May 13, 2022 - Onsemi (Nasdaq: ON), a leader in smart power and intellisense technologies, has launched a new three-piece product for USB Power Delivery (PD) designs. The new controllers and drivers offer innovative features that significantly reduce the bill of material (BOM) content of energy-efficient AC-DC power supplies, especially in the load range above 100W.

"USB PD is an important and growing application, but meeting its energy efficiency and size requirements is a serious challenge for designers," said Shane Chilton, senior director of ON Semiconductor‘s Power Conversion Solutions Division. "With our new product, designers can Removing up to 15 devices from the existing BOM reduces design cost while ensuring that the stringent energy efficiency and performance standards for USB PD applications are met."

The NCP1345 is a quasi-resonant (QR) flyback controller for high-performance offline power supplies and USB Type-C PD fast charging. High frequency QR operation (up to 350 kHz) reduces the size of the magnetics. Due to the built-in constant output current limit, the NCP1345 is compatible with limited power supply (LPS) requirements, while the fast frequency flyback feature ensures excellent light load efficiency.

Another new product from ON Semiconductor, the NCP1623, is a small-sized boost power factor correction (PFC) controller with a rated power of 300 W, which is used in USB PD fast charging adapters and computer power supplies. The device operates in critical conduction mode (CrM) at heavy loads and then enters discontinuous conduction mode (DCM) as the load decreases to maximize energy efficiency at both rated and light loads. The NCP1623 improves energy efficiency to 2% at low input voltages, consumes <100 μA in sleep mode, and optimizes the no-load input power state.

The NCP4307 is a high performance driver that can be used with synchronous rectification (SR) MOSFETs in a variety of high performance switching power supply topologies. The device will be self-powered from an internal 200V CS pin for high-side configuration and low VOUT without the need for an auxiliary power supply. Dual VCC pins select the best VCC source to minimize losses, thereby optimizing designs for wide-range VOUT applications.