Introduction and Applications of Electronic Component LPQ252-CEF

Creation Date

In the field of power electronics, reliable and efficient power supply modules are the cornerstone of stable operation for various electronic devices. The LPQ252-CEF, a quad-output AC-to-DC power supply module developed by Artesyn Embedded Technologies (a brand under Emerson), has won wide recognition in industrial and communication fields due to its excellent performance, multiple protection mechanisms and flexible application capabilities. This article will elaborate on the core specifications, key features and typical application scenarios of the LPQ252-CEF, aiming to provide a comprehensive reference for relevant practitioners and researchers.

1. Core Specifications of LPQ252-CEF

As a regulated enclosed AC-to-DC converter, the LPQ252-CEF has a complete set of technical parameters that adapt to diverse working environments and load requirements. Its core specifications are as follows:

  • Input Parameters: It supports a wide input voltage range, including 85-264V AC and 120-300V DC, and is compatible with an input frequency of 47-440Hz. This wide input range enables the module to work stably in different regional power grids and complex power environments. The maximum inrush current is 20A under cold start conditions at 25°C, which helps reduce the impact on the power grid during startup.
  • Output Parameters: The module features four output channels, providing flexible voltage and current combinations to meet the power needs of multi-component devices. Specifically, the output voltages are 5V, 12V, -12V, and an adjustable floating 4th output (ranging from ±5V to 25V). The corresponding output currents are 35A, 10A, 6A, and 6A respectively, with a total output power of 250W. In addition, it is equipped with two supervisory outputs (5V @ 100mA and 12V @ 500mA) to further enhance the stability of the power supply system.
  • Physical and Environmental Parameters: The LPQ252-CEF adopts an enclosed package with dimensions of 127mm (width) × 228.6mm (length) × 80.6mm (maximum height) and a weight of 1410g. It is designed for chassis mounting and is equipped with an end fan cover (the “CEF” suffix indicates this configuration) to ensure effective heat dissipation. The operating temperature range is 0°C to 50°C, which is suitable for most industrial working environments. The module also has a typical efficiency of 75% at full load, helping to reduce energy consumption and heat generation.
  • Safety and Compliance: It complies with multiple international safety standards, including UL 1950, CSA 22.2-234 Level 5, and EN 60950. In terms of electromagnetic compatibility (EMC), it meets FCC Class B and CISPR 22 Class B standards for conducted and radiated emissions, minimizing interference to other electronic devices. It should be noted that the module is not compliant with EU RoHS and is classified as ECCN EAR99 in the United States.
  • Comprehensive Protection Mechanisms: The module is equipped with a full range of protection functions, including overvoltage protection, overload protection, short-circuit protection and thermal overload protection. For example, the overvoltage protection threshold for the 5V output is 5.7-6.7V DC, and the overvoltage protection thresholds for other outputs are 10%-25% above the nominal voltage. These protection mechanisms can quickly respond to abnormal working conditions, effectively protecting the module itself and the connected load devices from damage.
  • Advanced Power Management Functions: It has active power factor correction (PFC) function, which can improve the power factor of the input current, reduce harmonic pollution to the power grid, and meet the requirements of IEC EN 61000-3-2 standard. In addition, it supports remote sense on the main output, which can compensate for the voltage drop caused by the transmission line, ensuring the accuracy of the output voltage at the load end. It also has power fail and remote inhibit functions, facilitating the remote monitoring and control of the power supply system.
  • Flexible and Convenient Design: The 4th output channel of the module is floating and adjustable, allowing users to set the output voltage within the range of ±5V to 25V according to actual needs, which greatly improves the flexibility of application. At the same time, it supports single-wire current sharing, enabling multiple modules to work in parallel to provide larger output current, meeting the power supply needs of high-power devices. The built-in EMI filter further reduces electromagnetic interference, ensuring the stable operation of the module in complex electronic environments.
  • Industrial Control Field: It is an ideal power supply solution for industrial automation equipment, production line control systems, programmable logic controllers (PLC) and other devices. In industrial control environments, devices often require multiple voltage levels to power different components (such as microprocessors, sensors, and actuators). The quad-output design of the LPQ252-CEF can meet these diverse power needs at one time. Its wide operating temperature range and strong anti-interference ability ensure stable operation even in harsh industrial environments with large temperature fluctuations and strong electromagnetic interference.
  • Communication Equipment Field: It is widely used in power supply systems of communication base stations, switches, routers and other communication equipment. Communication equipment has high requirements for the stability and reliability of power supply, as power supply interruptions or voltage fluctuations may lead to communication failures. The LPQ252-CEF’s wide input voltage range can adapt to the unstable power supply environment of communication base stations in remote areas, and its comprehensive protection functions and high efficiency can ensure the continuous and stable operation of communication equipment, improving the quality and reliability of communication services.
  • Medical Instrument Field: It can meet the power supply needs of some medical instruments that have high requirements for power supply stability and reliability. For example, some diagnostic equipment (such as ultrasonic diagnostic instruments) and monitoring equipment (such as patient monitors) require stable power supply to ensure the accuracy of test results and the safety of patients. The LPQ252-CEF’s precise output voltage control, low ripple and noise (maximum ripple and noise are 50mV, 120mV and 240mV for different channels) and comprehensive protection mechanisms can meet the strict power supply requirements of these medical instruments.
  • Other Fields: In addition to the above fields, the LPQ252-CEF is also applied in security monitoring systems, data centers and test measurement equipment. In security monitoring systems, it provides stable power for cameras, video recorders and other equipment to ensure 24-hour continuous monitoring. In data centers, it can be used as a power supply module for server accessories, improving the stability of the data center’s power supply system. In test measurement equipment, its precise output voltage and low ripple characteristics help improve the accuracy of test results.