LYT7503D

LYTSwitch™-7 family phase-cut dimmable single-stage LED driver IC with combined PFC and constant current output for buck topology is ideal for single-stage, high PF, constant current LED dimmable applications. The family incorporates a high-voltage MOSFET with a variable on-time CrM controller. Extensive protection features with minimum external components provide industry leading power density and functionality. The CrM operation results in low turn-on losses and reduces cost of output diode (slower reverse-recovery type can be used). LYTSwitch-7 devices are suitable for applications from 4W to 22W. LYTSwitch-7 peak current mode operation is suitable for TRIAC applications without the need for an active bleeder. Over-temperature shutdown provides protection during fault conditions. Thermal foldback ensures that light continues to be delivered at elevated temperatures.

• Comprehensive protection features with auto-restart
• Single-stage PFC + accurate CC output, design flexibility, highest reliability
• ±3% CC regulation in single line input voltage applications, power factor <gt/>0.9, high efficiency <gt/>85%
• Robust 725V MOSFET for increased line voltage surge resistance, critical conduction mode (CrM) buck
• Low EMI, excellent line noise and transient rejection Fast turn-on (<lt/>500ms), low pop-on
• Better than 10:1 dimming ratio, simple passive R-C damper, monotonic dimming profile
• Wide input (90VAC – 308VAC) and output voltage range operation, requires no inductor bias winding
• 2 family members cover power range for optimum device selection
• Industry’s lowest component count dimming solution
• Advanced thermal control, input/output overvoltage protection, output short-circuit protection

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