LNK605DG-TL

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 700V 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. It compensates for transformer inductance tolerances, input line voltage variations and external component temperature variations. Auto-restart protection reduces power delivered by <gt/>95% for output short-circuit and control loop faults (open and shorted components). Applications includes chargers for cell/cordless phones, PDAs, MP3/portable audio devices, adapters and LED drivers.

• Output power of 4.5W (adapter), 5.1W (open frame) at 85-265VAC
• Energy efficient, accurate CV/CC switcher for adapters and chargers
• Dramatically simplifies CV/CC converters, EcoSmart™ energy efficient
• Eliminates optocoupler, all secondary CV/CC control and all control loop compensation circuitry
• Very tight IC parameter tolerances using proprietary trimming technology
• Frequency jittering greatly reduces EMI filter cost, meets all global energy efficiency regulations
• Meets high-voltage creepage requirements between DRAIN and all other pins both on PCB and at package
• No-load consumption below 30mW at 230VAC with optional external bias winding
• ON/OFF control provides constant efficiency down to very light loads
• No current sense resistors, maximizes efficiency, hysteretic thermal shutdown