LNK420EG

LinkSwitch™-PH single-stage PFC, primary-side constant current control and TRIAC dimming/non-dimming options dramatically simplifies implementation of LED drivers requiring long lifetime, high efficiency, PF 0.9, and TRIAC dimming capability (LNK403-410). The single-stage combined power factor and constant-current controller eliminates a switching stage and the electrolytic bulk capacitor. The advanced primary-side control used by the LinkSwitch-PH device provides accurate constant current control while eliminating the need for an optocoupler and current sensing circuits. LinkSwitch-PH incorporates a 725V power FET, a continuous mode PWM controller, a high-voltage switched current source for self-biasing, frequency jittering, protection circuitry including cycle-by-cycle current limit and hysteretic thermal shutdown. Meets high voltage creepage requirement between DRAIN and all other signal pins both on PCB and at package. Typically used in off-line LED driver applications.

• Minimum output power of 18W at CBP = 10µF and 31W at CBP = 100µF (85-132VAC, RV = 2Mohm)
• Dramatically simplifies off-line LED drivers, EcoSmartâ„¢ energy efficient
• Accurate and consistent performance, advanced protection and safety features
• Auto-restart for short-circuit protection, open circuit fault detection mode
• Single-stage combination of power factor correction and accurate constant-current (CC) output
• Simple primary-side PWM dimming interface, universal input voltage range
• Single-stage PFC combined with output CC control
• Greatly increases efficiency, 90% achievable, reduces component count, no current sense resistors
• Low standby power remote ON/OFF feature (50mW at 230VAC)
• Compensates for transformer inductance variations, compensates for line input voltage variation