LNK6448E

The LinkSwitch-3 family of ICs 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 accurate output voltage and current regulation, compensating for transformer and internal parameter tolerances along with input voltage variations.

The device incorporates a 725 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.

Product Highlights

Dramatically Simplifies CV/CC Converters

• Eliminates optocoupler and all secondary CV/CC control circuitry
• Eliminates all control loop compensation circuitry

Advanced Performance Features

• Compensates for transformer inductance tolerances, input line voltage variations, and cable voltage drop
• Very tight IC parameter tolerances using proprietary trimming technology
• Frequency jittering greatly reduces EMI filter cost
• Programmable switching frequency up to 85 kHz to reduce transformer size
• Minimum operation frequency fixed to improve transient load response

Advanced Protection/Safety Features

• 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

EcoSmart– Energy Efficient

• Easily meets all global energy efficiency regulations with no added components
• No-load consumption at 230 VAC input with bias winding <30 mW

Green Package

• Halogen free and RoHS compliant package