Triac dimmable LED lamp driver offers cost savings

August 21, 2014 // By Paul Buckley
Diodes Incorporated has introduced the AP1695 LED lamp driver which optimizes the design of sub 12 W triac dimmer-compatible LED lamps by featuring a dimming range of 1 to 100% and a 30% reduction in bill of materials cost.

For 120 V and 230 V mains-dimmable retrofit LED lamps such as the common 5 W GU10 and 8 W energy saver bulbs, the high-performance AP1695 uses a patented constant on-time control technique to enable deep triac dimming down to 1% and an increase in lamp/triac compatibility. The device's dimming curve complies with the NEMA SSL6 standard and the driver is fully compliant with the requirements of the IEC6100-3-2 harmonic standard.

The AP1695 is a single-stage driver integrating a 500 V high-voltage MOSFET into the space-saving SO-7 package. This device employs PFM technology to tightly regulate output current up to a 230 mA (max), while maintaining a power factor higher than 0.9 and a THD rating less than 30%. Its boundary-conduction mode ensures higher efficiency and enhanced EMI performance.

By operating on the primary side, the device removes the need for opto- couplers, secondary-side control and loop-compensation circuitry without compromising application stability. The AL1695 also has the following integrated protection features: over-voltage, short-circuit and over-temperature protection.