Интегрална схема TNY278PN → Обява 42661709

Високоефективен преобразовател с мощност 1-20W (с радиатор) използван

основно в компютърни захранвания за осигуряване на 5v STAND BY

напрежение

Off-Line Switcher with

Enhanced Flexibility and Extended Power Range

TNY274-280

TinySwitch-III Family

Energy Efficient, Off-Line Switcher with

Enhanced Flexibility and Extended Power Range

Lowest System Cost with Enhanced Flexibility

• Simple ON/OFF control, no loop compensation needed

• Selectable current limit through BP/M capacitor value

- Higher current limit extends peak power or, in open

frame applications, maximum continuous power

- Lower current limit improves efficiency in enclosed

adapters/chargers

- Allows optimum TinySwitch-III choice by swapping

devices with no other circuit redesign

• Tight I 2 f parameter tolerance reduces system cost

- Maximizes MOSFET and magnetics power delivery

- Minimizes max overload power, reducing cost of

transformer, primary clamp & secondary components

• ON-time extension – extends low line regulation range/

hold-up time to reduce input bulk capacitance

• Self-biased: no bias winding or bias components

• Frequency jittering reduces EMI filter costs

• Pin-out simplifies heatsinking to the PCB

• SOURCE pins are electrically quiet for low EMI

Enhanced Safety and Reliability Features

• Accurate hysteretic thermal shutdown protection with

automatic recovery eliminates need for manual reset

• Improved auto-restart delivers 3% of maximum power

in short circuit and open loop fault conditions

• Output overvoltage shutdown with optional Zener

• Line under-voltage detect threshold set using a single

optional 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 150 mW at 265 VAC without bias winding,

50 mW with bias winding

• ON/OFF control provides constant efficiency down to

very light loads – ideal for mandatory CEC regulations

and 1 W PC standby requirements

Applications

• Chargers/adapters for cell/cordless phones, PDAs, digital

cameras, MP3/portable audio, shavers, etc.