I

SW

FB

VIN

EN/UVLO

TC

GND

RSET

LM25183

C

OUT

C

IN

3 x

22

F

10

F

T

1

V

1 : 1

D

FLY

R

SET

12.1 k:

R

FB

121 k:

D

CLAMP

D

F

R

TC

261 k:

R

UV1

261 k:

R

UV2

97.1 k:

D

OUT

13 V

12.5 PH

V

20 V

SS/BIAS

C

SS

47 nF

16

LM25183-Q1

SNVSBJ4 – APRIL 2020

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Product Folder Links: LM25183-Q1

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Copyright © 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

The LM25183-Q1 requires only a few external components to convert from a wide range of supply voltages to

one or more isolated output rails. To expedite and streamline the process of designing of a LM25183-Q1-based

converter, a comprehensive LM25183-Q1 quick-start calculator is available for download to assist the designer

with component selection for a given application. WEBENCH® online software is also available to generate

complete designs, leveraging iterative design procedures and access to comprehensive component databases.

The following sections discuss the design procedure for both single- and dual-output implementations using

specific circuit design examples.

As mentioned previously, the LM25183-Q1 also integrates several optional features to meet system design

requirements, including precision enable, input UVLO, programmable soft start, output voltage thermal

compensation, and external bias supply connection. Each application incorporates these features as needed for

a more comprehensive design.

The application circuits detailed in the Typical Applications show LM25183-Q1 configuration options suitable for

several application use cases. Refer to the LM25184EVM-S12 EVM user's guide for more detail.

8.2 Typical Applications

For step-by-step design procedures, circuit schematics, bill of materials, PCB files, simulation and test results of LM25183-Q1-powered

implementations, refer to the TI Reference Design library.

The schematic diagram of a 12-V, 0.6-A PSR flyback converter is given in Figure 19.