NCP1252ADR2G 开关控制器 ON

NCP1252ADR2G

开关控制器 CURR MDE PWM CNTRLR FWD FLYBCK APPS

Current Mode PWM  Controller for Forward and  Flyback Applications

The NCP1252ADR2G 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.

NCP1252ADR2G 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

• 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

NCP1252ADR2G Typical Applications

• Power Supplies for PC Silver Boxes, Games Adapter...

• Flyback and Forward Converter