The **PSAC24E-120P-R** is a high-efficiency AC/DC wall adapter manufactured by **Phihong USA**. It is commonly used as a power supply for networking equipment, consumer electronics, and peripherals. --- ### 1. Key Technical Specifications Below is a breakdown of the electrical characteristics of this specific model: | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 12V DC | | **Output Current** | 2.0A | | **Total Power** | 24W | | **Input Voltage Range** | 90V to 264V AC (Universal) | | **Efficiency** | Level VI (High Efficiency Standard) | | **Output Connector** | 2.1mm x 5.5mm x 9.5mm (Center Positive) | | **AC Plug Type** | Type C (European/Europlug - 2 Pin) | --- ### 2. Internal Electronic Design The device utilizes a **Switch-Mode Power Supply (SMPS)** topology. The internal electronic components work together to convert high-voltage AC into stable low-voltage DC: * **Input Protection:** Includes a fuse and a thermistor to protect against overcurrent and inrush current surges. * **Rectification & Filtering:** High-voltage diodes and capacitors convert the AC input into a high-voltage DC bus. * **PWM Controller:** A Pulse Width Modulation (PWM) IC regulates the switching frequency to ensure precise output voltage regardless of load changes. * **Isolation Transformer:** Provides galvanic isolation between the dangerous AC mains and the user-accessible DC output. * **Feedback Loop:** Uses an opto-isolator to monitor the output voltage and send signals back to the primary side for real-time adjustments. --- ### 3. Safety and Compliance Features The "R" in the part number often signifies RoHS compliance. The unit includes several built-in electronic protection circuits: 1. **Over-Voltage Protection (OVP):** Shuts down the unit if the output voltage exceeds safe limits. 2. **Short Circuit Protection (SCP):** Prevents damage to the internal circuitry if the DC wires are crossed. 3. **Over-Current Protection (OCP):** Limits the output current to prevent overheating. 4. **No-Load Power Consumption:** Designed to consume less than 0.1W when plugged in but not connected to a device. --- ### 4. Part Number Decoding The model name follows Phihong's standard nomenclature: * **PSAC:** Series name (Adapter style). * **24E:** 24 Watts power rating with an "E" (European) plug configuration. * **120:** Represents the 12.0V output. * **P:** DC Plug type (typically the standard barrel jack). * **R:** RoHS compliant.