C

(in F)=

m

DELAY

t

D

5

0V

0.6V

V

IN

CMPOut

RESET

Copyright © 2016, Texas Instruments Incorporated

1

2

3

4

5

6

7

14

13

12

11

10

9

8

VIN+

VIN±

1.2V REF OUT

CMP1 OUT

CMP2 OUT

CMP2 DELAY

CMP1 RESET

VS

OUT

CMP1 IN± /0.6V REF

CMP1 IN+

CMP2 IN+

CMP2 IN± /0.6V REF

GND

1.2V REF

12

INA203-Q1

SBOS539A – DECEMBER 2010 – REVISED APRIL 2016

www.ti.com

Product Folder Links: INA203-Q1

Submit Documentation Feedback

Copyright © 2010–2016, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The INA203-Q1 device is a unidirectional voltage output current-sense amplifier with dual comparators and

voltage reference. The INA203-Q1 operates over a wide range of common-mode voltage (–16 V to +80 V) and

incorporates two open-drain comparators with internal 0.6-V references. Comparator 1 includes a latching

capability, and Comparator 2 has a user-programmable delay. The device also incorporates a 1.2-V reference

output.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Comparator

The INA203-Q1 incorporates two open-drain comparators. These comparators typically have 2 mV of offset and

a 1.3-

μs (typical) response time. The output of Comparator 1 latches and is reset through the CMP1 RESET pin,

as shown in Figure 26.

The INA203-Q1 device includes additional features for comparator functions. The comparator reference voltage

of both Comparator 1 and Comparator 2 can be overridden by external inputs for increased design flexibility.

Comparator 2 has a programmable delay.

Figure 26. Comparator Latching Capability

8.3.2 Comparator Delay

The Comparator 2 programmable delay is controlled by a capacitor connected to the CMP2 Delay Pin; see

Figure 30. The capacitor value (in

μF) is selected by using Equation 1:

(1)

A simplified version of the delay circuit for Comparator 2 is shown in Figure 27. The delay comparator consists of

two comparator stages with the delay between them.