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S36012 Power Supply Circuit Diagram Guide

The switched high-voltage pulses are fed into the primary winding of a high-frequency ferrite-core transformer. This transformer serves two critical functions:

| | Typical Part Number | Function | | :--- | :--- | :--- | | PWM Controller IC | UC3842, TL494, KA7500 | Generates switching signal for MOSFET. | | Primary MOSFET | 20N60, IRF840, etc. | High-voltage power switch. | | Primary Capacitor | 400V, 100-220µF | Smooths rectified input voltage. | | Transformer | Custom Ferrite Core | Steps down voltage, provides isolation. | | Output Diodes | MBR2045CT (Schottky) | Rectifies high-frequency AC to DC. | | Output Capacitors | 25V, 2200µF | Filters output DC voltage. | | Voltage Reference | TL431 | Provides precise voltage reference for feedback. | | Optocoupler | PC817 | Transfers feedback signal across isolation barrier. |

Once the primary circuit swings into action, a small auxiliary winding built into the main high-frequency transformer generates a self-sustaining low-voltage supply line to efficiently power the controller continuously. 4. Half-Bridge Switching Network s36012 power supply circuit diagram

Understanding the is essential for technicians, engineers, and hobbyists looking to repair, reverse-engineer, or troubleshoot these units. This article breaks down the architecture of this popular, often generic, 360W power supply. 1. Overview of the S-360-12 SMPS Design

Once stable, control of the power transistors is assumed by the ubiquitous (or its equivalent, the KA7500). The switched high-voltage pulses are fed into the

: A Negative Temperature Coefficient (NTC) thermistor sits in series with the line to suppress heavy current spikes when the bulk capacitors charge during initial startup.

12V DC (manually adjustable from 10.8V to 13.2V via an onboard trimmer potentiometer) | High-voltage power switch

Instead of stepping down voltage using massive, heavy, traditional iron transformers, the S-360-12 slices the high-voltage DC into microscopic pieces at ultra-fast speeds.

: The AC input (110V/220V selectable) passes through an EMI filter and a bridge rectifier to charge two large high-voltage electrolytic capacitors (typically 470µF to 680µF, 200V–250V). Self-Oscillating Starting Circuit

: Mitigates electronic noise and improves signal precision for connected devices. Foldback Current Limiting

Check the output Schottky diodes and the output capacitors (C-E-R syndrome - Capacitors, Electrolytic, Rectifiers).


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