TNY266PN

The TNY266PN 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 TNY266PN incorporates auto-restart, line undervoltage sense, and frequency jittering. An innovative design minimises 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 cost.

• Fully integrated auto-restart for short circuit and open loop fault protection
• Built in circuitry practically eliminates audible noise with ordinary dip-varnished transformer
• Programmable line under voltage detect feature prevents power on/off glitches
• Frequency jittering dramatically reduces EMI (~10dB)
• 132kHz operation reduces transformer size
• Very tight tolerances and negligible temperature variation on key parameters
• Low component count switcher solution
• Simple ON/OFF control – no loop compensation needed
• No bias winding
• Simple design practically eliminates rework in manufacturing
• No load consumption <lt/>50mW with bias winding and <lt/>250mW without bias winding at 265VAC input
• 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

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