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.