The **LPQ142** belongs to the **LPQ140 series** manufactured by Artesyn Embedded Power (Advanced Energy). It is a highly versatile, high-performance AC-DC open-frame power supply commonly used in industrial, networking, and telecommunications equipment. --- ## 1. Technical Specifications The LPQ142 is characterized by its "Quad Output" capability, providing four distinct DC voltages from a single AC input. | Parameter | Specification | | :--- | :--- | | **Input Voltage** | 85 - 264 VAC (Universal Input) | | **Total Power** | 110W (Convection), 145W (with 30CFM Airflow) | | **Output Channels** | 4 (Quad Output) | | **Safety Certifications** | UL, CSA, VDE, CE Mark | | **Form Factor** | Open Frame (approx. 4.25" x 7" x 1.5") | | **Efficiency** | 70% typical at full load | --- ## 2. Output Rail Configuration The "142" model is specifically defined by its voltage distribution across the four output terminals: | Output | Voltage (V) | Min Current | Max (Convection) | Max (Forced Air) | | :--- | :--- | :--- | :--- | :--- | | **V1** | +5V | 2.0A | 12A | 15A | | **V2** | +12V | 0.5A | 5A | 6A | | **V3** | -12V | 0A | 1A | 1.5A | | **V4** | ±5V-25V (Adj) | 0.5A | 1.5A | 2A | --- ## 3. Key Electronic Features ### A. Power Factor Correction (PFC) Unlike basic power supplies, the LPQ142 includes active power factor correction. This reduces harmonic distortion and ensures compliance with international standards like IEC61000-3-2. ### B. Protection Circuits The unit is engineered with several protective layers to prevent damage to the connected electronics: * **Overvoltage Protection (OVP):** Built-in on the +5V output (V1). * **Overload Protection:** All outputs are protected against short-circuit conditions with "foldback" current limiting. * **Thermal Protection:** Internal sensing shuts down the unit if temperatures exceed safe operating limits. ### C. Remote Sensing and Signals * **Remote Sense:** Available for the V1 (+5V) output to compensate for voltage drops across long lead wires. * **Power Fail Signal:** Provides a TTL-compatible signal that drops low at least 6ms before the output voltage falls below regulation, allowing for safe system shutdowns. --- ## 4. Connector Pinout (J1 & J2) The board uses standard Molex headers for connections. ```text J1 (Input): - Pin 1: Neutral - Pin 3: Line - Pin 5: Ground J2 (Output): - Pins 1, 2, 3: +5V (V1) - Pins 4, 5, 6: Common (Return) - Pins 7, 8: +12V (V2) - Pin 9: -12V (V3) - Pin 10: V4 (Adjustable) ``` ---