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.

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