Driver for retrofit LED lamps

23 October 2013 Opto-Electronics

Diodes Incorporated has announced the AP1684, a power factor corrected AC-DC LED driver suiting a variety of offline LED lamp types, including E26, GU10, PAR and T8. Using pulse-frequency modulation technology and operating in boundary-conduction mode, this device provides tight current regulation to an accuracy of ±2%, while achieving a power factor of 0,97 and total harmonic distortion of less than 20%.

Helping to reduce circuit bill of materials cost, this primary-side driver removes the need for optocoupler, secondary-side control and loop-compensation circuitry. Driving an external bipolar junction transistor, the IC requires only a small external component count and coupled with its SO8 packaging, enables lamp designers to reduce PCB footprint and increase power density.

The driver keeps startup and operating currents low and uses dynamic base driver control and valley-mode switching to minimise transition loss and achieve high efficiency (typically 93%). The AP1684’s circuit protection features include over-voltage, short circuit and over-temperature facilities.

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

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