Off Line Switcher 7-Pin PDIP-C

TinySwitch-LT incorporates a 650 V power MOSFET, oscillator, high voltage switched current source, current limit (user selectable) and thermal shutdown circuitry. The IC family uses an ON/OFF control scheme and offers a design fl exible solution with a low system cost and extended power capability.

• Lowest System Cost with Enhanced Flexibility
  • 650 V rating optimized for non-active PFC applications
  • 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 effi ciency in enclosed adapters/chargers
  • Allows optimum TinySwitch-LT choice by swapping devices with no other circuit redesign
  • Tight I2f 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 fi lter costs
  • Pin-out simplifi es 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
  • Auto-restart delivers <3% of maximum power in short circuit and open loop fault conditions
  • Output overvoltage shutdown with optional Zener
  • 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 fi eld reliability
• EcoSmart®– Extremely Energy Effi cient
  • Easily meets all global energy effi ciency regulations
  • No-load <150 mW at 265 VAC without bias winding, <50 mW with bias winding
  • ON/OFF control provides constant effi ciency down to very light loads – ideal for mandatory CEC regulations