The NCP1565 is a highly integrated dual-mode active-clamp PWM controller targeting next-generation high-density, high-performance and small to medium power level isolated dc-dc converters for use in telecom and datacom industries. It can be configured in either voltage mode control with input voltage feed-forward or peak current mode control. Peak current mode control may be implemented with input voltage feed forward as well. Adjustable adaptive overlap time optimizes system efficiency based on input voltage and load conditions.This controller integrates all the necessary control and protection functions to implement an isolated active clamp forward or asymmetric half-bridge converter. It integrates a high-voltage startup bias regulator. The NCP1565 has a line undervoltage detector, cycle-by-cycle current limiting, line voltage dependent maximum duty ratio limit, and programmable overtemperature protection using an external thermistor. It also includes a dual-function FLTSD pin used for communicating the presence of a fault but also for shutting down the controller.For complete datasheet please contact your local ON Semiconductor Sales office or Tim.Kaske@onsemi.com

• Both Voltage Mode Control and Current Mode Control
• Line feedforward
• Adaptive Overlap time Control
• Integrated 120 V HV Startup
• Programmable Line Undervoltage Lockout (UVLO) with Adjustable Hysteresis
• Cycle by Cycle Peak Current Limiting
• Overcurrent Protection Based on Average Current
• Programmable Duty Ratio Clamp
• Programmable Soft-Start
• Programmable Shutdown and Restart Delays
• Programmable External Overtemperature Protection Using Thermistor
• FLT/SD pin Used for Fault reporting and Shutdown Input
• Programmable Oscillator with 1.5 MHz Maximum Frequency
• Main Switch Drive Capability of -2 A/3 A
• Active Clamp Switch Drive Capability of -2 A/1 A
• Short Circuit Protection
• 5 V2% Voltage Reference
• VCC Range: from 6.5 V to 20 V