TNY276PN Off-line Switcher IC

The TNY276PN incorporates a 700 V power MOSFET, oscillator, high voltage switched current source, current limit (user selectable) and thermal shutdown circuitry.  Thus offers a design flexible solution with a low system cost and extended power capability. Unlike conventional PWM (pulse width modulator) controllers, it uses a simple ON/OFF control to regulate the output voltage. They initiate its operation and run on the power derived from the DRAIN voltage. Thereby eliminating the need for a transformer bias winding and the associated circuitry. Hence, it consume only about 80 mW at no load, from 265 VAC input. The IC family uses an ON/OFF control scheme also eliminates the need for loop compensation.

An off-line regulator designed as a comprehensive integrated circuit consisting all of the functions required to provide clean power to a tiny portable or handheld device. Alternatively, it can be utilised as part of a bigger SMPS or DC-DC converter. It also has a line-compensated excessive power protection system. As a result, across the full AC input voltage range, these devices drastically decrease the maximum overload power that may be given to the load. For high reflected voltage and high bus-voltage systems, the 700 V MOSFET simply allows for 80 percent de-rating. Meanwhile, with 5% load, it has an efficiency of more than 70%. As a result, designers are able to satisfy the demanding European standard specification requirements.

Applications

• Chargers/adapters for cell/cordless phones, PDAs, digital
• Cameras, MP3/portable audio, shavers, etc.
• PC Standby and other auxiliary supplies
• Supplies for appliances, industrial systems, metering, etc