Powerint公司的DER275 30W高效电源解决方案是采用TOPSwitch-JX系列的TOP265KG，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，故障保护和其它控制电路。TOPSwitch-JX系列可提供10W-245W输出功率，265 VAC时无负载功耗低于100mW，具有多种扩展保护功能，主要用在笔记本电脑，通用适配器，打印机，LCD监视器，STB，PC或LCD TV待机和音频放大器。本文介绍了TOPSwitch-JX系列产品亮点，方框图，高效19V/65W和12V/30W的通用输入反激电源电路图，以及采用TOPSwitchTM-JX TOP265KG的高效30W电源参考设计主要指标，电路图，材料清单和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 Efficient

• 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 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 start-up 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:

• 43 W / 117 W universal input power output capability with PCB / metal heat sink

• 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:

• 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 profile surface mounted for ultra-slim designs

• Heat transfer to PCB via exposed pad and SOURCE pins

• Supports wave or reflow soldering

• Extended creepage to DRAIN pin

• Heat sink is connected to SOURCE for low EMI

TOPSwitch-JX系列应用：

• Notebook or laptop adapter

• Generic adapter

• Printer

• LCD monitor

• Set-top box

• PC or LCD TV standby

• Audio amplifier

图1。TOPSwitch-JX系列方框图

图2。高效19V/65W通用输入反激电源电路图

图3。高效12V/30W通用输入反激电源电路图

采用TOPSwitchTM-JX TOP265KG的高效30W电源参考设计

High Efficiency 30 W Standby Power Supply Using TOPSwitchTM-JX TOP265KG

This document is an engineering report describing standby power supply utilizing a TOPSwitch-JX TOP265KG. This power supply is intended as a general purpose evaluation platform that operates from 110 VDC to 400 VDC input and provides a 12 V,continuous 30 W output.

高效30W电源参考设计主要特性：

Highly energy efficient

Full load efficiency >89%

Efficiency >86% above 10% load

Average efficiency >89% (25%, 50%, 75%, 100% load points)

No-load input power <100 mW for input voltages <385 VDC

Simplifies meeting ENERGY STAR 2.0, 80 Plus 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

Surface mount low-profile eSOP package

Integrated protection and reliability features

Line undervoltage 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。高效30W电源参考设计外形图
高效30W电源参考设计指标：


图5。高效30W电源参考设计电路图
高效30W电源参考设计材料清单：



图6。变压器电路图

图7。高效30W电源参考设计PCB布局图
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/der275.pdf