Advanced Performance Features
• Compensates for transformer inductance tolerances
• Compensates for input line voltage variations
• Compensates for cable voltage drop (LNK61X series)
• Compensates for external component temperature variations
• Very tight IC parameter tolerances using proprietary trimming
technology
• Frequency jittering greatly reduces EMI filter cost
• Even tighter output tolerances achievable with external resistor
selection/trimming
• Programmable switching frequency up to 85 kHz to reduce transformer
size
Advanced Protection/Safety Features
• Auto-restart protection reduces power delivered by >95% for output
short-circuit and control loop faults (open and shorted components)
• Hysteretic thermal shutdown – automatic recovery reduces power
supply returns from the field
• Meets high-voltage creepage requirements between DRAIN and all
other pins both on the PCB and at the package
Applications
• Chargers for cell/cordless phones, PDAs, MP3/portable audio
devices, adapters, LED drivers, etc.
Description
The LinkSwitch™-II dramatically simplifies low power CV/CC charger
designs by eliminating an optocoupler and secondary control circuitry.
The device introduces a revolutionary control technique to provide very
tight output voltage and current regulation, compensating for transformer
and internal parameter tolerances along with input voltage variations.
The device incorporates a 700 V power MOSFET, a novel ON/OFF control
state machine, a high-voltage switched current source for self biasing,
frequency jittering, cycle-by-cycle current limit and hysteretic thermal
shutdown circuitry onto a monolithic IC.