onsemi NCP1568 PWM controller

The NCP1568 is a highly integrated AC-DC PWM controller designed to implement an active clamp flyback topology.

It employs a proprietary variable frequency algorithm to enables zero voltage switching (ZVS) of the MOSFETs across line & load conditions. The ZVS feature allows high-frequency operation increasing the power density of a power converter while achieving high efficiency.

An HV startup circuit, a strong low side driver, and a 5V logic level driver for active clamp FET, including SJ FETs and GaN FETs, are integrated.

Key features

• Active clamp flyback topology
• Multi-mode operation and programmable control scheme
• Enables high power density designs
• Enhanced light load efficiency

Additional features

• Active clamp flyback topology aids in Zero Voltage Switching (ZVS)
• Proprietary multi-mode operation to enhance light load efficiency
• Proprietary adaptive ZVS allows high-frequency operation while reducing EMI
• Inbuilt adaptive dead-time for both main and active clamp FETs
• Peak current-mode control with inbuilt slope compensation with options
• Flexible control scheme and programmability allow for configuration with either external silicon or GaN FETs
• Customer programmable optional transition to DCM
• Integrated frequency foldback with minimum frequency clamp for highest performance in standby mode
• Minimum frequency clamp and quiet skip eliminates audible noise
• Standby power less than 30 mW
• Integrated high voltage and startup circuits
• Integrated drivers
• Programmable frequency from 100 kHz to 1 MHz
• A set of protection features

Applications

• AC-DC Power Conversion
• Industrial Power Supplies
• USB Type C Power Delivery
• High Density Notebook & Mobile Adapters