POWER INTEGRATIONS LNK632DG-TL

The LNK632DG dramatically simplifes low power CV/CC charger designs by eliminating an optocoupler and secondary control circuitry. The device uses an ON/OFF control technique to provide very tight output voltage regulation, in addition to output current control ideal for battery charging applications. The combination of proprietary IC trimming and E-Shield™ transformer construction techniques enables Clampless designs with the LNK632DG when an external bias circuit is used. 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.

• Eliminates optocoupler and all secondary CV/CC control circuitry
• Eliminates all control loop compensation circuitry
• Enables Clampless™ designs
• Compensates for cable voltage drop
• Compensates for external component temperature variations
• Very tight IC parameter tolerances using proprietary trimming technology
• Frequency jittering greatly reduces EMI filter cost
• Auto-restart protection reduces power delivered by about 85% for output short-circuit and control loop faults (open and shorted components)
• Hysteretic thermal shutdown – automatic recovery reduces power supply returns from the field
• Easily meets all global energy efficiency regulations with no added components
• No-load consumption down to <30 mW at 230 VAC input with bias winding
• ON/OFF control provides constant efficiency down to very light loads – ideal for EISA and ENERGY STAR regulations
• No current sense resistors – maximizes efficiency
• Halogen free and RoHS compliant package

• Chargers for cell/cordless phones, PDAs, MP3/portable audio devices, adapters, etc.