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, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

TL331-Q1 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-Q1 optimal for level

shifting to a higher or lower voltage.

8.2 Typical Application

+

TL331

5 V

5 V

Vref

Input 0 V to 30 V

Figure 8-1. Typical Application Schematic

8.2.1 Design Requirements

For this design example, use the parameters listed in Table 8-1 as the input parameters.

Table 8-1. 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-Q1 in a general comparator application, determine the following:

• Input voltage range

• Minimum overdrive voltage

• Output and drive current

• Response time

8.2.2.1 Input Voltage Range

TL331-Q1, TL331B-Q1, TL391B-Q1

SLVS969F – OCTOBER 2009 – REVISED JANUARY 2021

www.ti.com

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