Primary-Side Constant Current Control
The LinkSwitch-PH dramatically simplifies implementation of LED
drivers requiring PF >0.9, TRIAC dimmer capability and high efficiency.
The single-stage PF and constant current controller eliminates passive circuitry required for power factor correction and electrolytic bulk capacitor.
The advanced primary-side control techniques used by the LinkSwitch-PH device provide accurate constant current control while eliminating the need for an
optocoupler and secondary-side current control circuitry.
LinkSwitch-PH incorporates a 725 V power MOSFET, a continuous-mode PWM controller, a high voltage switched current source for self biasing, frequency jittering, cycle-by-cycle
current limit and hysteretic thermal shutdown circuitry, all in a monolithic IC.
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