Powerint DER229 27W LCD 监视器电源参考设计

Powerint公司的TNY375-380 TinySwitch-PK系列集成了700V MOSFET,振荡器,高压开关电流源,限流(用户选择)以及热关断电路.265VAC时没有偏压线圈空载功耗小于170mW,而有偏压线圈空载功耗小于60mW,主要用于高峰值/连续功率比的应用如DVD,PVR,音频放大器,调制解调器以及照片打印机等.本文介绍了TNY375-380 TinySwitch-PK系列的主要特性,方框图,几种应用电路以及27W LCD 监视器电源参考设计DER229 27W LCD 监视器电源参考设计,包括电路图和材料清单.

Low Profile, Low Standby Consumption 27 W Power Supply Using TNY380PN

TNY375-380 TinySwitch-PK Family

TinySwitch-PK incorporates a 700 V MOSFET, oscillator, highvoltage switched current source, current limit (user selectable), and thermal shutdown circuitry. A unique peak mode feature boosts current limit and frequency for peak load conditions. The boosted current limit provides the peak output power while the increased peak mode frequency ensures the transformer can be sized for continuous load conditions rather than peak power demands.

TNY375-380亮点:

Lowest System Cost with Enhanced Flexibility

Simple ON/OFF control, no loop compensation needed

Unique Peak Mode feature extends power range without increasing transformer size

Maximum frequency and current limit boosted at peak loads

Selectable current limit through BP/M capacitor value

Higher current limit extends maximum power in open frame

Lower current limit improves efficiency in enclosed adapters

Allows optimum TinySwitch-PK choice by swapping devices with no other circuit redesign

Tight I2f parameter tolerance reduces system cost

Maximizes MOSFET and magnetics power delivery

ON time extension – typically extends low line regulation range/hold-up time to reduce input bulk capacitance

Self-biased: no bias winding required for TNY375-376; winding required for TNY377-380

Frequency jittering reduces EMI filter costs

Optimized pin out eases pcb/external heatsinking

Quiet source-connected heatsink pins for low EMI

Enhanced Safety and Reliability Features

Accurate hysteretic thermal shutdown with automatic recovery provides complete system level overload protection and eliminates need for manual reset

Auto-restart delivers <3% maximum power in short circuit and open loop fault conditions

Output overvoltage shutdown with optional Zener

Line undervoltage detect threshold set using a single resistor

Very low component count enhances reliability and enables single sided printed circuit board layout

High bandwidth provides fast turn on with no overshoot and excellent transient load response

Extended creepage between DRAIN and all other pins improves field reliability

EcoSmart– Extremely Energy Efficient

Easily meets all global energy efficiency regulations

No-load <170 mW at 265 VAC without bias winding, <60 mW with bias winding

ON/OFF control provides constant efficiency down to very light loads – ideal for mandatory CEC efficiency regulations and 1 W

PC standby requirements

TNY375-380主要应用:

Applications with high peak-to-continuous power demands–DVDs, PVRs, active speakers (e.g. PC audio), audio amplifiers, modems, photo printers

Applications with high power demands at startup (large output capacitance or motor loads) - PC standby, low voltage motor drives


图1.TNY375-380方框图

图2.采用TNY376PN四输出7.5W13W(峰值)通用电压输入电源电路图.

图3.采用TNY380PN 230VAC输入20W连续45W(峰值)电源电路图

采用TNY380PN的小尺寸低待机功耗的27W电源参考设计DER-229

The power supply employs a TinySwitch-PK TNY380PN device (U1) with an integrated high-voltage MOSFET and a controller in a flyback configuration.

DER-229主要特性:

Low cost, low parts count solution

TinySwitch-PK TNY380PN-based solution

No heatsink required

Highly energy efficient

Very low standby consumption

Input power of 82 mW with 30 mW output load, 264 VAC input

Input power <100 mW at no-load, 230 VAC input

High full-load efficiency

>80% efficiency at 90 VAC

Temperature rise meets requirements of LCD monitors

TNY380PN plastic <78℃ (90 VAC, 60 Hz, 25℃ ambient)

Conducted EMI margin >8 dB

DER-229电源指标:



图4.DER-229电源外形图

图5.DER-229电源电路图

DER-229电源材料清单: