Primary-side switcher

8 October 2014 Power Electronics / Power Management

Diodes Incorporated has announced the AP3988 off-line, side-switching controller designed to cut costs and improve power supply performance in chargers, ADSL adaptors and home appliances. By providing primary-side control, the device eliminates the requirement for optocouplers and secondary-side control circuitry, reducing component count, board space requirements and cost.

Primary-side regulation results in higher efficiency with less heat generated in the power supply, which increases reliability. Additional benefits include improved output voltage and current accuracy, enhanced over-voltage and short circuit protection, and better EMC performance achieved by frequency dithering.

The AP3988 regulates output voltage using piece-wide pulse frequency modulation, in which analog levels are represented as fixed-duration pulses of varying repetition rate. Transistors with 700 VCBO are built into the device and startup current is typically just 0,2 μA.

The chip has integral cable voltage drop compensation of 5% of nominal voltage and adjustable line voltage compensation. It is designed for use in 5,5 W adaptors and is offered in the SO-7 package.

For more information contact Arnold Perumal, Avnet Kopp, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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