The TNY265PG is an enhanced energy-efficient low power offline Switcher with fully integrated auto-restart for short circuit and open loop fault protection. TinySwitch-II integrates a 700V power MOSFET, oscillator, high voltage switched current source, current limit and thermal shutdown circuitry onto a monolithic device. The start-up and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias winding and associated circuitry. In addition, the TinySwitch-II device incorporates auto-restart, line undervoltage sense and frequency jittering. An innovative design minimizes audio frequency components in the simple ON/OFF control scheme to practically eliminate audible noise with standard taped/varnished transformer construction. The fully integrated auto-restart circuit safely limits output power during fault conditions such as output short circuit or open loop, reducing component count and secondary feedback circuitry.
● Built-in circuitry practically eliminates audible noise with ordinary dip-varnished transformer
● Programmable line undervoltage detect prevents power ON/OFF glitches - Saves external components
● Frequency jittering dramatically reduces EMI
● Very tight tolerances and negligible temperature variation on key parameters eases design
● Lowest component count switcher solution
● Lower system cost than RCC, discrete PWM and other integrated/hybrid solutions
● Simple ON/OFF control - No loop compensation needed
● No bias winding
● Simple design practically eliminates rework in manufacturing
● High voltage powered - Ideal for charger
● High bandwidth provides fast turn-ON with no overshoot
● Current limit operation rejects line frequency ripple
● Built-in current limit and thermal protection improves safety
● Control circuit common, internally connected to output MOSFET source
● Output MOSFET source connection for high voltage return
● 5.8V Regulator and 6.3V shunt voltage clamp
