infineon公司的ICE5QSAG是第五代准谐振PWM控制器,有源突发模式使得最低待机功率小于100mW,数字频率以达到较好的系统效率,具有众多的保护功能,主要用在家用电器/白色家电,TV,PC和服务器的辅助电源,蓝光播放器,机顶盒和LCD/LED监视器.本文介绍了ICE5QSAG产品亮点,功能框图,应用电路图以及采用ICE5QSAG和IPA80R650CE的 50 W 12 V 5 V SMPS演示板主要特性和指标,电路图,材料清单,变压器架构图和PCB设计图.
The Quasi-Resonant, ICE5QSAG is the 5th generation of quasi-resonant controller optimized for off-line switch power supply in cascode configuration. The improved digital frequency reduction with proprietary novel Quasi-Resonant operation offers lower EMI and higher efficiency for wide AC range by reducing the switching frequency difference between low and high line. The enhanced active burst mode enables flexibility in standby power range selection. The product has a wide operating range (10~25.5 V) of IC power supply and lower power consumption. The numerous protection functions including the robust line protection (both input OVP and brownout) to support the protections of the power supply system in failure situations. All of these make the ICE5QSAG an outstanding controller for Quasi-Resonant flyback converter in the market.
Novel Quasi-resonant operation and proprietary implementation for low EMI
Enhanced Active Burst Mode with selectable entry and exit standby power
Active Burst Mode to reach the lowest standby power <100 mW
Fast startup achieved with cascode configuration
Digital frequency reduction for better overall system efficiency
Robust line protection with input OVP and brownout
Pb-free lead plating, halogen free mold compound, RoHS compliant
Auxiliary power supply for Home Appliances/white Goods, TV, PC & Server
Blu-Ray player, Set-top box & LCD/LED Monitor
采用ICE5QSAG和IPA80R650CE的 50 W 12 V 5 V SMPS演示板
This application note is an engineering report for a 50 W 12 V and 5 V demo board designed in a QR Flyback converter topology using the 5th generation QR controller, ICE5QSAG and a MOSFET from the CE series of high voltage CoolMOS™ IPA80R650CE. The target applications for ICE5QSAG are auxiliary power supplies from white goods, PCs, servers and TVs or enclosed adapters, Blu-ray players, set-top boxes, game consoles, etc.
The novel and 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 power enables flexibility in standby power operation range selection and QR operation during active burst mode. As a result, the system efficiency over the entire load range, is significantly improved compared to conventional free running QR converters implemented with only maximum switching frequency limitation at light load.
In addition, numerous adjustable protection functions have been implemented in the ICE5QSAG to protect the system and customize the IC for the chosen application. In case of failure modes such as brownout or line over voltage, VCC over/under voltage, open control loop or overload, output overvoltage, over temperature, VCC short to ground or CS short to ground, the device enters a protection mode.
Due to the cycle-by-cycle peak current limitation, the dimension of the transformer and current rating of the secondary diode can both be optimized. Thus, a cost effective solution can easily be achieved.
图3.50 W 12 V 5 V SMPS演示板外形图
50 W 12 V 5 V SMPS演示板主要指标:
图4.50 W 12 V 5 V SMPS演示板电路图
50 W 12 V 5 V SMPS演示板材料清单:
图5.50 W 12 V 5 V SMPS演示板变压器架构图
图6.50 W 12 V 5 V SMPS演示板PCB设计图(顶层)
图7.50 W 12 V 5 V SMPS演示板PCB设计图(底层)