OUT1

OUT2

IN

IN

GND

FAULT 1

ILIM

EN2

24.9k

100 k

VIN = 5V

VOUT1

TPS2561A-Q1

0.1 uF

Faultx Signals

Power Pad

VOUT2

EN1

Control Signals

FAULT 2

2x 150 µF

TPS2561A-Q1

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SLVSCC6A – MARCH 2014 – REVISED JUNE 2014

10 Application and Implementation

10.1 Application Information

The device is current-limited, power-distribution switch. It would limit the output current to IOS when short circuits

or heavy capacitive loads are encountered.

10.2 Typical Application

10.2.1 Design Current Limit

Figure 12. Typical Characteristics Reference Schematic

10.2.1.1 Design Requirements

For this design example, use the following as the input parameters.

Table 1. Design Parameters

DESIGN PARAMTER

EXAMPLE VALUE

Input voltage

5V

Minimum current limit

2A

Maximum current limit

1A

10.2.1.2 Detailed Design Procedure

10.2.1.2.1

Determine Design Parameters

Beginning the design process requires deciding on a few parameters. The designer must know the following:

•

Input voltage

•

Minimum current limit

•

Maximum current limit

10.2.1.2.2

Programming the Current-Limit Threshold

threshold for both channels. The TPS2561A-Q1 use an internal regulation loop to provide a regulated voltage on

the ILIM pin. The current-limit threshold is proportional to the current sourced out of ILIM. The recommended 1%

applications require that the minimum current limit is above a certain current level or that the maximum current

limit is below a certain current level, so it is important to consider the tolerance of the overcurrent threshold when

possible to reduce parasitic effects on the current-limit accuracy.

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