G

Comparator

INA200

(G = 20)

2

3

4

6

5

7

8

1

Latch

Transparent / Reset

Load

5-V Supply

0.6-V

Reference

RESET

CMPOUT

VIN+

VIN-

OUT

GND

CMPIN

VS

R2

R1

CBYPASS 0.01 µF

SW

RSHUNT

3 m

Load Supply

-18 V to 80 V

RPULLUP

4.7 k

Copyright © 2017, Texas Instruments Incorporated

14

INA200, INA201, INA202

SBOS374E – NOVEMBER 2006 – REVISED SEPTEMBER 2017

www.ti.com

Product Folder Links: INA200 INA201 INA202

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Copyright © 2006–2017, Texas Instruments Incorporated

Figure 26. INA200 Basic Connections

7.3.2 Selecting RS

The selected value for the shunt resistor, RS, depends on the application and is a compromise between small-

signal accuracy and maximum permissible voltage loss in the measurement line. High values of RS provide better

accuracy at lower currents by minimizing the effects of offset, while low values of RS minimize voltage loss in the

supply line. For most applications, using an RS value that provides a full-scale shunt voltage range of 50 mV to

100 mV results in the best performance. Maximum input voltage for accurate measurements is 500 mV, but

output voltage is limited by supply.

7.3.3 Comparator

The INA200, INA201, and INA202 devices incorporate an open-drain comparator. This comparator typically has

2 mV of offset and a 1.3-μs (typical) response time. The output of the comparator latches and is reset through

the RESET pin; see Figure 28.

When Vs and RESET are different, TI recommends adding a low-pass filter (LPF) on the RESET pin to avoid

comparator behavior inconsistent with the data sheet. For instance, with a 12-V supply and a 3.3-V RESET, a

rise time of 400 ns is appropriate. Similarly, with an 18-V supply and a 2.7-V RESET, a 1-µs rise time is

appropriate; see Figure 31.