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基于TOP266EG的27WLCD监视器电源设计方案

发布时间:2020-07-21 18:09:19 阅读: 来源:扎口机厂家

TOPSwitch-JX 系列TOP266EG是高性价比器件,它集成了725V功率MOSFET,高压开关电流源,多模式PWM控制,振荡器,热关断电路,故障保护以及其它控制电路.265 VAC时无负载的功耗低于100 mW,工作频率132 kHz,降低了变压器尺寸和电源的体积.本文介绍了TOPSwitch-JX 系列主要特性,产品亮点,功能方框图,以及65W 19V和30W 12V通用输入反激电源电路图,27W LCD监视器电源参考设计主要指标,电路图以及所用材料清单(BOM).Power Supply Using TOP266EG90 VACC265 VAC Input; 5V, 2.5A and14.5V, 1A OutputsApplication LCD MonitorTOPSwitch-JX cost effectively incorporates a 725 V power MOSFET, high voltage switched current source, multi-mode PWM control, oscillator, thermal shutdown circuit, fault protection and other control circuitry onto a monolithic P266EG产品亮点: EcoSmart® - Energy Efficient Energy efficient over entire load range No-load consumption below 100 mW at 265 VAC Up to 750 mW standby output power for 1 W input at 230 VAC High Design Flexibility for Low System Cost Multi-mode PWM control maximizes efficiency at all loads 132 kHz operation reduces transformer and power supply size 66 kHz option for highest efficiency requirements Accurate programmable current limit Optimized line feed-forward for line ripple rejection Frequency jittering reduces EMI filter cost Fully integrated soft-start for minimum startup stress 725 V rated MOSFET Simplifies meeting design derating requirements Extensive Protection Features Auto-restart limits power delivery to 3% during overload faults Output short-circuit protection (SCP) Output over-current protection (OCP) Output overload protection (OPP) Output overvoltage protection (OVP) User programmable for hysteretic/latching shutdown Simple fast AC reset Primary or secondary sensed Line undervoltage (UV) detection prevents turn-off glitches Line overvoltage (OV) shutdown extends line surge withstand Accurate thermal shutdown with large hysteresis (OTP) Advanced Package Options eDIP-12 package: Low profile horizontal orientation for ultra-slim designs Heat transfer to both PCB and heat sink Optional external heat sink provides thermal impedance equivalent to a TO-220 eSIP®-7C package: Vertical orientation for minimum PCB footprint Simple heat sink mounting using clip provides thermal impedance equivalent to a TO-220 Extended creepage to DRAIN pin Heat sink is connected to SOURCE for low EMI图1.TOP266EG 功能方框图(E和V封装)图2.采用TOP266EG的65W 19V通用输入反激电源电路图图3.采用TOP266EG的30W 12V通用输入反激电源电路图27W LCD监视器电源设计方案This document is an engineering report describing a 5 V / 2.5 A, 14.5 V / 1 A power supply utilizing a TOP266EG. The TOP266EG is part of the TOPSwitch-JX IC family from Power Integrations. The document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, and performance data.图4.27W LCD监视器电源参考设计外形图

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