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
●• Maximum 65% Duty Cycle: C Version
●• Ready for Updated No Load Regulation Specifications
●• SOIC−8 and PDIP−8 Packages
●• These are Pb−Free Devices
●Typical Applications
●• Power Supplies for PC Silver Boxes, Games Adapter...
●• Flyback and Forward Converter
