![]() Note: Complete Technical Details can be found at the UC3842 datasheet given at the end of this page.Īlternatives PWM controller IC: UC2842, UC3844, SG2524 Optimized for Off-line and DC-to-DC Converters.Reference voltage based on which the PWM signal is produced. This pin outputs the PWM signal based on the feedback provided and we can use this to switch the power electronic device. The IC has an internal oscillator which can be set using an external resistor and capacitor connected to this pin. R T/C T (Timing Resistor/ Timing Capacitor) The difference in voltage level is supplied to this pinĪ shunt resistor is used to monitor the current through the circuit, and the voltage across it is provided as a feedback to the current sense pin It is an input to the error amplifier inside the IC. It is normally connected to the voltage feedback pin of the IC through a resistor and capacitor. It is an output pin that outputs low impedance 1MHz signal, based on the difference between the set and current-voltage. This article covers only the 8-Pin version of the IC. Note: UC3842 IC also comes in 14-Pin, 16-Pin, and 20-Pin packages. This IC is specially designed for Off-Line and DC to DC converter applications with minimum external components. The UC3842 is a fixed frequency current-mode PWM controller.
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