-Shunt Monitor with Open-Drain Comparator and Reference
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA202-Q1 Datasheet(HTML) 10 Page - Texas Instruments

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G
0.6V
Reference
Comparator
OUT
CMP
IN
CMP
OUT
RESET
V
IN-
V
IN+
INA200
(G=20)
GND
V+
2
3
4
6
5
7
8
1
R
PULL-UP
4.7kW
Latch
Transparent/Reset
C
BYPASS
0.01 F
m
R
SHUNT
3mW
LoadSupply
-18Vto+80V
Load
5VSupply
R
1
R
2
INA200-Q1
INA201-Q1
INA202-Q1
SBOS558
– APRIL 2011
www.ti.com
APPLICATIONS INFORMATION
BASIC CONNECTIONS
ACCURACY VARIATIONS AS A RESULT OF
VSENSE AND COMMON-MODE VOLTAGE
Figure 27 shows the basic connections of the
INA200-Q1, INA201-Q1, and INA202-Q1. The input
The accuracy of the INA200-Q1, INA201-Q1, and
pins, VIN+ and VIN–, should be connected as closely
INA202-Q1 current shunt monitors is a function of two
as possible to the shunt resistor to minimize any
main
variables:
VSENSE
(VIN+
–
VIN–)
and
resistance in series with the shunt resistance.
common-mode voltage, VCM, relative to the supply
voltage, VS. VCM is expressed as (VIN+ + VIN–)/2;
Power-supply bypass capacitors are required for
however, in practice, VCM is seen as the voltage at
stability. Applications with noisy or high-impedance
VIN+ because the voltage drop across VSENSE is
power supplies may require additional decoupling
usually small.
capacitors to reject power-supply noise. Connect
bypass capacitors close to the device pins.
This section addresses the accuracy of these specific
operating regions:
POWER SUPPLY
•
Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS
•
Normal Case 2: VSENSE ≥ 20mV, VCM < VS
The input circuitry of the INA200-Q1, INA201-Q1, and
INA202-Q1 can accurately measure beyond the
•
Low VSENSE Case 1: VSENSE < 20mV, –16V ≤ VCM
power-supply voltage, V+. For example, the V+ power
< 0
supply can be 5V, whereas the load power-supply
•
Low VSENSE Case 2: VSENSE < 20mV, 0V ≤ VCM ≤
voltage is up to +80V. The output voltage range of
VS
the OUT terminal, however, is limited by the voltages
•
Low VSENSE Case 3: VSENSE < 20mV, VS < VCM ≤
on the power-supply pin.
80V
Figure 27. INA200-Q1 Basic Connections
10
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Copyright
© 2011, Texas Instruments Incorporated
Product Folder Link(s): INA200-Q1 INA201-Q1 INA202-Q1


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