CS51023

CS51021/22/23/24 CS51021/CS51023 CS51022/CS51024 Enhanced Current Mode PWM Controller Description The CS51021/22/23/24 Fixed Frequency PWM Current Mode Controller family provides all necessary features required for AC-DC or DC-DC primary side control. Several features are included eliminating the additional components needed to implement them externally. In addition to low start-up current (75µA) and high frequency operation capability, the CS51021/ 22/23/24 family includes overvoltage and undervoltage monitoring, externally programmable dual Device Features s 75µA Max. Startup Current s Fixed Frequency Current Mode Control s 1MHz Switching Frequency s Undervoltage Protection Monitor s Overvoltage Protection Monitor with Programmable Hysteresis s Programmable Dual Threshold Overcurrent Protection with Delayed Restart s Programmable Soft Start s Accurate Maximum Duty Cycle Limit s Programmable Slope Compensation s Leading Edge Current Sense Blanking s 1A Sink/Source Gate Drive s Bidirectional Synchronization (CS51021/23) s 50ns PWM Propagation Delay s 100µA Max Sleep Current (CS51022/24) threshold overcurrent protection, current sense leading edge blanking, current slope compensation, accurate duty cycle control and an externally available 5V reference. The CS51021 and CS51023 feature bidirectional synchronization capability, while the CS51022 and CS51024 offer a sleep mode with 100µA maximum IC current consumption. The CS51021/22/23/24 family is available in a 16 lead nar...