DER-096: 3.3V @ 2A, 5 and 12V @ 200mA, 48V in

Summary

This document is an engineering prototype report describing a VoIP prototype power supply utilizing DPA423P. The power supply delivers 10 W continuous from an input of 37 to 57 VDC.

The design has been optimized to minimize radiated EMI emissions.

In the EMI section of the report it can be seen that there is a dramatic improvement in radiated EMI over the existing production DPA423 design.

This document provides complete design information including specification, schematic, bill of material and transformer design and construction information. The document also provides performance information.

The power supply uses a DPA423 device (U1), with integrated MOSFET and controller, in an isolated flyback configuration. The circuit also uses the under-voltage shutdown feature of the device along with current limit setting to minimize transformer size. The device operates at a switching frequency of 300 kHz.

Specifications

Manufacturer Power Integrations
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Multi Output
Eval Board Board not Stocked
Topology Step Down
Outputs and Type 3 Isolated
Voltage Out: Highest Current First 3.3V, 5V, 12V
Current Out 2A, 200mA, 200mA
Voltage In 37 ~ 57 V
Efficiency @ Conditions >60%, 57 VDC, 3.9 ~ 10 W
>60%, 48 VDC, 3.3 ~ 10 W
>60%, 37 VDC, 3 ~ 10 W
Voltage Out Range 3.135 ~ 3.465, 4.75 ~ 5.25, 11.4 ~ 12.6 V
Features Current Limit (Adj. or Fixed)
Over Voltage Protection
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 300 kHz
Standby Current [Typical] - Not Given
Quiescent Current [Typical] - Not Given
Component Count + Extras 63 + 5
Internal Switch Yes
Design Author Power Integrations
Application / Target Market VOIP Phones
Standby Current [Maximum] - Not Given
Quiescent Current [Maximum] - Not Given
Main I.C. Base Part DPA423
Date Created By Author 2005-09
Date Added To Library 2015-05

Support Documents & Media

DER-96 - User Guide DPA422-426 - Datasheet

Media

DER_96_Schematic_Full.png DER_96_Board_Full.jpg DER_96_Chart_1_Full.png DER_96_Chart_2_Full.png DER_96_Chart_3_Full.png