## Overview of the TDK-Lambda ZWS300BAF-24/CO2 The **ZWS300BAF-24/CO2** is a high-reliability, industrial-grade AC-DC single-output power supply manufactured by TDK-Lambda. It belongs to the ZWS-BAF series, designed for high efficiency and a compact footprint. The suffix **"/CO2"** specifically denotes that the printed circuit board (PCB) is **coated** on both sides for improved resistance to environmental contaminants and humidity. --- ### Key Technical Specifications | Parameter | Details | | :--- | :--- | | **Input Voltage Range** | 85 - 265 VAC (Universal Input) or 120 - 370 VDC | | **Output Voltage** | 24 VDC | | **Output Current** | 12.5 A | | **Maximum Power** | 300 W | | **Efficiency** | Typical 86% - 91% (depending on input voltage) | | **Cooling** | Convection Cooled (No fans required) | | **Safety Certifications** | UL60950-1, CSA C22.2 No.60950-1, EN60950-1, EN50178 | --- ### Core Electronic Components & Features #### 1. Power Factor Correction (PFC) This unit features **Active PFC** circuitry. This ensures compliance with EN61000-3-2 harmonics standards, reducing the reactive power load on the electrical grid and improving overall energy efficiency. #### 2. Conformal Coating (/CO2 Option) The electronic assembly is treated with a protective coating. * **Purpose:** Prevents short circuits caused by dust, moisture, or chemical pollutants. * **Benefit:** Extends the lifespan of the electrolytic capacitors and semiconductor junctions in harsh industrial environments. #### 3. Filtering and Protection Circuitry * **EMI Filter:** Integrated input filtering to minimize electromagnetic interference. * **Overcurrent Protection (OCP):** Constant current limiting with automatic recovery. * **Overvoltage Protection (OVP):** Shuts down the unit if the output exceeds approximately 115-135% of the nominal voltage. * **Thermal Protection:** Integrated sensors to prevent damage from overheating. #### 4. Output Adjustment The unit includes a **Potentiometer (V.ADJ)** located near the output terminals, allowing the user to fine-tune the 24V output (typically within a ±10% range) to compensate for voltage drops over long cable runs. --- ### Physical Interface | Component | Description | | :--- | :--- | | **Input Terminals** | L (Line), N (Neutral), FG (Frame Ground) | | **Output Terminals** | +V and -V Screw terminals | | **LED Indicator** | Green LED indicating "Output OK" | ---