TRIAC Dimmable Non-Isolated Buck-Boost LED Controller with Active PFC

The SM1503 is a high efficiency step-up/down converter for driving high-brightness LEDs with the high power factor and accurate LED current in a single stage converter with integrated bleeder for TRIAC dimmer. The controller operates using Transition Mode (TM). It can reduce switching loss and improve converter efficiency. The SM1503 integrates power factor correction and multi protection functions in which the protection functions enhance system reliability and safety. It also provides undervoltage lock-out, overvoltage protection, short-circuit protection, open lamp detection, short lamp detection and over temperature protection. The SM1503 is available in a small SOIC-8L package. 

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