NXP Semiconductors has announced the SSL2101, an integrated dimmable mains LED driver. The SSL2101 is a compact SMPS controller IC specifically designed to drive and dim LED devices. The SSL2101 is suitable for driving lighting systems with various power requirements, including LED retro-fit lamps, LED modules, LED spots, down-lights, and LED strings for retail displays.
The SSL2101 is fully compatible with current lighting infrastructures and can operate directly from rectified mains power or in combination with a phase-control dimmer. The SSL2101 includes a high-voltage power switch and can start up directly from the rectified mains voltage, so no external startup circuit is necessary. To support its dimming capabilities the SSL2101 contains two integrated high voltage switches for bleeder operation and an input that can be used to sense lamp power consumption and activate additional bleeder action when needed.
The SSL2101 supports non-isolated (buck) and isolated (flyback) applications. It has an additional input that can be used to detect demagnetisation of the inductive element, ensuring full utilisation of the magnetic material and preventing hard switching. The device has in-built circuitry to reduce capacitive switch-on losses and optimise valley switching efficiencies for improved effectiveness at low power levels. The SSL2101 uses duty cycle control and frequency control to adjust the LED brightness. The combination of these two methods produces a dimming curve similar to that of an incandescent lamp and reduces peak current levels.
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