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 50A startup current, over and

undervoltage protection, and bidirectional synchronization. The

NCP1294 is available in a 16 lead SOIC narrow surface mount package.

特性 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