PowerintTOP270VG100W小型反激电源解决方案

Powerint公司的TOPSwitch-JX系列产品集成了725V功率MOSFET,高压开关电流源,多模式PWM控制器,振荡器,热关断电路,故障保护和其它控制电路,适合用于10W-245W的电源.265VAC时无负载的功耗小于100mW,主要用在笔记本电脑适配器,打印机,LCD监视器,STB,PC或LCD TV待机电源,音频放大器.本文介绍了TOPSwitch-JX系列产品亮点,方框图, 19V 65W反激电源电路图和12V 30W反激电源电路图以及12V/24V 100W反激电源评估板主要特性和指标,电路图,变压器电路图与材料清单,PCB布局图.

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.

TOPSwitch-JX系列产品亮点:

EcoSmart – Energy Effi cient

? Ideal for applications from 10 W to 245 W

? 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 effi ciency at all loads

? 132 kHz operation reduces transformer and power supply size

? 66 kHz option for highest effi ciency requirements

? Accurate programmable current limit

? Optimized line feed-forward for line ripple rejection

? Frequency jittering reduces EMI fi lter cost

? Fully integrated soft-start for minimum start-up stress

? 725 V rated MOSFET

? Simplifi es 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:

? 43 W / 117 W universal input power output capability with

PCB / metal heat sink

? Low profi le 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:

? 177 W universal input output power capability

? Vertical orientation for minimum PCB footprint

? Simple heat sink mounting using clip provides thermal

impedance equivalent to a TO-220

? eSOP?-12 package:

? 66 W universal input output power capability

? Low profi le surface mounted for ultra-slim designs

? Heat transfer to PCB via exposed pad and SOURCE pins

? Supports wave or refl ow soldering

? Extended creepage to DRAIN pin

? Heat sink is connected to SOURCE for low EMI

TOPSwitch-JX系列典型应用:

? Notebook or laptop adapter

? Generic adapter

? Printer

? LCD monitor

? Set-top box

? PC or LCD TV standby

? Audio amplifi er

图1.TOPSwitch-JX系列方框图

图2.TOPSwitch-JX系列通用输入19V 65W反激电源电路图

图3.TOPSwitch-JX系列通用输入12V 30W反激电源电路图

12V/24V 100W反激电源评估板

This document is an engineering report describing a 12 V / 24 V, 100 W flyback DC-DC converter utilizing a TOP270VG from the TOPSwitch-JX family of ICs. This power supply is intended for use in an LCD TV with LED back light. The board requires +380 VDC input, supplied from the PFC stage in a typical TV design.

100W反激电源评估板主要特性:

? Highly energy efficient

? Full load efficiency >90%

? Efficiency >89% above 10% load

? Average efficiency >90% (25%, 50%, 75%, 100% load points)

? Simplifies meeting ENERGY STAR 2.0 and EuP requirements

? Low cost, low component count and small PCB footprint solution

? Performance met without synchronous output rectification
? 132 kHz operation optimized core size and efficiency performance

? Low profile eDIP?-12 package for ultra-slim designs

? Integrated protection and reliability features

? Line under voltage lock out (UVLO)

? Primary sensed output overvoltage shutdown (OVP). Latched OVP condition can be reset with a fast AC reset circuit.

? Auto recovery output over current (OCP)

? Meets limited power source (LPS) 100 VA requirement with a single point of failure

? Accurate thermal shutdown with large hysteresis

图4.100W反激电源评估板外形图
100W反激电源主要指标:


图5.100W反激电源评估板电路图
100W反激电源评估板材料清单(BOM):




图6.100W反激电源评估板PCB布局图(顶层)

图7.100W反激电源评估板PCB布局图(底层)

图8.变压器电路图
详情请见:
http://www.powerint.com/sites/default/files/product-docs/topjx_family_datasheet.pdf
和
http://www.powerint.com/sites/default/files/PDFFiles/der299.pdf