NCP1252
NCP1252 is PWM Controller manufactured by onsemi.
Current Mode PWM Controller for Forward and Flyback Applications
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 SOIC- 8 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 k Hz
- Jittering Frequency 5% of the Switching Frequency
- Latched Primary Over Current Protection with 10 ms Fixed Delay
- Delay Extended to 150 ms in E Version
- Delayed Operation Upon Start- up via an Internal Fixed Timer
(A, B and C versions only)
- 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 pensation
- +500 m A /
- 800 m A Source / Sink Capability
- Maximum 50% Duty Cycle: A Version
- Maximum 80% Duty Cycle: B Version
- Maximum 65% Duty Cycle: C Version
- Maximum 47.5% Duty Cycle: D & E Versions
- 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
DATA SHEET .onsemi.
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