7 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.

7.1 Application Information

TL331x 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 TL331x optimal for level shifting

to a higher or lower voltage.

7.2 Typical Application

+

TL331

5 V

5 V

Vref

Input 0 V to 30 V

Figure 7-1. Typical Application Schematic

7.2.1 Design Requirements

For this design example, use the parameters listed in Table 7-1 as the input parameters.

Table 7-1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Input Voltage Range

0V to VCC – 1.5V

Supply Voltage

2V to 36V

Logic Supply Voltage (RPULLUP Voltage)

2V to 36V

Output Current (VLOGIC/RPULLUP)

1µA to 4mA

Input Overdrive Voltage

100mV

Reference Voltage

2.5V

Load Capacitance (CL)

15pF

7.2.2 Detailed Design Procedure

When using TL331x in a general comparator application, determine the following:

• Input voltage range

• Minimum overdrive voltage

• Output and drive current

• Response time

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TL331, TL331B, TL391B

SLVS238L – AUGUST 1999 – REVISED NOVEMBER 2024

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