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基于TOP266EG的27W LCD監(jiān)視器電源設(shè)計(jì)方案
摘要: TOPSwitch-JX系列TOP266EG是高性價(jià)比器件,,它集成了725V功率MOSFET,,高壓開關(guān)電流源,,多模式PWM控制,,振蕩器,,熱關(guān)...
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TOPSwitch-JX 系列TOP266EG是高性價(jià)比器件,,它集成了725V 功率MOSFET,,高壓開關(guān)電流源,,多模式PWM控制,,振蕩器,熱關(guān)斷電路,,故障保護(hù)以及其它控制電路.265 VAC時(shí)無負(fù)載的功耗低于100 mW,,工作頻率132 kHz,降低了變壓器尺寸和電源的體積.本文介紹了TOPSwitch-JX 系列主要特性,,產(chǎn)品亮點(diǎn),,功能方框圖,以及65W 19V和30W 12V通用輸入反激電源電路圖,,27W LCD監(jiān)視器電源參考設(shè)計(jì)主要指標(biāo),,電路圖以及所用材料清單(BOM).

Power Supply Using TOP266EG

90 VAC–265 VAC Input; 5V, 2.5A and 14.5V, 1A Outputs

Application LCD Monitor

TOPSwitch-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 device.

TOP266EG產(chǎn)品亮點(diǎn):

• 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


 

 

圖1.TOP266EG 功能方框圖(E和V封裝)

 

圖2.采用TOP266EG的65W 19V通用輸入反激電源電路

 

圖3.采用TOP266EG的30W 12V通用輸入反激電源電路圖

27W LCD監(jiān)視器電源設(shè)計(jì)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.


 

 
圖4.27W LCD監(jiān)視器電源參考設(shè)計(jì)外形圖
    27W LCD監(jiān)視器電源參考設(shè)計(jì)指標(biāo):

 
    圖5.27W LCD監(jiān)視器電源參考設(shè)計(jì)電路

 

 

圖6.參考設(shè)計(jì)中的變壓器電方框圖

    27W LCD監(jiān)視器電源參考設(shè)計(jì)材料清單(BOM):
 

 
圖7.27W LCD監(jiān)視器電源參考設(shè)計(jì)PCB布局圖



 
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