STMicroelectronics AN2426 Auxiliary Power Supply Application Note

This document describes the reference design of the 25W Switch Mode Power Supply which is dedicated to industrial or white goods applications. The board accepts wide range input voltages (90 to 265Vrms) and delivers 2 or 3 output voltages depending on the version. Two types of power supply are available: negative output or positive output voltage. The actual version depends the way the components are assembled on the secondary side and on the configuration of jumpers. On the primary side, the PCB and transformer are the same for both versions. More information is available in Chapter 3. The Switch mode power supply is based on the VIPer53E. The VIPer53E combines in the same package an enhanced current mode PWM controller with a high voltage MDMesh Power Mosfet. High efficiency and low standby consumption are the main characteristics of this board. Such features, coupled with minimal part requirements and global low cost in addition to, makes it an ideal solution for powering industrial or consumer equipment, meeting worldwide standards.


STMicroelectronics AN2426 Auxiliary Power Supply Application Note - cover page
Brand
STMicroelectronics
Category
Power System Manager
Document type
Application Note
Language
English
Pages
45
File format
PDF
File size
915 KB
Published
06 August, 2012
Updated
30 September, 2023
MD5 checksum
E6878157715DA5A5070EC3F8D9364443

About this manual

This document details the reference design of a 25W Switch Mode Power Supply (SMPS) dedicated to industrial or white goods applications. The design is based on the VIPer53E, which integrates an enhanced current mode PWM controller with a high voltage MDMesh Power Mosfet in a single package. The board accepts a wide input voltage range of 90 to 265Vrms and delivers 2 or 3 output voltages depending on the specific version configuration.

What's inside

  • Introduction
  • Main characteristics
  • Circuit description
  • Cross regulation and stand by
  • Functional checking
  • Conducted noise measurements
  • Partlist
  • PCB layout
  • Transformer specification
  • Revision history

Specifications

Input voltage90-265Vrms
Frequency45-66Hz
Standby consumption<1 Watt
EMI standardEN55022 Class B
Output voltages (Positive)3.3V/100mA, 5V/3A, 12V/0.8A
Output voltages (Negative)-5V/3A, -12V/0.8A

Frequently asked questions

What is the input voltage range?

The board accepts a wide range of input voltages from 90 to 265Vrms.

What is the maximum standby consumption?

The standby consumption is less than 1 Watt.

Which EMI standard does the design meet?

The design complies with EMI according to EN55022 Class B.

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