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1、Application Note, V1.1, 22 June 2011 N e v e rs t o pt h i n k i n g . Power Management & Supply Application Note AN- EVALQRS-ICE2QS03G 36W Evaluation Board with Quasi-Resonant PWM Controller ICE2QS03G Published by Infineon Technologies AG 81726 Munich, Germany 2007 Infineon Technologies AG All Righ
2、ts Reserved. Legal Disclaimer The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Inf
3、ineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights of any third party. Information For further information on technology, delivery terms and conditions and prices, please
4、 contact the nearest Infineon Technologies Office ( ). Warnings Due to technical requirements, components may contain dangerous substances. For information on the types in question, please contact the nearest Infineon Technologies Office. Infineon Technologies components may be used in life-support
5、devices or systems only with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support devices or systems
6、 are intended to be implanted in the human body or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. Title Revision History:22 June 2011V1.1 Previous Version:V1.0 PageSubjects (ma
7、jor changes since last revision) 11, 12, 13Revise BOM, transformer drawing 36W Evaluation Board with Quasi-Resonant PWM Controller ICE2QS03G License to Infineon Technologies Asia Pacific Pte LtdAN-PS0040 Eric Kok Eric.kok Wang Zan zan.wang He Yi Yi.he Jeoh Meng kiat Mengkiat.jeoh We Listen to Your C
8、omments Any information within this document that you feel is wrong, unclear or missing at all? Your feedback will help us to continuously improve the quality of this document. Please send your proposal (including a reference to this document) to: comments EVALQRS-36W-ICE2QS03G Application Note22 Ju
9、ne 20114 Table of Contents 1Content.5 2Evaluation Board.5 3List of Features5 4Technical Specifications.5 5Circuit Description 6 5.1Mains Input and Rectification6 5.2PWM Control.6 5.3Snubber Network6 5.4Output Stage.6 5.5Feedback Loop.6 6Circuit Operation .6 6.1Startup Operation.6 6.2Normal Mode Oper
10、ation.7 6.3Digital Frequency Reduction.7 7Protection Features.7 7.1Vcc under voltage protection 7 7.2Foldback point protection7 7.3Open loop/over load protection.7 7.4Adjustable output overvoltage protection7 7.5Short winding protection .7 8Circuit diagram 8 8.1PCB Topover layer9 8.2PCB Bottom Layer
11、10 9Component List .11 10Transformer Construction12 11Test Results .13 11.1Efficiency 13 12References .15 EVALQRS-36W-ICE2QS03G Application Note22 June 20115 1Content The demo-board described here is a 36W power supply using quasi-resonant flyback converter topology. The PWM controller ICE2QS03G is
12、a second generation quasi-resonant controller IC developed by Infineon Technologies. The typical applications are for TV-sets, DVD-players, Set-top boxes, netbook adapters, home audio and printer applications. In normal operation, the digital frequency reduction with decreasing load enables a quasi-
13、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. In addition, numerous protection functions have
14、been implemented in ICE2QS03G 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-c
15、ycle peak current limitation plus foldback point correction, the dimension of the transformer and the secondary diode can be lower which leads to more cost effective design. 2Evaluation Board Figure 1-EVALQRS-36W-ICE2QS03G 3List of Features Quasi-resonant operation Digital frequency reduction with d
16、ecreasing load Cycle-by-cycle peak current limitation with foldback point correction Built-in digital soft-start Direct current sensing with internal Leading Edge Blanking Time VCC undervoltage protection: IC stop operation, recover with softstart VCC overvoltage protection: IC stop operation, recover with softstart Openloop/Overload protection: Auto Restart after fixed blanking time Output overvoltage protection: Latch-off with adjustable threshold Short-winding protection: Latch-of
