80- A

m

Current Regulator

80 mA

60 mA

10 mA

10 mA

OUT

GND

IN+

IN−

Epi-FET

Diodes

Resistors

Transistors

COMPONENT COUNT

1

2

1

20

TL331

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SLVS238G – AUGUST 1999 – REVISED JANUARY 2015

8 Detailed Description

8.1 Overview

The TL331 is a single comparator with the ability to operate up to 36 V on the supply pin. This standard device

has proven ubiquity and versatility across a wide range of applications. This is due to it's very wide supply

voltages range (2 V to 36 V), low Iq and fast response.

enable the comparator to be used in AND functionality.

8.2 Functional Block Diagram

Current values shown are nominal.

8.3 Feature Description

TL331 consists of a PNP darlington pair input, allowing the device to operate with very high gain and fast

response with minimal input bias current. The input Darlington pair creates a limit on the input common mode

enables much head room for modern day supplies of 3.3 V and 5.0 V.

The output consists of an open drain NPN (pull-down or low side) transistor. The output NPN will sink current

when the positive input voltage is higher than the negative input voltage and the offset voltage. The VOL is

current.

8.4 Device Functional Modes

8.4.1 Voltage Comparison

The TL331 operates solely as a voltage comparator, comparing the differential voltage between the positive and

negative pins and outputting a logic low or high impedance (logic high with pull-up) based on the input differential

polarity.

Copyright © 1999–2015, Texas Instruments Incorporated

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Product Folder Links: TL331