9 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.

9.1 Application Information

This section highlights some of the design considerations when implementing this device in various applications.

9.2 Typical Application

This typical application demonstrates how the TPS22950 device can be used to set an adjustable current limit.

+

-

L

H

VIN

Fault

R

L

ON

C

IN

V

IN

R

FLT

C

L

VOUT

GND

FLT

ILIM

R

ILIM

Figure 9-1. Typical Application

9.2.1 Design Requirements

For this example, the values below are used as the design parameters.

Table 9-1. Design Parameters

PARAMETER

VALUE

5 V

Load Current (mA)

100 mA

Typical Current Limit (mA)

500 mA

9.2.2 Detailed Design Procedure

In this example the nominal load current is 100 mA, so the current limit can be set to 500 mA without disrupting

normal operation. Use Equation 2 to calculate the resistor needed on the ILIM pin.

(2)

where

Based on Equation 2, a 2.21-kΩ resistor should be used on the ILIM pin to set a typical current limit of 500 mA.

9.2.3 Application Curves

The below scope shot shows the device turning on into a fault condition and limiting the current to the specified

amount of 500 mA.

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TPS22950

SLVSFJ2 – DECEMBER 2020

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