MPM3684GRU-Z

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The MPM3684GRU-Z is a DC to DC converters, designed to provide a well regulated DC output voltage from an isolated unregulated DC input power source. It is intended to meet the performance and cost requirements of low-power distributed power systems, where its key characteristics provide a solution to AC power-line frequency ripple, transient overvoltages, and non-customer grade power.

Features

The MPM3684GRU-Z features a high-efficiency, positive voltage and current transfer characteristic over an extended temperature range. It has a low quiescent current draw of 100 mA (maximum) during normal operating conditions. It is compatible with standard and low-power logic families without a need for additional replays or external components. It provides an adjustable output voltage that is continuously adjustable from 3.3 to 24 V. The device also features a temperature-compensated overvoltage protection which ensures the output voltage is within 5% of its rated value over its operating temperature range (−25°C to +85°C).

Applications

The MPM3684GRU-Z is suitable for a wide range of applications such as embedded systems, communications, datacom, ups, and telecommunication equipment, power supplies, laptop computers, industrial automation and control, medical equipment, retail/point of sale terminals, and networking.

Working Principle

The MPM3684GRU-Z DC to DC converter works on the principle of transformerless step-down converter (TDC). The TDC uses two high-speed switches (Q1 and Q2) operated at a frequency of around 400kHz. The input voltage is rectified by diode D1 and the current through the switches is limited by R1. The output voltage is regulated by the integrated regulation loop, which compares the output voltage to the reference voltage. If the output voltage is higher than the reference voltage, the control loop deactivates switches Q1 and Q2, thus reducing the output voltage. If the output voltage is lower than the reference voltage, the control loop activates Q1 and Q2, thereby increasing the output voltage. The control loop is activated by an oscillator operating at 400kHz, and the output voltage is further regulated with the help of the secondary winding signal of the transformer (L1).

Advantages

The MPM3684GRU-Z DC to DC converter offers many advantages over traditional converter technologies such as full-wave center-tapped or bridge rectification, cost savings due to the transformerless operation, high efficiency and power density due to low-power active components, wide input voltage range, and overvoltage protection. The device also offers protection functions such as thermal shutdown, short-circuit protection, and an input current limit.

Conclusion

The MPM3684GRU-Z is a reliable, high-performance DC to DC converter with adjustable output voltage and many advantages. It is suitable for a wide range of applications and can be used to provide a well regulated DC output voltage from an isolated unregulated DC input power source. This makes the device ideal for low-power distributed power systems, where its key characteristics provide a solution to AC power-line frequency ripple, transient overvoltages, and non-customer grade power.

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