LC5550LD Overview
LC5550LD series are PWM and quasi-resonant topology non-isolated buck LED driver ICs. They incorporate separate controller and power MOSFET chips, and are designed for input capacitorless applications. The controller adapts the average current control method for realizing high power factors.
LC5550LD Key Features
- PWM and quasi-resonant topology
- Integrated on-time control circuit (it realizes high power factor by average current control)
- Integrated soft-start circuit (reduces power stress during start-up on the incorporated power MOSFET and output rectifie
- Integrated bias assist circuit (improves startup performance, suppresses VCC voltage droop during operation, and allows
- Integrated Leading Edge Blanking (LEB) circuit
- Integrated maximum on-time limit circuit
- Protection features: ▫ Overcurrent protection (OCP): pulse-by-pulse ▫ Overvoltage protection (OVP): latched shutdown ▫ O