The NCP1252 controller offers everything needed to build cost−effective and reliable ac−dc switching supplies dedicated to ATX power supplies. Thanks to the use of an internally fixed timer, NCP1252 detects an output overload without relying on the auxiliary Vcc. A Brown−Out input offers protection against low input voltages and improves the converter safety. Finally a SOIC8 package saves PCB space and represents a solution of choice in cost sensitive project. Features • Peak Current Mode Control • Adjustable Switching Frequency up to 500 kHz • Jittering Frequency ±5% of the Switching Frequency • Latched Primary Over Current Protection with 10 ms Fixed Delay • Delayed Operation Upon Start−up via an Internal Fixed Timer • Adjustable Soft−start Timer • Auto−recovery Brown−Out Detection • UC384X−like UVLO Thresholds • Vcc Range from 9 V to 28 V with Auto−recovery UVLO • Internal 160 ns Leading Edge Blanking • Adjustable Internal Ramp Compensation • +500 mA / –800 mA Source / Sink Capability • Maximum 50% Duty Cycle: A Version • Maximum 80% Duty Cycle: B Version • Ready for Updated No Load Regulation Specifications • SOIC−8 Package • This is a Pb−Free Device Typical Applications • Power Supplies for PC Silver Boxes, Games Adapter... • Flyback and Forward Converter
