INA202AID Datasheet, PDF (10/26 Pages) Texas Instruments – High-Side Measurement Current-Shunt Monitor with Open-Drain Comparator and Reference

INA200
INA201
INA202
SBOS374C – NOVEMBER 2006 – REVISED OCTOBER 2010
APPLICATIONS INFORMATION
www.ti.com
BASIC CONNECTIONS
Figure 26 shows the basic connections of the
INA200, INA201, and INA202. The input pins, V_IN+
and V_IN–, should be connected as closely as possible
to the shunt resistor to minimize any resistance in
series with the shunt resistance.
Power-supply bypass capacitors are required for
stability. Applications with noisy or high-impedance
power supplies may require additional decoupling
capacitors to reject power-supply noise. Connect
bypass capacitors close to the device pins.
POWER SUPPLY
The input circuitry of the INA200, INA201, and
INA202 can accurately measure beyond the
power-supply voltage, V+. For example, the V+ power
supply can be 5V, whereas the load power-supply
voltage is up to +80V. The output voltage range of
the OUT terminal, however, is limited by the voltages
on the power-supply pin.
ACCURACY VARIATIONS AS A RESULT OF
V_SENSE AND COMMON-MODE VOLTAGE
The accuracy of the INA200, INA201, and INA202
current shunt monitors is a function of two main
variables: V_SENSE (V_IN+ – V_IN–) and common-mode
voltage, V_CM, relative to the supply voltage, V_S. V_CM is
expressed as (V_IN+ + V_IN–)/2; however, in practice,
V_CM is seen as the voltage at V_IN+ because the
voltage drop across V_SENSE is usually small.
This section addresses the accuracy of these specific
operating regions:
• Normal Case 1: V_SENSE ≥ 20mV, V_CM ≥ V_S
• Normal Case 2: V_SENSE ≥ 20mV, V_CM < V_S
• Low V_SENSE Case 1: V_SENSE < 20mV, –16V ≤ V_CM
<0
• Low V_SENSE Case 2: V_SENSE < 20mV, 0V ≤ V_CM ≤
V_S
• Low V_SENSE Case 3: V_SENSE < 20mV, V_S < V_CM ≤
80V
Load Supply
-18V to +80V
C_BYPASS
0.01mF
R_SHUNT
3mW
1
V+
INA200
(G = 20)
2 OUT
G
0.6V
R₁
Reference
V_IN+ 8
V_{IN- 7}
3 ^CMPIN
R₂
4
GND
Comparator
CMP_{OUT 6}
RESET ⁵
R_PULL-UP
4.7kW
Load
5V Supply
Transparent/Reset Latch
Figure 26. INA200 Basic Connections
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