Infineon ICE5ASAG 60W開關(guān)電源解決方案詳解

infineon公司的ICE5ASAG是第五代固定頻率PWM控制器，采用軟柵極驅(qū)動和頻率抖動操作使得在輕負(fù)載和50%間有更低的EMI和更好的效率。器件工作電壓（10.0~25.5 V），待機時的功耗小于10mW，內(nèi)置了數(shù)字軟起動，集成的誤差放大器支持非隔離反激的直接反饋，主要用在家用電器，白色家電，TV，PC和服務(wù)器的輔助電源，藍(lán)光播放器，機頂盒以及LCD/LED監(jiān)視器。本文介紹了ICE5ASAG產(chǎn)品亮點和主要特性，框圖和應(yīng)用電路，以及采用ICE5ASAG和IPA80R600P7的60 W 12 V 5 V SMPS演示板DEMO_5ASAG_60W1主要特性，電路圖，材料清單和PCB設(shè)計圖。

The ICE5xSAG is the 5th generation of fixed frequency PWM controller optimized for off-line switch mode power supply in cascode configuration. The cascode configuration helps achieve fast startup. The frequency reduction with soft gate driving and frequency jitter operation offers lower EMI and better efficiency between light load and 50% load. The selectable entry and exit standby power ABM enables flexibility and ultra-low power consumption at standby mode with small and controllable output voltage ripple. The product has a wide operating range （10.0 ~ 25.5 V） of IC power supply and lower power consumption. The numerous protection functions with adjustable line over voltage protection support the power supply system in failure situations. All these make the 5th generation ICE5xSAG series an outstanding PWM controller for fixed frequency flyback converter in the market.

ICE5ASAG產(chǎn)品亮點：

Enhanced Active Burst Mode with selectable entry and exit standby power to reach the lowest standby power 《100 mW

Digital frequency reduction for better overall system efficiency

Fast startup achieved with cascode configuration

Frequency jitter and soft gate driving for low EMI

Integrated error amplifier

Comprehensive protection with input line over voltage protection

Pb-free lead plating， halogen-free mold compound， RoHS compliant

ICE5ASAG主要特性：

Enhanced Active Burst Mode with selectable entry and exit standby power

Digital frequency reduction for better overall system efficiency

Fast startup achieved with cascode configuration

DCM and CCM operation with slope compensation

Frequency jitter and soft gate driving for low EMI

Built-in digital soft start

Integrated error amplifier to support direct feedback in non-isolated flyback

Comprehensive protection with input line over voltage protection， VCC over voltage， VCC under voltage， overload/open loop， over temperature and Current Sense （CS） short to GND

All protections are in auto restart mode

Limited charging current for VCC short to GND

ICE5ASAG應(yīng)用：

Auxiliary power supply for home appliances/white goods， TV， PC & server

Blu-ray player， set-top box & LCD/LED monitor

圖1.ICE5ASAG框圖

圖2.ICE5ASAG和TL431與光耦在隔離反激的應(yīng)用電路

圖3.ICE5ASAG采用集成誤差放大器的非隔離反激應(yīng)用電路

采用ICE5ASAG和IPA80R600P7的60 W 12 V 5 V SMPS演示板DEMO_5ASAG_60W1

This document is an engineering report that describes a universal-input 60 W 12 V 5 V off-line isolated Flyback converter using the latest fifth-generation Infineon Fixed Frequency Controller （FFC） ICE5ASAG and CoolMOSTM IPA80R600P7， which offers high-efficiency， low standby power with selectable entry and exit standby power options， wide VCC operating range with fast start-up， robust line protection with input Over Voltage Protection （OVP） and various protection modes for a highly reliable system. This demo board is designed for users who wish to evaluate the performance of ICE5ASAG and IPA80R600P7 in terms of optimized efficiency， thermal performance and EMI.

This document is intended for power supply design/application engineers， students， etc. who wish to design low-cost and highly reliable systems for off-line SMPS; either auxiliary power supplies for white goods， PCs， servers and TVs， or enclosed adapters for Blu-ray players， set-top boxes， games consoles， etc.

This document is an engineering report for a 60 W 12 V 5 V demo board designed in an FF isolated Flyback converter topology using the fifth-generation FFC ICE5ASAG and a P7 series of HV CoolMOSTM IPA80R600P7. The demo board is operated in Discontinuous Conduction Mode （DCM） and is running at 100 kHz fixed switching frequency. The frequency reduction with soft gate driving and frequency jittering offers lower EMI and better efficiency between light load and 50% load. The selectable Active Burst Mode （ABM） power enables ultra-low power consumption. In addition， numerous adjustable protection functions have been implemented in ICE5ASAG to protect the system and customize the IC for the chosen application. In case of failures like line Over Voltage （OV）， VCC OV/Under Voltage （UV）， open control-loop or over-load， over-temperature， VCC short-to- GND and CS short-to-GND， the device enters protection mode. By means of the cycle-by-cycle Peak Current Limitation （PCL）， the dimensions of the transformer and current rating of the secondary diode can both be optimized. In this way， a cost-effective solution can easily be achieved. The target applications of ICE5ASAG are either auxiliary power supplies for white goods， PCs， servers and TVs， or enclosed adapters for Blu-ray players， set-top boxes， games consoles， etc.

圖4.演示板DEMO_5ASAG_60W1外形圖

演示板DEMO_5ASAG_60W1主要指標(biāo):

圖5.演示板DEMO_5ASAG_60W1電路圖

演示板DEMO_5ASAG_60W1材料清單:

圖6.變壓器結(jié)構(gòu)圖

圖7.演示板DEMO_5ASAG_60W1 PCB設(shè)計圖(1)

圖8.演示板DEMO_5ASAG_60W1 PCB設(shè)計圖(2)