Onsemi NCP1568 | Demoboard DN05119/D

Description

This design note describes a 60 W universal input 5 V, 9 V, 15 V and 20 V output ultra-high density power supply for laptop adapters. This featured power supply is an active-clamp flyback topology utilizing ON Semiconductor’s NCP1568 PWM controller, NCP51530 HB Driver, NCP4306 SR Controller and FDMS86202 SR FET. This design note provides complete circuit schematic, PCB, BOM and transformer information of the evaluation board. It also provide efficiency, transient response, output ripple and thermal data of the evaluation board.This design utilized NCP1568 and NCP51530 for the active-clamp flyback topology. Active-clamp flyback topology effectively recycles the leakage energy. Another feature of this topology is the ZVS operation of the power MOSFETS. Because of no leakage losses and ZVS operation, this topology is suited for high frequency operation which results in size reduction of the transformer. Hence active-clamp flyback topology is well suited for high power density sub 100 W power supplies. A ZVS fixed switching frequency power converter also simplifies EMI design and can be easily designed to avoid interference with other sensitive circuits in the system.

Features

• Universal AC input operation (90 - 265 Vac)
• High full load and average efficiency
• Low standby power
• Very low ripple and noise
• High frequency operation up to 450 kHz
• Inherent SCP and OCP protection
• Thermal and OVP protection
• Adaptive frequency operation based on AC input and output load conditions
• Adaptive ZVS operation
• Smaller EMI components
• Smooth startup operation

Typical applications

• AC-DC Power Conversion, USB Power Delivery

More information

• Datasheet