### Overview: TDK-Lambda GWS250-48/CO2 The **GWS250-48/CO2** is a professional-grade AC-DC industrial power supply manufactured by TDK-Lambda. It is part of the GWS series, known for high efficiency and a compact 1U profile. The "/CO2" suffix specifically refers to a **conformal coating** applied to the internal Printed Circuit Board (PCB) for environmental protection. --- ### Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Output Voltage** | 48V DC | | **Output Power** | 250 Watts | | **Input Voltage Range** | 85 - 264V AC (Universal Input) | | **Output Current** | 5.2 A | | **Efficiency** | Up to 93% (High efficiency reduces heat waste) | | **Cooling** | Internal Fan Cooling | | **Form Factor** | Enclosed (1U Height compatible) | | **Protection** | Overvoltage, Overcurrent, Over-temperature | --- ### Core Electronic Components and Design #### 1. Power Factor Correction (PFC) The unit features **Active PFC**. This electronic sub-circuit ensures that the power supply draws current in phase with the line voltage, meeting EN61000-3-2 standards. This reduces harmonic distortion and improves efficiency for industrial grids. #### 2. The "/CO2" Designation: Conformal Coating The primary difference in this model is the chemical coating applied to the electronic parts. * **Material:** Usually a thin polymeric film. * **Purpose:** Protects components from moisture, dust, and chemical contaminants. * **Application:** Ideal for harsh environments where condensation or airborne pollutants might cause short circuits or corrosion on exposed solder joints. #### 3. Output Adjustment and Monitoring * **Potentiometer:** Includes a built-in trimmer to adjust the 48V output (typically ±10%). * **Remote On/Off:** Electronic circuitry allows the unit to be toggled without breaking the main AC line. * **DC Good Signal:** An internal monitoring circuit that provides a signal to a controller if the output voltage drops below a certain threshold. #### 4. Standby Power The unit includes a **5V / 0.3A Standby Supply**. This is an auxiliary power circuit that stays active even when the main 48V output is turned off, allowing it to power logic circuits or cooling fans. --- ### Connectivity Pinout (Typical) ```text L - AC Line Input N - AC Neutral Input FG - Frame Ground (Earth) -V - Negative DC Output +V - Positive DC Output CNT - Remote On/Off Control ``` ---