The LNK606DG 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.
Feature
- 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
