Wx-dc12003 - Schematic
The MOSFET and the PWM Controller IC.
| Component | Value/Part | Role in Schematic | | :--- | :--- | :--- | | | 0.1Ω, 5W | Current sensing shunt & ballast | | Q1-Q4 | MJ15024 | Main pass transistors | | Q5 | TIP41C | Pre-driver for pass bank | | U2 | LM324 | Control loop & metering | | U3 | TL431 | 2.5V precision reference | | D9, D10 | 1N4007 | Protection diodes (output to input) | | RV1 | 10kΩ multi-turn | Output voltage trim (factory set) |
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The is a compact, isolated switched-mode power supply (SMPS) module designed to convert high-voltage AC or DC input into a stable 5V DC output. Widely used in IoT devices, smart home sensors, and industrial controls, its small footprint (approx. 23x18mm) and high efficiency (~80%) make it a popular choice for hobbyists and professionals alike. Technical Specifications
Multiple modules of the same voltage can be connected in parallel to increase total current capacity in tight spaces. wx-dc12003 schematic
The IC samples the voltage of an auxiliary winding on the flyback transformer during the off-time of the primary switch. Because the auxiliary winding voltage is proportional to the secondary output voltage, the controller can maintain stable regulation within ±plus or minus
Because of its small size and isolation, the WX-DC12003 is a favorite for smart home developers.
The is a highly compact, ultra-budget isolated switched-mode power supply (SMPS) module widely used by electronics hobbyists and hardware engineers to convert high-voltage mains electricity into a stable low-voltage DC output . Typically found on popular marketplaces like AliExpress and Alibaba , this sub-one-dollar board is favored for its tiny open-frame footprint (approximately 23x18x14mm) and built-in safety separation. Understanding the WX-DC12003 schematic and internal architecture is critical for safely integrating this module into commercial or custom printed circuit board (PCB) designs. Core Specifications Overview
: The heart of the circuit is a single-chip offline switcher (such as a TOP series or similar integrated PWM/MOSFET IC). This IC handles the high-frequency switching into the primary side of the isolation transformer. The MOSFET and the PWM Controller IC
: Users have noted its consistency over several years, though variations exist. For instance, a similar module marked JL-AD3W-HT-V3 exists but may require extra filtering compared to the WX-DC12003 Go to product viewer dialog for this item.
The WX-DC12003 is a high-performance DC power supply designed for various applications, including laboratory research, testing, and industrial production. It offers a wide range of output voltages and currents, making it a versatile tool for powering sensitive electronic equipment.
The best place to find this wx-dc12003 schematic is the "All About Circuits" forum. A direct link to the relevant discussion thread is https://forum.allaboutcircuits.com/threads/more-information-on-wx-dc12003-and-other-cheap-power-modules-from-aliexpress.192345/ . The community-created schematic is attached to a post within this thread.
Instead of using a traditional, space-consuming optocoupler (like an EL817) and an adjustable shunt regulator (like a TL431) for feedback, the WX-DC12003 utilizes . Learn more Can't delete the links right now
The primary side utilizes an offline converter integrated circuit (often matching the functional footprint of a TOP254YN or an equivalent low-power PSR controller). This chip houses a high-voltage power MOSFET alongside control logic, current-sensing circuitry, and thermal shutdown components.
). It generally features high-voltage electrolytic capacitors (typically 4.7µF/400V) for rectification and filtering. Output Stage:
The WX-DC12003 schematic diagram is a detailed representation of the power supply's internal circuitry. It shows the connections between components, such as resistors, capacitors, inductors, and semiconductors. The schematic diagram is typically divided into several sections, including:
0.15V without a physical feedback connection spanning the isolation barrier.