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S36012 Power Supply Circuit Diagram «720p 2025»

| Protection | Circuit Method | Action | | :--- | :--- | :--- | | | Current sensing via a 0.01Ω/5W wirewound resistor on the negative output rail. Voltage across it is fed to pin 16 (Error Amp 2) of TL494. | If voltage exceeds ~0.3V (≈30A), TL494 shuts down output. Hiccup mode. | | Over-voltage (OVP) | A Zener diode (13V) + SCR (C106) across output. | If output >13.5V, Zener triggers SCR, shorting output and blowing the primary fuse. | | Over-temperature | NTC thermistor bonded to the main heatsink, connected to TL494 shutdown pin. | Shuts down at >85°C. Automatically resumes when cool. |

Chops the DC voltage into high-frequency pulses using power transistors.

| | Possible Cause | Action Using the Schematic | | :--- | :--- | :--- | | No Output, No LED | AC power lost; Fuse blown; Input components failed. | Check voltage at "L" and "N" terminals. Visually inspect the fuse on the PCB. Check continuity of the bridge rectifier and primary capacitor. | | No Output, LED On | Start-up resistor open; PWM IC failed; MOSFET shorted. | Locate the high-value (e.g., 150k) start-up resistors feeding the PWM IC's VCC pin (e.g., pin 7 on UC3842). Measure voltage there. | | Output is Zero/Unstable | Faulty connection; Shorted output diode; Blown fuse in secondary. | Disconnect load and measure output voltage. If voltage returns, the issue is the load or wiring. If not, use the schematic to trace the secondary circuit, checking output diodes and capacitors. | | Output Voltage Low | High load; Output capacitor(s) failing; Feedback loop issue. | Measure voltage at "+V" terminal under load. Use the schematic to inspect feedback components like the TL431 and optocoupler, and check the output filter capacitors for swelling. | | Power Supply Shuts Down under Load | Overload protection triggered; Insufficient cooling. | Reduce load and retest. Check fan operation. Inspect the current-sense resistor on the primary side using the schematic. Check for overheating components. | | Excessive Ripple or Noise | Output filter capacitors dried out; Poor grounding. | Use an oscilloscope to check the output waveform. Replace the main output filter capacitors. Check the PCB ground layout. | | High-Frequency Whining/Buzzing | Loose transformer core; Failing switching capacitor. | Tighten or glue the transformer core. Inspect the snubber network components and the PWM controller's timing capacitor. | | Fan Not Working/Erratic | Faulty thermistor; Fan seized; Control transistor failed. | Locate the fan drive circuit on the schematic. Check the thermistor (RT3) and associated transistors. Power the fan directly to test it. | s36012 power supply circuit diagram

The heart of the S36012 control system is typically an analog PWM controller IC, such as the classic or KA7500 .

FUNCTION Maintain_Output_Voltage: READ V_sense from Output_Rail | Protection | Circuit Method | Action |

Before drawing the circuit, the following parameters define the constraints of the schematic:

AC Input (L,N) --> EMI Filter --> Bridge Rectifier --> Bulk Capacitors --> MOSFETs | [PWM IC KA7500C] | Main Transformer --> Schottky Diodes --> LC Filter --> DC Output (+12V) | | Aux Winding --> Vcc for PWM IC | Feedback Divider | Optocoupler <-- TL431 Hiccup mode

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