New AC/DC Controllers and Drivers with High Frequency designed for USB Power Delivery Solutions

onsemi has launched a trio of products for USB Power Delivery (PD) design that dramatically reduce BOM content of high-efficiency AC/DC power supplies, specifically for load ranges above 100W. The trio includes the NCP1345 Quasi-Resonant (QR) flyback controller, NCP1623 small form factor Boost Power Factor Correction (PFC) controller, and NCP4307 high-performance driver.

The NCP1345 controller is designed for high-performance off-line power supplies and USB Type-C PD fast charging applications. The high-frequency QR operation of up to 350 kHz allows the size of magnetic components to be reduced. This controller 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.

The NCP1623 PFC controller is rated up to 300W for USB PD fast charging adapters and computing power supplies. This 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. It can increase efficiency up to 2% at low input voltages and offers a sleep mode of <100μA optimizing the no-load input power state.

The NCP4307 driver is suitable for use with synchronous rectification (SR) MOSFETs in multiple high-performance switch-mode power supplies topologies. This 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.