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| Power Integrations TOPSwitch-HX电源解决方案 | |||||
作者：TI 方案来源：TI 点击数： 更新时间：2007-12-27  |
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TOP254-258 TOPSwitch-HX Family TOPSwitch-HX cost effectively incorporates a 700 V power MOSFET, high voltage switched current source, PWM control, oscillator, thermal shutdown circuit, fault protection and other control circuitry onto a monolithic device. 产品亮点: Lower System Cost, Higher Design Flexibility Multi-mode operation maximizes effi ciency at all loads No heatsink required up to 35 W using P, G and M packageswith universal input voltage and up to 48 W at 230 VAC Output overvoltage protection (OVP) is user programmable for latching/non-latching shutdown with fast AC reset Allows both primary and secondary sensing Line undervoltage (UV) detection prevents turn-off glitches Line overvoltage (OV) shutdown extends line surge limit Accurate programmable current limit Optimized line feed-forward for line ripple rejection 132 kHz frequency (Y package) reduces transformer and power supply size Half frequency option in Y package for video applications Tight I2f parameter tolerance reduces system cost Maximizes MOSFET and transformer power delivery Minimizes overload power, reducing cost of transformer,primary clamp and secondary components Frequency jittering reduces EMI fi lter cost Improved auto-restart delivers <3% of maximum power in short circuit and open loop fault conditions Accurate hysteretic thermal shutdown function automatically recovers without requiring a reset Fully integrated soft-start for minimum start-up stress Pin-out simplifi es heatsinking to the PCB for P, G and M packages Extended creepage between DRAIN and all other pins improves field reliability Heatsink is connected to SOURCE for low EMI Energy efficient over entire load range No-load consumption <200 mW at 265 VAC Standby power for 1 W input >600 mW output at 110 VAC input >500 mW output at 265 VAC input  图1.采用Opto/TL/431反馈的TOPSwitch-HX反激电源方框图.  图2a.P和G封装的TOP254-258功能方框图.  图2C.Y封装的TOP254-258功能方框图.  图2b.M封装的TOP254-258功能方框图.  图3.采用TOP258PN的35W双输出电路图.  图4.采用TOP258YN的150W,19.5V电源电路图.  图5.采用TOP258MN的20W(连续),80W(峰值)通用输入电源电路图.  图6.采用TOP258PN的通用输入35W电源电路图. 详情请见: http://www.powerint.com/PDFFiles/tophx_family_datasheet.pdf 和应用手册 http://www.powerint.com/PDFFiles/an43.pdf |
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