Overview: DATA SHEET .onsemi. Highly Integrated Dual-Mode Active Clamp PWM Controller
NCP1565
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 tele and data 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 FLT/SD pin used for municating the presence of a fault but also for shutting down the controller.
