60W隔离反激开关电源(SMPS)电路图详解

infineon公司的ICE5QR0680AG是第五代PWM控制器,集成了高压700 V和800 V超级结MOSFET和内部电流稳压器,具有快速起动性能,主要用在离线开关电源(SMPS),适配器,机顶盒,水/空气净化器和TV主电源,空调,冰箱,服务器,PC电源和音频的辅助电源.本文介绍了ICE5QR0680AG主要特性和优势,60W隔离反激开关电源(SMPS)电路图以及采用ICE5QR0680AG的42W双输出12V和5V SMPS准谐振演示板主要特性和优势,主要指标,电路图,材料清单和PCB设计图.

To achieve fast start-up performance, 5th generation controller utilize the high voltageMOSFET together with an internal current regulator to operate the start-up sequence in a safe and rapid manner, which is commonly known as cascode configuration.

Upsized zero crossing counters for valley detection

With the implementation of 10 zero crossing counters, the ability to detect AC line input level and an intelligent adaptive digital algorithm (patent pending), it enabled the 5th generation controller to minimize the spread of switching frequency under different AC line input conditions. This innovative approach has enabled SMPS designers to designwith higher switching frequency to take advantage of smaller magnetics and lowering ofsystem BOM cost.

Run cooler with CoolMOSTM P7 family

In tandem with Infineon’s leadership in the area of high voltage superjunction MOSFETs,the latest 700 V and 800 V CoolMOS™ P7 families will be integrated together with the 5th generation controller in a single package.CoolSETTM is available in both through-holeand SMD packages and thereby eliminates the need of heatsink and reduces BOM countwith a small footprint.

Comprehensive suite of protection features

In addition to the typical output protection such as output short, overload and overvoltage protection, the 5th generation controller is incorporating additional protections todetect abnormal line input conditions such as over-voltage and under-voltage protection.Similarly, in-system-protection has been further enhanced with the introduction ofVCC and CS pin short to ground to prevent controller damage during abnormal start-upconditions and OTP has been enhanced with hysteresis to improve operational fault handling. To minimize interruption to system operation, all protection modes areimplemented with auto resume to enhance user experience.

ICE5QR0680AG主要特性:

››Integrated 700 V and 800 Vsuperjunction MOSFET withavalanche capability
››Comprehensive suite of protectionwhich include input OVP, brownin/out, pin short to GND and OTPwith hysteresis
››Innovative quasi-resonant switchingscheme to minimize frequencyspread under different line inputconditions
››High efficiency with latestCoolMOSTM P7 family andquasi-resonant switching scheme
››Auto-restart recovery scheme tominimize interruption to systemoperation
››Extensive protection coverage toincrease system robustness
››Rapid start-up performance withcascode configuration

ICE5QR0680AG主要优势:

››High efficiency with latestCoolMOSTM P7 family andquasi-resonant switching scheme
››Auto-restart recovery scheme tominimize interruption to systemoperation
››Extensive protection coverage toincrease system robustness
››Rapid start-up performance withcascode configuration

图1.采用ICE5QR0680AG的60W隔离反激开关电源(SMPS)电路图

采用ICE5QR0680AG的42W双输出12V和5V SMPS准谐振演示板

This document is an engineering report that describes a universal-input 42 W 12 V and 5 V off-line flyback converter using the latest 5th generation Infineon QR CoolSET™ ICE5QR0680AG. It offers high-efficiency, low-standby power with selectable entry and exit standby power options, wide V CC operating range with fast start-up, robust line protection with input Over Voltage Protection (OVP), and brownout and various modes of protection for a highly reliable system. This demo board is designed for users who wish to evaluate the performance of ICE5QR0680AG and its ease of use.

This AN is an engineering report for a 42 W 12 V and 5 V demo board designed in a QR flyback converter topology using the 5th generation QR CoolSET™ ICE5QR0680AG. The target applications of ICE5QR0680AG are either auxiliary power supplies for white goods, PCs, servers or TVs, or enclosed adapters for Blu-ray players, set-top boxes, games consoles, etc. With the CoolMOS™ integrated into this IC, it greatly simplifies the design and layout of the PCB. The new improved digital frequency reduction with proprietary QR operation offers lower EMI and higher efficiency for a wide AC range by reducing the switching frequency difference between low- and high-line. The enhanced Active Burst Mode (ABM) power enables flexibility in standby power operation range selection, and QR operation during ABM. As a result, the system efficiency over the entire load range is significantly improved compared to a conventional free-running QR converter implemented with only maximum switching frequency limitation at light loads. In addition, numerous adjustable protection functions have been implemented in ICE5QR0680AG to protect the system and customize the IC for the chosen application. In case of failure modes such as brownout or line over-voltage, V CC over-/under-voltage, open control-loop or over-load, output over-voltage, over-temperature, V CC short-to-ground and Current Sense (CS) short-to-ground, the device enters protection mode. By means of the cycle-by-cycle Peak Current Limitation (PCL), the dimensions of the transformer and the current rating of the secondary diode can both be optimized. Thus, a cost-effective solution can easily be achieved.

The DEMO_5QR0680AG_42W1 demostration board operates under a wide range input developed for offline SMPS applications. The board features the new ICE5QR0680AG PWM Quasi ResoantFlybackCoolSET™ with 800V integrated MOSFET in DSO-12 package.

42W双输出12V和5V SMPS演示板5QR0680AG_42W1主要特性:

Isolated flyback topology with dual output
Wide-range input rannginggtom from 85Vac to ~300Vac
Output #1: 12V/3.41A
Output #2: 5V/0.2A
42W双输出12V和5V SMPS演示板5QR0680AG_42W1优势:
High efficiency with quasi resonant switching
Cost-efficient solution for robust protection against line fault
42W双输出12V和5V SMPS演示板5QR0680AG_42W1目标应用:
Offline SMPS
Adapter
Main power for set-top box, water/air purifier and TV
Auxiliary power supply for aircon, refrigerator, server, PC power and audio

图2.42W双输出12V和5V SMPS演示板5QR0680AG_42W1外形图
演示板5QR0680AG_42W1主要指标:

图3.演示板5QR0680AG_42W1电路图
演示板5QR0680AG_42W1材料清单:

图4.演示板5QR0680AG_42W1 PCB设计图(T)

图5.演示板5QR0680AG_42W1 PCB设计图(B)