Onsemi NCP1568 | Demoboard NCP1568DC48WGEVB

Description

The NCP1568 is a highly integrated ac−dc PWM controller designed to implement an active clamp flyback topology. NCP1568 employs a proprietary variable frequency algorithm to enable zero voltage switching (ZVS) of Super−Junction or GaN FETs across line, load, and output conditions. The ZVS feature increases power density of a power converter by increasing the operating frequency while achieving high efficiency. The Active Clamp Flyback (ACF) operation simplifies EMI filter design to avoid interference with other sensitive circuits in the system. The NCP1568 features a HV startup circuit, a strong low side driver, and a 5 V logic level driver for the active clamp FET. The NCP1568 is suitable for a variety of applications including ac−dc adapters, industrial, telecom, lighting, and other applications where power density is an important requirement. The NCP1568 also features multimode operation and transitions from ACF mode to Discontinuous Conduction Mode (DCM) to meet regulatory requirements from around the world. The NCP1568 further implements skip in standby mode, resulting in excellent standby power. The combination of flexible control scheme and user programmable features allow the use of NCP1568 with Super−Junction MOSFETs (Si) and Gallium Nitride (GaN) FETs.

Features

• Topology and Control Scheme
• Active Clamp Flyback Topology Aids in 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
• DCM and Light Load Operation
• 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 < 30 mW
• Integrated HV and Startup Circuits
• 700 V Startup Circuit
• AC Line Brownout Detect - Drivers
• 0.85 A/1.5 A Source/Sink for Low Side
• 65 mA/150 mA Active Clamp Driver Output
• Oscillator
• Programmable Frequency from 100 kHz to 1 MHz
• Internal Soft−Start Timer with 4 Options
• Protection
• Dedicated FLT Pin Compatible with a Thermistor
• Adjustable Over Power Protection (OPP)
• Option for Auto−Recovery and Latched in Various Faults
• Internal Thermal Shutdown

Typical applications

• USB Power Delivery, Notebook Adapters, High Density Chargers, Industrial Power Supplies

More information

• Datasheet
• IC product information