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Enhanced Voltage Mode PWM Controller
ON Semiconductor Corp
Description
The CS51221 fixed frequency feed forward voltage mode PWM controller contains all of the features necessary for basic voltage mode operation. 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 50uA startup current, over and under voltage protection, and bidirectional synchronization. The CS51221 is available in a SOIC-16 and TSSOP-16 surface mount packages.
Features
1MHz Frequency Capability Fixed Frequency Voltage Mode Operation, with Feed Forward Thermal Shutdown Under Voltage Lock-out Accurate Programmable Max Duty Cycle Limit 1A Sink/Source Gate Drive Programmable Pulse-by-Pulse Overcurrent Protection Leading Edge Current Sense Blanking 75ns Shutdown Propagation Delay Programmable Soft Start Undervoltage Protection Overvoltage Protection with Programmable Hysteresis Bi-directional Synchronization 25ns GATE Rise and Fall Time (1nF load) 3.3V 3% Reference Voltage Output Pb-Free Package is Available
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