Powerint公司的DER275 30W高效電源解決方案是采用TOPSwitch-JX系列的TOP265KG，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，故障保護和其它控制電路。TOPSwitch-JX系列可提供10W-245W輸出功率，265 VAC時無負載功耗低于100mW，具有多種擴展保護功能，主要用在筆記本電腦，通用適配器，打印機，LCD監(jiān)視器，STB，PC或LCD TV待機和音頻放大器。本文介紹了TOPSwitch-JX系列產(chǎn)品亮點，方框圖，高效19V/65W和12V/30W的通用輸入反激電源電路圖，以及采用TOPSwitchTM-JX TOP265KG的高效30W電源參考設(shè)計主要指標，電路圖，材料清單和PCB布局圖。

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系列產(chǎn)品亮點：

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系列應(yīng)用：

• Notebook or laptop adapter

• Generic adapter

• Printer

• LCD monitor

• Set-top box

• PC or LCD TV standby

• Audio amplifier

圖1。TOPSwitch-JX系列方框圖

圖2。高效19V/65W通用輸入反激電源電路圖

圖3。高效12V/30W通用輸入反激電源電路圖

采用TOPSwitchTM-JX TOP265KG的高效30W電源參考設(shè)計

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電源參考設(shè)計主要特性：
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Highly energy efficient
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Full load efficiency >89%
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Efficiency >86% above 10% load
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Average efficiency >89% (25%, 50%, 75%, 100% load points)
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No-load input power <100 mW for input voltages <385 VDC
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Simplifies meeting ENERGY STAR 2.0, 80 Plus and EuP requirements
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Low cost, low component count and small PCB footprint solution
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Performance met without synchronous output rectification
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132 kHz operation optimized core size and efficiency performance
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Surface mount low-profile eSOP package
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Integrated protection and reliability features
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Line undervoltage lock out (UVLO)
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Primary sensed output overvoltage shutdown (OVP). Latched OVP condition can be reset with a fast AC reset circuit.
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Auto recovery output over current (OCP)
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Meets limited power source (LPS) <100 VA requirement with a single point of failure
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Accurate thermal shutdown with large hysteresis

圖4。高效30W電源參考設(shè)計外形圖
高效30W電源參考設(shè)計指標：


圖5。高效30W電源參考設(shè)計電路圖
高效30W電源參考設(shè)計材料清單：



圖6。變壓器電路圖

圖7。高效30W電源參考設(shè)計PCB布局圖
詳情請見：
http://www.powerint.com/sites/default/files/product-docs/topjx_family_datasheet.pdf
和
http://www.powerint.com/sites/default/files/PDFFiles/der275.pdf