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.