Optocoupler Resistor Selection in SMPS Feedback

In this video, I explain PC817 Optocoupler Resistor Calculation step by step using the datasheet values. ✅ PC817 Datasheet Parameters ✅ Forward Voltage (VF) Calculation ✅ LED Current Selection ✅ Current Limiting Resistor Formula ✅ 12V to PC817 Resistor Calculation ✅ Resistor Power Rating Calculation ✅ Practical SMPS Feedback Circuit Example Formula Used: R = (Vin - VF) / IF Example: Vin = 12V VF = 1.2V IF = 20mA R = (12 - 1.2) / 0.02 = 540Ω Nearest Standard Value = 560Ω Watch the complete video to understand how to select the correct resistor value for PC817 in SMPS feedback circuits. #PC817 #Optocoupler #SMPS #Electronics #ResistorCalculation #TL431 #UC3842 #PowerSupply #FlybackSMPS#ElectronicsEngineering #PWM #FeedbackCircuit #DatasheetExplained