Electronic Products & Technology

High frequency ac-dc controllers and drivers improve industrial design

May 13, 2022  Stephen Law

ONSEMI NCP1345, NCP1623, NCP4307 controllers and driver incorporate innovative features that dramatically reduce BOM content of high efficiency ac-dc power supplies, specifically for load ranges above 100W.

NCP1345 Quasi-Resonant (QR) flyback controller for high-performance off-line power supplies and USB Type-C PD fast charging applications. The high frequency QR operation (up to 350 kHz) allows the size of magnetic components to be reduced. Device is compatible with the Limited Power Source (LPS) requirement due to the inbuilt constant output current limit while rapid frequency foldback features ensure excellent light load efficiency.

NCP1623 small form factor Boost Power Factor Correction (PFC) controller rated up to 300W for USB PD fast charging adapters and computing power supplies. Device operates in critical conduction mode (CrM) at heavy loads before entering discontinuous conduction mode (DCM) as the load decreases maximizing the efficiency at both nominal and light loads. Device can increase efficiency up to 2% at low input voltages and  offers a sleep mode of <100μA optimizing the no load input power state.

NCP4307 high performance driver for use with synchronous rectification (SR) MOSFETs in multiple high performance switch mode power supplies  topologies. Device will self-supply from an internal 200V CS pin, enabling high side configuration and low VOUT without requiring an auxiliary supply. The dual VCC pin selects the optimal VCC source to minimize losses, thereby optimizing designs for wide range VOUT applications.

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