onsemi Launches Energy Efficient USB Power Supply Scheme

     Onsemi launched a set of three new products for USB power supply (PD) design. The new controller and driver provide innovative functions, which can significantly reduce the bill of materials (BOM) content of energy efficient AC-DC power supply, especially in the load range above 100 W.

     Shane Chilton, senior director of onsemi Power Conversion Solutions Division, said, "USB PD is an important and growing application, but meeting its energy efficiency and size requirements is a serious challenge for designers. With our new product, designers can remove up to 15 devices from the existing BOM, reduce design costs, and ensure that the stringent energy efficiency and performance standards of USB PD applications are met."

     NCP1345 is a quasi resonant (QR) flyback controller, which is used for high-performance offline power supply and USB Type-C PD fast charging. High frequency QR operation (up to 350 kHz) can reduce the size of magnetic devices. Due to the built-in constant output current limit, the NCP1345 is compatible with the requirements of the Limited Power Supply (LPS), while the fast frequency return function ensures excellent light load energy efficiency.

     Another new product of onsemi NCP1623 is a small boost power factor correction (PFC) controller with a rated power of 300 W, which is used for USB PD fast charging adapter and computer power supply. The device operates in critical conductive mode (CrM) under heavy load, and then enters discontinuous conductive mode (DCM) with load reduction to maximize energy efficiency under rated load and light load. NCP1623 can improve energy efficiency to 2% at low input voltage, and power consumption in sleep mode is less than 100 μ A. Optimize the state of no-load input power supply.

     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 200 V CS pin to achieve the upper bridge configuration and low VOUT without requiring an auxiliary power supply. Dual VCC pins select the best VCC source end to minimize the loss, thus optimizing the design of wide range VOUT applications.