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单级PFC原边恒流控制和TRIAC调光/非调光方案LNK405EG
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The LinkSwitch™-PH 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.
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