NCP1253 Datasheet (ON Semiconductor) - Current-Mode PWM Controller

NCP1253, Current-Mode PWM Controller

Pin No.

Pin Name 1 GND 2 FB Function * Feedback pin 3 NC Non *connected pin 4 CS Current sense + ramp compensation 5 VCC Supplies the controller * protects the IC 6 DRV Driver output Description The controller ground.

Hooking an optocoupler collector to this

DATA SHEET www.onsemi.com Current-Mode PWM Controller for Off-line Power Supplies NCP1253 The NCP1253 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a tiny TSOP 6 package.

With a supply range up to 28 V, the controller hosts a jittered 65 kHz or 100 kHz switching circuitry operated in peak current mode control.

When the power on the secondary side starts to decrease, the controller automatically folds back its switching

NCP1253 Features

* Fixed

* Frequency 65 kHz or 100 kHz Current

* Mode Control Operation

* Frequency Foldback Down to 26 kHz and Skip

* Cycle in Light Load Conditions

* Adjustable Ramp Compensation

* Internally Fixed 4 ms soft

* start

* Timer

* based Auto

* Reco