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基于TOP265EG設(shè)計的30W待機(jī)電源方案

作者: 時間:2010-06-09 來源:網(wǎng)絡(luò) 收藏
TOPSwitch-JX系列(TOP264-271)集成了725V功率MOSFET,高壓開關(guān)電流源,多模式PWM控制,熱關(guān)斷電路,故障保護(hù)和其它控制電路, 265 VAC電壓下無負(fù)載的功耗低于100mW.本文介紹了TOPSwitch-JX系列(TOP264-271)主要特性, 方框圖, 通用輸入高效19V 65W反激電路圖和采用的12V 高效案例的電路圖和所用材料清單.

TOPSwitch-JX TOP264-271 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.

TOPSwitch-JX 系列主要特性:

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)

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.TOPSwitch-JX系列功能方框圖(E 和V 封裝).

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