Advanced Protection and Safety Features

• Auto-restart for short-circuit protection

• Open circuit fault detection mode

• Automatic thermal shutdown restart with hysteresis

• Meets high voltage creepage requirement between DRAIN and

all other signal pins both on PCB and at package

Description

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.