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2022-09-24 23:33:15
CS2844 - Current Mode PWM Control Circuit, with 50% Maximum Duty Cycle
The CS3844/45 provide all the necessary functions to implement off-line fixed frequency current mode control with a minimum number of external components. The CS3844 series incorporates a new precise temperature controlled oscillator to minimize frequency variation. Internal toggle flip-flop, blank output every clock cycle, duty cycle range limited below 50%. Undervoltage lockout ensures that VREF is enabled before the output stage is stable. On the CS2844/CS3844 it appears again at 16V and off at 10V. The CS2845/CS3845 is again at 8.4V off at 7.6V. Other features include low start-up current, pulsed, pulsed current limit, and high current totem pole outputs to drive capacitive loads such as the gate of a power MOSFET. The output is low in shutdown, consistent with N-channel devices.