RediSem Ltd. Science Park Shatin Hong Kong Tel. +852 2607 4141 Fax. +852 2607 4140 Careers | Contact © Copyright 2025 RediSem Ltd.
RED2421 is an advanced LED controller IC for high efficiency low-cost LLC converters with bipolar transistors and integrated PFC, intended for high frequency CC LED drivers up to 22W and pin compatible with RED2401.
• Advanced LED Controller IC for high efficiency low-cost LLC converters with bipolar transistors and integrated PFC • PSR - +/-5% Primary Side Regulation of LED current and voltage with no flicker • 50% duty cycle, variable frequency control of resonant half-bridge • Automatic dead-time control and capacitive mode protection • Protection modes: a. Overload b. No-Load c. Over-temperature • Low output capacitance allows live LED connection • Very low output current ripple < 0.5% • Small SOT23-6 IC package
Datasheet  
Key Features
Order Details
• Code RED2421AL-TR7 • Package SOT23-6 Tape & Reel
•	22W 550mA Low Cost LED driver (2387kB) •	22W 550mA Low Cost LED driver (2387kB) Reference Design  Check Application Notes Check Application Notes Order Order Low Power LED Controller for LLC Converters RED2421
•	RED2421  (345kB)   •	RED2421  (345kB)     •	10W 250mA LED driver (1210kB)       •	10W 250mA LED driver (1210kB)  •	10W 250mA LED driver (1210kB) LED Driver ICs
RediSem Ltd. Science Park Shatin Hong Kong Tel. +852 2607 4141 Fax. +852 2607 4140 Careers | Contact © Copyright 2025 RediSem Ltd.
RED2421 is an advanced LED controller IC for high efficiency low- cost LLC converters with bipolar transistors and integrated PFC, intended for high frequency CC LED drivers up to 22W and pin compatible with RED2401.
• Advanced LED Controller IC for high efficiency low-cost LLC converters with bipolar transistors and integrated PFC • PSR - +/-5% Primary Side Regulation of LED current and voltage with no flicker • 50% duty cycle, variable frequency control of resonant half-bridge • Automatic dead-time control and capacitive mode protection • Protection modes: a. Overload b. No-Load c. Over-temperature • Low output capacitance allows live LED connection • Very low output current ripple < 0.5% • Small SOT23-6 IC package
Key Features
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