TOP249YN Power Integrations AC-DC Off-Line Switcher IC

TOP249YN Power Integrations AC-DC Off-Line Switcher IC 

The TOP249YN is a highly integrated AC-DC off-line switcher IC from Power Integrations’ TOPSwitch family, engineered to provide efficient, compact, and reliable switch-mode power supplies (SMPS). It combines a high-voltage power MOSFET, PWM controller, oscillator, soft-start, and full protection circuitry into a single device, reducing external components and simplifying power supply design.

Ideal for medium to high power AC-DC converters, the TOP249YN delivers high efficiency, low standby power consumption, and excellent reliability, making it widely used in adapters, chargers, consumer electronics, industrial power modules, and auxiliary power supplies.

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Applications

• AC-DC adapters and chargers
• Switch-mode power supplies (SMPS)
• Industrial control and automation power supplies
• Consumer electronics and home appliances
• LED power supplies
• TV, monitor, and set-top box power supplies
• Auxiliary and standby power supplies

Features

• Type: AC-DC off-line switcher IC with integrated MOSFET
• Manufacturer: Power Integrations
• Family: TOPSwitch
• Integrated high-voltage power MOSFET
• Wide AC input range: 85–265V AC (with proper design)
• High efficiency and low no-load / standby power consumption
• Built-in soft-start, current limiting, thermal shutdown, and over-voltage protection
• Auto-restart fault protection
• Frequency jittering for reduced EMI
• Requires minimal external components
• Package: TO-220 / eSIP-7 (YN package)
• High reliability and long service life

TOP249YN – Datasheet