Power Integrations Off Line Switcher DIP8 9.5W Flyback

The Power Integrations Off Line Switcher integrates a 700V power MOSFET, oscillator, high voltage switched current source, current limit, and thermal shutdown circuitry onto a single 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.

This advanced switcher incorporates auto-restart, line undervoltage sense, and frequency jittering. An innovative design minimises audio frequency components within the simple ON/OFF control scheme to practically eliminate audible noise when using standard taped or varnished transformer construction. The fully integrated auto-restart circuit safely limits output power during fault conditions such as output short circuits or open loops, significantly reducing component count and secondary feedback circuitry cost.

Key Features

• Fully integrated auto-restart for short circuit and open loop fault protection
• Built-in circuitry practically eliminates audible noise with ordinary dip-varnished transformers
• Programmable line undervoltage 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 required
• Simple design practically eliminates rework in manufacturing
• No load consumption of less than 50mW with bias winding and less than 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

Measuring 40 mm in height, 30 mm in width, and 25 mm in depth, with an ultra-light