Highly Integrated
Dual-Mode Active Clamp
PWM Controller
NCP1566
The NCP1566 is a highly integrated dual−mode active−clam...
Highly Integrated
Dual-Mode Active Clamp
PWM Controller
NCP1566
The NCP1566 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 feedforward 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 NCP1566 has a line under
voltage detector, cycle−by−cycle current limiting, line
voltage dependent maximum duty ratio limit, over
voltage protection, and programmable overtemperature protection using an external thermistor. It also includes a dual−function FLT/SD pin used for communicating the presence of a fault but also for shutting down the controller. A dedicated dual−function synchronization pin eases operations when associating bricks together.
General Features
Support
Voltage Mode Control and Peak Current Mode Control Line Feedforward Adaptive Overlap time Control for Improved Efficiency Integrated 120−V High
Voltage Startup Circuit with Self−Supply
Operation
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