LNK420LG

The LinkSwitchPH 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 725 V power FET, a continuousmode 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.

• Dramatically Simplifies Off-line LED Drivers
• Single-stage combination of power factor correction and accurate constant-current (CC) output
• Enables very long lifetime designs (no electrolytic capacitors)
• Eliminates optocoupler and all secondary current control circuitry
• Eliminates control loop compensation circuitry
• Simple primary-side PWM dimming interface
• Universal input voltage range
• LNK403-410 optimized for flicker-free TRIAC dimming EcoSmart™ – Energy Efficient
• 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 (<50 mW at 230 VAC) Accurate and Consistent Performance
• Compensates for transformer inductance variations
• Compensates for line input voltage variation
• Frequency jittering greatly reduces EMI filter size and cost