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Powerint LNK6766E 30W单输出反激电源解决方案 免费猫

发布时间:2020-02-17 13:11:05 阅读: 来源:金属穿线管厂家

Powerint LNK6766E 30W单输出反激电源解决方案

Powerint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

LinkSwitch-HP系列产品亮点:

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

LinkSwitch-HP系列典型应用:

LCD Monitor and TV

Adapter

Appliances

Embedded power supplies (DVD, set-top box)

Industrial

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