Power Integrations公司的LinkSwitchTM-HP系列是集成了控制器和高压(650V/725V)功率MOSFET的单片器件,采用连续导通模式 (CCM),初级调整(PSR),功率达90W,没有DCM的效率限制或可听见的噪音. 在230VAC时无负载时的功耗小于30mW,主要用在LCD监视器和TV,适配器,家用电器,嵌入式电源(DVD,STB)和工业电源.本文介绍了 LinkSwitch-HP系列产品亮点,方框图,适配器电路图以及采用LNK6766E的30W单输出反激转换器参考设计主要特性和指标,电路图,材料 清单和PCB布局图.

A LinkSwitch-HP device monolithically integrates a controller and high-voltage power MOSFET into one package. It has a newly developed analogue control scheme, which enables continuous conduction mode (CCM), primary side regulated (PSR) power supplies up to 90 W without the efficiency limitation of DCM or audible noise. It uses an enhanced peak current mode PWM control scheme with multi-mode operation. The multi-mode control engine uses the error amplifier output signal voltage at the COMPENSATION pin to set the operating peak current and switching frequency to maintain the output voltage in regulation as shown in Figure 5. For COMPENSATION pin voltages lower than VC(MCM) (typ. 1.25 V) the device enters multi-cycle modulation (MCM) with a fixed peak current of 25% of the programmed current limit. Several innovative improvements have been added to the peak current mode control to allow primary side regulated CCM operation with no instability. The device meets less than 30 mW input power with no-load at high-line (LNK67xx families).

It also offers extensive built-in features:

• External current limit selection

• Optional programmable shutdown delay time extension

• Optional remote On/Off

• Optional fast AC reset

• Primary-side sensed output overvoltage protection (OVP)

• Lost regulation protection during output overload or short-circuit (auto-restart)

• Internal current limit over line compensation for constant overload power over line

• High-voltage bus overvoltage sense (line OV) for extended line surge withstand

• High-voltage bus undervoltage sense (line UV) for brown-in/ out protection

• Accurate over-temperature protection (OTP)

• Output OVP/OCP/OTP shutdown type selection (hysteretic/ latching)

• Optional external latching shutdown input (current threshold)

• Cycle-by-cycle current limit control


EcoSmart™- Energy Efficient

• Multi-mode control maximizes efficiency over full load range

• No-load consumption below 30 mW at 230 VAC (LNK67xx)

• >75% efficiency with 1 W input at 230 VAC

• >50% efficiency with 0.1 W input at 230 VAC

High Design Flexibility for Low System Cost

• Dramatically simplifies power supply designs

• Eliminates optocoupler and all secondary control circuitry

• ±5% or better output voltage tolerance

• 132 kHz operation reduces transformer and power supply size

• Accurate programmable current limit

• Compensation over line limits overload power

• Frequency jittering reduces EMI filter cost

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

• 725 V MOSFET simplifies meeting derating requirements (LNK677x)

• 650 V MOSFET for lowest system cost (LNK676x/LNK666x)

• Fast transient response family option (LNK666x)

Extensive Protection Features

• Auto-restart limits power delivery to 3% during overload faults

• Output short-circuit protection (SCP)

• Output overload/over-current protection (OPP, OCP)

• Optional extended shutdown delay time

• Output overvoltage protection (OVP), hysteretic or latching

• Line brown-in/out protection (line UV)

• Line overvoltage (OV) shutdown extends line surge withstand

• Accurate thermal shutdown (OTP), hysteretic or latching

Advanced Green Package Options

• eSIP™-7C package:

• Vertical orientation for minimum PCB footprint

• Simple heat sink mounting using clip or adhesive pad

• eDIP™-12B package:

• Low profile through-hole mounted for ultra-slim designs

• Heat transfer to PCB via exposed pad or optional metal heat sink

• Extended creepage to DRAIN pin

• Heat sink is connected to SOURCE for low EMI

• Halogen free and RoHS compliant


• LCD Monitor and TV

• Adapter

• Appliances

• Embedded power supplies (DVD, set-top box)

• Industrial

图1. LinkSwitch-HP系列方框图

图2.通用输入30W 12V/2.5A适配器电路图



 Primary side regulated isolated flyback converter with ±5% regulation.

 132 kHz switching frequency for small transformer and output filter size

 Full load continuous conduction mode operation for improved efficiency and reduced output capacitor ripple currents

 Multimode operation maximizes efficiency over full load range

 Below 30 mW power consumption with 230 VAC.

 Extensive protection features including OVP, OTP, brown-in/out, line overvoltage, and lostregulation (auto-restart)
 Meets EN-550022 and CISPR-22 Class B conducted EMI with 5 dB margin.

 Meets IEC61000-4-5, 1 kV / 2 kV surge.

图3. 30W转换器参考设计外形图

图4. 30W转换器参考设计电路图

图5. 30W转换器参考设计变压器电路图

图6. 30W转换器参考设计PCB布局图:尺寸2.76” (70.1 mm) x 1.16” (29.4 mm)

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日前,Power Integrations公布了截至2016年9月30日的季度财务数据。2016年第三季度净营业额为1.038亿美元,与上季度环比增长7%,与2015年第三季度同比增长17%。第三季度净利为1420万美元,稀释每股收益为0.48美元;与之相比,上季度稀释每股收益为0.38美元,2015年第三季度稀释每股收益为0.39美元。第三季度运营中产生的现金流为2630万美元。


在初次设计电源之前,应确保电源所采用的印刷电路板符合Power Integrations器件数据手册中指定的布局指南。如果在实验用面包板或原始样板上搭建设计的电路,会引入很多寄生元件,这样会影响电源的正常工作。而且,许多实验用面包板都无法承载开关电源所产生的电流水平,并可能因而受损。此外,在这些电路板上非常难以控制爬电距离和电气间隙。


日前,Power Integrations公布了截至2016年6月30日的季度财务数据。2016年第二季度净营业额为9720万美元,与上季度环比增长14%,与2015年第二季度同比同样增长14%。净利为1130万美元,稀释每股收益为0.38美元;上季度稀释每股收益为0.30美元,2015年第二季度稀释每股收益为0.29美元。 第二季度运营中产生的现金流为2360万美元。

Power Integrations任命Thomas Simonis为大功率产品业务副总裁

Simonis先生在高压电机驱动器及半导体领域从业超过25年,加入Power Integrations之前,他先后在ATB、CPM和Infineon等数家知名公司担任技术及业务管理职务,是一名业内资深人士。Simonis先生是从退休的Wolfgang Ademmer手中接任该职的,Wolfgang Ademmer于2012年Power Integrations收购CT-Concept后加入公司。