USB-PD compatible, 94.5% power efficiency

ON Semiconductor has unveiled a new solution for world-class high-density power adapters used in laptops, tablets, and other portable devices that require compatibility with USB Power Delivery (PD) or Qualcomm Quick Charge standards.

This solution, currently undergoing multiple patent applications, consists of the active clamp flyback (ACE) controller NCP1568 and the corresponding high-speed half-bridge driver NCP51530. The 65W USB-PD compatible adapter provides power efficiency of up to 94.5% and a power density of 30W/in³.

The NCP1568 is a highly integrated AC-DC pulse width modulation (PWM) controller that implements an ACF topology with zero voltage switching (ZVS) for high-frequency applications (up to 1 MHz) requiring high power density and efficiency. Additionally, the NCP1658 controller can implement an ACF topology using proven Super Junction FETs or high-performance Gallium Nitride (GaN) FETs.

NCP1568-based solutions with high-voltage startups require almost no external components, which can reduce standby power consumption. Additionally, high-frequency operation reduces the size of passive components, dramatically improving power density. The ability to seamlessly switch to discontinuous conduction mode (DCM) improves efficiency under light load conditions, reducing standby power levels to less than 30 milliwatts (mW). Power supply designers can utilize this to pass global power efficiency regulatory standards. Adaptive ZVS frequency modulation provides variable output voltage that optimizes USB-PD and Quick Charge implementation.

Available in a compact TSSOP-16 package, the NCP1568 includes various protection features. Its 'quiet skip' function enables the elimination of audible noise during operation, a critical requirement for indoor power adapter applications.

The NCP51530A/B is a 700V high-frequency high-side and low-side driver that directly drives two N-channel power MOSFETs in high-performance power applications. Its fast dynamic response is a notable feature. A 30-nanometer propagation delay is ideal for high-frequency operation, and a 5-nanometer propagation delay matching ensures market-leading efficiency performance.

This device provides a highly robust solution with negative transient immunity and high dv/dt immunity up to 50 V/ns. It is available in SOIC-8 or DFN-10 packages, with the DFN-10 package offering improved creepage distance and exposed pads. An AEC-Q100 certified version is available in an SOIC-8 package for automotive applications.

Ryan Zahn, Marketing and Applications Manager for ON Semiconductor’s AC-DC Business Group, stated, “The newly unveiled solution represents a significant leap forward in the design of modern power adapters and battery chargers. The advanced features and flexible operation of the NCP1568 ACF controller provide outstanding efficiency while utilizing superjunction FETs, and because it requires virtually no external components, it enables high-density designs for USB-PD. The NCP51530 driver is a high-speed, high-performance power solution that includes an AEC Q-100 certification option for automotive applications.”