Chip-cn-dat/dongke-dat/2026-05-15-15-19-55.png
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Chip-cn-dat/dongke-dat/dongke-dat.md
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+# dongke-dat
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+
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+- [[dongke-dat]] - [[DK112-dat]] - [[ACDC-dat]]
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+DK112 芯片是专用小功率开关电源控制芯片，广泛用于电源适配器、LED电源、电磁炉、 空调、DVD等小家电产品。
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+![](2026-05-15-15-19-55.png)
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+
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+
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+## ref
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+
Chip-dat/AIT-IC-dat/AIT-IC-dat.md
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+
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+
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+# AIT-IC-dat.md
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+
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+- [[AP8022-dat]] - [[AIT-IC-dat]] - [[ACDC-dat]]
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+
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+
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+## ref
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\ No newline at end of file
Chip-dat/FairChild-dat/FairChild-dat.md
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+UC3842/UC3843/UC3844/UC3845 - [[fairchild-dat]] - [[SMPS-dat]]
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+
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+The UC3842/UC3843/UC3844/UC3845 are fixed frequencycurrent-mode PWM controller. They are specially designed for Off-Line and DC to DC converter applications with minimum external components.
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+
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+
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## ref
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power-dat/ACDC-dat/ACDC-dat.md
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# ACDC-dat
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-== SMPS
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+- [[SMPS-dat]] - [[power-dat]] - [[ACDC-dat]] - [[DCDC-dat]]
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-- [[ac-mains-dat]] - [[ACDC-dat]]
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+- [[ac-mains-dat]] - [[ACDC-dat]] - [[power-dat]]
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[legacy wiki page](https://www.electrodragon.com/w/AC-DC)
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- [[ST-ACDC-dat]] - [[ACDC-dat]] - [[VIPER22-dat]]
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-- [[power-integrations-dat]] - [[LNK302-dat]] - [[TNY267-dat]] - [[ACDC-dat]] - [[ac-mains-dat]]
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+- [[power-integrations-dat]] - [[LNK302-dat]] - [[TNY267-dat]] - [[ACDC-dat]] - [[ac-mains-dat]]
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+
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+- [[dongke-dat]] - [[DK112-dat]] - [[ACDC-dat]]
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+
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+
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power-dat/DCDC-dat/dcdc-dat.md
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# dcdc-dat
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+- [[SMPS-dat]] - [[power-dat]] - [[ACDC-dat]] - [[DCDC-dat]]
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- [[dcdc-down-dat]] - [[dcdc-boost-dat]]
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power-dat/SMPS-dat/SMPS-dat.md
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+
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+# SMPS-dat
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+
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+- [[SMPS-dat]] - [[power-dat]] - [[ACDC-dat]] - [[DCDC-dat]]
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+
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+An SMPS (Switched-Mode Power Supply) is an electronic circuit that efficiently converts electrical power from one form to another, typically changing AC (wall voltage) to regulated DC.
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+UC3842/UC3843/UC3844/UC3845 - [[fairchild-dat]] - [[SMPS-dat]]
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+Unlike traditional, bulky transformers, it uses high-speed switching components to provide lightweight, highly efficient, and cool-running power.
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+
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+## SMPS vs. DC-DC Converters (Step-Down/Boost)
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+At a fundamental level, **a DC-DC step-down (buck) or boost module *is* a type of SMPS (Switched-Mode Power Supply).** However, in practical electronics, the term "SMPS" usually refers to a complete AC-to-DC unit, while "DC-DC Modules" refer to small boards used for fine-tuning voltage within a circuit.
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+
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+---
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+
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+### 1. The Core Definitions
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+
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+* **SMPS (Switched-Mode Power Supply):** An overarching category of power supply technology that uses a switching regulator to convert power. It is the efficient alternative to a linear regulator (which wastes excess voltage as heat).
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+* **DC-DC Converter Module:** A specific sub-type of SMPS. It takes an existing DC voltage and changes it to a higher (**Boost**) or lower (**Buck**) DC voltage using an inductor.
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+
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+
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+
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+---
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+
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+### 2. Key Differences in Practical Use
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+
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+#### Input Voltage
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+* **SMPS (Mains Unit):** Usually converts **AC to DC**. It plugs into the wall (110V/220V AC) and outputs a stable DC voltage (like 12V or 24V).
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+* **DC-DC Module:** Operates strictly **DC to DC**. It cannot plug into a wall. It takes a DC source (like a battery) and adjusts it (e.g., stepping 12V down to 5V for a USB port).
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+
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+#### Isolation and Safety
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+* **SMPS:** Almost always **Isolated**. Because it handles high-voltage mains, it uses a transformer to ensure there is no physical electrical connection between the "Hot" AC side and the "Cold" DC output side.
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+* **DC-DC Modules:** Usually **Non-Isolated**. They typically share a common ground (GND) between the input and the output.
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+
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+
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+
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+#### Energy Storage Components
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+* **AC-DC SMPS:** Primarily uses a **High-Frequency Transformer** to change voltage levels and provide isolation.
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+* **DC-DC Module:** Primarily uses an **Inductor** (a wire coil) to store energy in a magnetic field and release it to the output at a different voltage.
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+
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+---
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+
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+### 3. Comparison Table
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+
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+| Feature | Typical AC-DC SMPS Unit | DC-DC Buck/Boost Module |
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+| :--- | :--- | :--- |
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+| **Input Power** | High-voltage AC (Mains 110V/220V) | Low-voltage DC (Batteries, USB) |
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+| **Output Power** | Regulated DC | Regulated DC (Step up or Step down) |
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+| **Safety Isolation** | Yes (Transformer isolated) | Usually No (Common Ground) |
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+| **Key Component** | High-frequency Transformer | Inductor |
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+| **Typical Form Factor** | Metal "mesh" box or laptop brick | Small PCB with a blue potentiometer |
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+
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+---
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+
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+### 4. How They Work Together
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+
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+In a typical project (like a 3D printer or a PC), you use both:
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+1. The **AC-DC SMPS** takes power from the wall and provides a main "bus" of 24V DC.
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+2. Small **DC-DC Step-Down Modules** take that 24V and drop it to 5V for the controller board and 3.3V for the sensors.
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+
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+
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+## ref
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+
power-dat/power-dat.md
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- [[power-energy-harvest-dat]]
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+- [[SMPS-dat]] - [[power-dat]] - [[ACDC-dat]] - [[DCDC-dat]]
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## Info
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