LNK605PG

The LNK605PG is an energy-efficient accurate CV/CC Switcher for adapters and chargers. 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 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.

• Eliminates optocoupler and all secondary CV/CC control circuitry
• Eliminates all control loop compensation circuitry
• Compensates for transformer inductance tolerances/input line voltage variations/cable voltage drop
• Compensates for external component temperature variations
• Very tight IC parameter tolerances using proprietary trimming technology
• Frequency jittering greatly reduces EMI filter
• Even tighter output tolerances achievable with external resistor selection/trimming
• Hysteretic thermal shutdown - Automatic recovery reduces power supply returns from the field
• No current sense resistors - Maximizes efficiency
• Programmable switching frequency up to 85kHz to reduce transformer size
• Auto-restart protection reduces power delivery by 95% for output short-circuit/control loop faults
• No-load consumption below 30mW at 230VAC with optional external bias winding