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EVAL2QR2280G1TOBO1: 5V @ 4A, 85 ~ 265 VAC


This application note is a description of 20 W switching mode power supply evaluation board designed in a quasi-resonant flyback converter topology using ICE2QR2280G-1 Quasi-resonant CoolSET™ .

The target application of ICE2QR2280G-1 are for set-top box, portable game controller, DVD player, netbook adapter and auxiliary power supply for LCD TV, etc. With the CoolMOS™ integrated in this IC, it greatly simplifies the design and layout of the PCB. Due to valley switching, the turn-on voltage is reduced and this offers higher conversion efficiency comparing to hard-switching flyback converter.

With the DCM mode control, the reverse recovery problem of secondary rectify diode is relieved. And for its natural frequency jittering with line voltage, the EMI performance is better. Infineon’s digital frequency reduction technology enables a quasi-resonant operation till very low load. As a result, the system efficiency, over the entire load range, is significantly improved compared to conventional free running quasi resonant converter implemented with only maximum switching frequency limitation at light load. In addition, numerous adjustable protection functions have been implemented in ICE2QR2280G-1 to protect the system and customize the IC for the chosen application.

In case of failure modes, like open control-loop/over load, output overvoltage, and transformer short winding, the device switches into Auto Restart Mode or Latch-off Mode. By means of the cycle-by-cycle peak current limitation plus foldback point correction, the dimension of the transformer and current rating of the secondary diode can both be optimized. Thus, a cost effective solution can be easily achieved.

This document contains the list of features, the power supply specification, schematic, bill of material and the transformer construction documentation. Typical operating characteristics such as performance curve and scope waveforms are showed at the rear of the report.


Manufacturer Infineon Technologies
Category AC/DC and DC/DC Conversion
Sub-Category AC/DC SMPS - Single Output
Eval Board Part Number EVAL2QR2280G1TOBO1-ND
Eval Board Supplier Infineon Technologies
Eval Board Normally In Stock
AC Voltage 115 V
230 V
Universal (115 / 230V)
Outputs and Type 1 Isolated
Voltage Out 5 V
Current Out 4 A
Output Power 20 W
Features Current Limit (Adj. or Fixed)
Over Current Protection
Over Voltage Protection
Short Circuit Protection
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Efficiency @ Conditions >80%, 230 VAC, 5V @ 23 ~ 83% power
>80%, 115 VAC, 5V @ 6 ~ 75% power
No-load Input Power @ Voltage - Not Given
<50 mW @ 85 ~ 265 VAC
Switching Frequency 65 kHz
Internal Switch Yes
Component Count + Extras 33 + 2
Voltage In 85 ~ 265 VAC
Design Author Infineon Technologies
Application / Target Market AC Adapters
Auxiliary Power Supply
Battery Chargers
DVD/Blu-ray Players
Hi Fi Audio
Home Theater
LCD TV / Monitor
Printer, Plotter
Set-Top Boxes
Main I.C. Base Part ICE2QR2280
Date Created By Author 2015-04
Date Added To Library 2017-05

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