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CS2844, CS3844, CS2845, CS3845
Current Mode PWM Control Circuit with 50% Max Duty Cycle
The CS3844/45 provides all the necessary features to implement off–line fixed frequency current–mode control with a minimum number of external components.
The CS3844 family incorporates a new precision temperature–controlled oscillator to minimize variations in frequency. An internal toggle flip–flop, which blanks the output every other clock cycle, limits the duty–cycle range to less than 50%. An undervoltage lockout ensures that VREF is stabilized before the output stage is enabled. In the CS2844/CS3844 turn on occurs at 16 V and turn off at 10 V. In the CS2845/CS3845 turn on is at 8.4 V and turn off at 7.6 V.
CS2845 Datasheet
