NCP1294

Flyback, Boost, Forward PWM Controller NCP1294 The NCP1294 fixed frequency feed forward voltage mode PWM controller contains all of the features necessary to be configured in a Flyback, Boost or Forward topology. This PWM controller has been optimized for high frequency primary side control operation. In addition, this device includes such features as: Soft−Start, accurate duty cycle limit control, less than 50mA startup current, over and undervoltage protection, and bidirectional synchronization. The NCP1294 is available in a 16 lead SOIC narrow surface mount package. Features 1.0 MHz Frequency Capability Fixed Frequency Voltage Mode Operation, with Feed Forward Thermal Shutdown Undervoltage Lock−Out Accurate Programmable Max Duty Cycle Limit 1.0 A Sink/Source Gate Drive Programmable Pulse−By−Pulse Overcurrent Protection Leading Edge Current Sense Blanking 75 ns Shutdown Propagation Delay Programmable Soft−Start Undervoltage Protection Overvoltage Protection with Programmable Hysteresis Bidirectional Synchronization 25 ns GATE Rise and Fall Time (1.0 nF Load) 3.3 V 3% Reference Voltage Output These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant DATA SHEET www.onsemi.com 16 1 16 1 SOIC−16 D SUFFIX CASE 751B TSSOP−16 DB SUFFIX CASE 948F PIN CONNECTIONS AND MARKING DIAGRAM 1 GATE ISENSE SYNC FF UV OV RTCT ISET NCP1294EG AWLYWW 16 VC PGND VCC VREF LGND SS COMP VFB 16 NCP 1294 ALYW 1 G NCP1294= Specific Device Code ...