STMicroelectronics AN2623 Application Note

AN2623 is an application note from ST, which introduces a design method for a 160W off-line forward converter based on L5991.

Brand: STMicroelectronics
Category: Power Management
Document type: Application Note
Language: English
Pages: 25
File format: PDF
File size: 1.2 MB
Published: 06 August, 2012
Updated: 30 September, 2023
MD5 checksum: F374DDC2335CD8E9DDBF98647140A554
PDF: STMicroelectronics AN2623 Application Note PDF

About this manual

This document presents a practical example of a 160 W, isolated forward converter evaluation board designed using the L5991 high frequency current mode PWM controller. The design includes detailed procedures for both the power stage and the controller, covering components such as the primary controller, output filter, and power transformer.

What's inside

Basis of forward topology
Main characteristics
Primary controller: L5991
Output filter
Output diodes
Power transformer design
Feedback loop
Experimental results
High frequency ripple
Short circuit test

Specifications

Output power	160 W max
Output voltage	35 V
Output current	4.5 A max continuous
Efficiency at full load	80%
Maximum ambient temperature	70°C

Frequently asked questions

What is the power rating of the converter described in this note?

The converter is rated for a maximum output power of 160 W.

Which controller IC is used in the design?

The design uses the L5991 high frequency current mode PWM controller.

Does the design include a PFC pre-regulator stage?

No, the forward converter presented in this document does not have a PFC stage.

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