| Parameter | Value | | :--- | :--- | | | S-360-12 | | DC Output Voltage | 12V | | Rated Output Current | 30A | | Output Power | 360W | | Output Voltage Adjustable Range | 10V ~ 13.2V (±15%) | | AC Input Voltage Range | 90~132VAC / 180~264VAC (Selectable) | | Input Frequency | 47~63Hz | | Input AC Current | 6.5A / 115V ; 4A / 230V | | Inrush Current | Cold start: 50A / 115V, 50A / 230V | | Efficiency | >74% (Typical) | | Ripple & Noise | 150mVp-p (Max) | | Protections | Short circuit / Overload / Over voltage | | Voltage Tolerance | ±1% | | Dimensions (L W H) | 215 115 50mm | | Weight | 1 kg (2.2 lbs) |
The S36012 is a switch-mode DC-DC regulator (step-down) commonly used to power small electronics from higher-voltage sources. This post explains typical applications, required components, and a clear reference circuit diagram you can adapt for 5 V or 3.3 V outputs.
[AC Input] ➔ [EMI Filter & Rectifier] ➔ [Switching & Transformer] ➔ [Output Rectification] ➔ [DC Output] ▲ │ └───────── [Feedback Loop] ◄────────┘ s36012 power supply circuit diagram
| Symptom | Likely Culprits (Based on Circuit Diagram) | | :--- | :--- | | No output, no fan | Blown primary-side fuse, faulty power switch, disconnected AC input wiring. | | No output, fan running but no LED | Failure in the primary startup circuit, faulty PWM controller IC, defective switching MOSFET, shorted components on secondary side. | | Output voltage is low or unstable | Aging or dried-out output filter capacitors, faulty feedback circuit (TL431/opto-coupler), worn-out Schottky rectifier diodes. | | Output is present but trips under load | Failed output capacitors causing high ripple, overload condition from a shorted load (e.g., faulty LED strip). | | Excessive AC ripple on output | Dried-out or failing output filter capacitors. | | Power supply whines or chirps | Could be due to heavy overload, a failing component in the feedback loop, or the controller repeatedly attempting to start. |
The main transformer lowers the high-frequency pulsed voltage to a lower AC voltage. Schottky diodes are used in the output stage to rectify this AC into 12V DC. The output stage typically features substantial filtering capacitors and a large output inductor to ensure a stable 30A current. E. PWM Controller (TL494) | Parameter | Value | | :--- |
Once you master the , you can modify it:
Have you repaired or modified an S36012? Share your experiences and annotated circuit diagrams in the comments below. For more power supply schematics, check out our guides on the XL4016 and DPS5020. | | No output, fan running but no
Large (typically two 470µF or 680µF units) smooth the DC voltage. Switching Stage (Inverter):
Position: The circuit acts as a voltage doubler using the same two capacitors, allowing the rectifier to achieve the necessary high-voltage DC for the switching transistors.
: A high-frequency transformer steps down the high-voltage DC pulses to the required lower voltage level. Output Filtering