Lowest System Cost with Enhanced Flexibility
• Simple ON/OFF control, 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 ef?ciency in enclosed
adapters/chargers
- Allows optimum TinySwitch-III choice by swapping
devices with 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: bias winding or bias components
• Frequency jittering reduces EMI ?lter costs
• Pin-out simpli?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
• 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 overshoot
and excellent transient load response
• Extended age between DRAIN and all other pins
improves ?eld reliability.
Ecoart
®
– Extremely Energy Ef?cient
• Easily meets all global energy ef?ciency regulations
• -load <150 mW at 265 VAC without bias winding,
<50 mW with bias winding
• ON/OFF control provides constant ef?ciency down to
very light loads – ideal for mandatory CEC regulations
and 1 W PC standby requirements
