LYTSwitch enables high-performance low-profile isolated T8 LED-tube driver


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The DER-338 describes a low profile T8 (<10 mm component height), isolated, high power factor (PF) LED driver reference design from Power Integrations designed to drive a nominal LED-string voltage of 50 V at 430 mA from an input voltage range of 90 VAC to 135 VAC. The LED driver utilizes the LYT4215E from the LYTSwitch™ family of ICs. Features and benefits include: Low solution cost Combines PFC and PSR controlled CC into a single switching stage Single-sided PCB Low component count PF >0.98, THD <15% Integrated protection and reliability features Output open circuit / output short-circuit protected with auto-recovery Line input overvoltage shutdown extends voltage withstand during line faults High power factor and low THD is achieved by employing the LYTSwitch IC, which also provides a sophisticated range of protection features including auto-restart for open control loop and output short-circuit conditions. Power Integrations