+

TL331

5 V

5 V

Vref

Input 0 V to 30 V

10

TL331, TL331B, TL391B

SLVS238H – AUGUST 1999 – REVISED MAY 2020

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Product Folder Links: TL331 TL331B TL391B

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Copyright © 1999–2020, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

TL331 will typically be used to compare a single signal to a reference or two signals against each other. Many

users take advantage of the open drain output to drive the comparison logic output to a logic voltage level to an

MCU or logic device. The wide supply range and high voltage capability makes TL331 optimal for level shifting to

a higher or lower voltage.

8.2 Typical Application

Figure 4. Typical Application Schematic

8.2.1 Design Requirements

For this design example, use the parameters listed in Table 1 as the input parameters.

Table 1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Input Voltage Range

Supply Voltage

2 V to 36 V

2 V to 36 V

1 µA to 4 mA

Input Overdrive Voltage

100 mV

Reference Voltage

2.5 V

15 pF

8.2.2 Detailed Design Procedure

When using TL331 in a general comparator application, determine the following:

•

Input voltage range

•

Minimum overdrive voltage

•

Output and drive current

•

Response time