LM25037EVAL/NOPB

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Evaluation boards are a key component of any DC/DC or AC/DC (off-line) switching mode power supply (SMPS) designed to accelerate the design process, improve the accuracy of the design, and represent the performance of the power supply. This article will provide an introduction to the application field and working principle of the LM25037EVAL/NOPB evaluation board.

Application Field of the LM25037EVAL/NOPB

The LM25037EVAL/NOPB is an evaluation board designed for use with the LM25037 buck controller. The board is able to provide voltage or current feed-back sense and is capable of providing a synchronous or non-synchronous switching frequency. It can be used to evaluate a variety of applications, such as LED drivers, power supplies, distributed power systems, and more.

The evaluation board has a wide input voltage range of 4.5–134 V, and is able to deliver an output voltage range of 0.8–30 V. It is capable of delivering up to 6.2 A of output current, and it includes all of the necessary components required for a complete power converter. This makes it an ideal platform for prototyping applications and for evaluating various design parameters.

Working Principle of the LM25037EVAL/NOPB

The LM25037EVAL/NOPB evaluation board employs a fixed frequency non-synchronous buck (step-down) controller. The board is designed to operate with an input voltage of 12.0V or greater and can provide an output voltage of 0.8V to 30V, depending on the chosen application.

The board utilizes the LM25037 buck controller and an N-channel power MOSFET, the IRF4468. The LM25037 is a fixed frequency non-synchronous buck controller, designed to deliver up to 6.2A of output current. The IRF4468 power MOSFET offers low on-resistance RDS(ON) and high power dissipation capabilities,up to 70A and 43W.

The LM25037EVAL/NOPB also includes an FB29A power factor correction (PFC) circuit, a PFC boost diode, and an N-channel MOSFET with a sense resistor. The PFC boost diode and MOSFET act together to ensure maximum efficiency. The MOSFET acts as a switch to start the PFC boost cycle and the Sense resistor is used to measure the peak power. The FB29A circuit is then used to measure the average power and adjust the control loop accordingly.

In order to ensure stability and reliable operation, the LM25037EVAL/NOPB includes an adjustable frequency compensation network and a pulse-by-pulse current limit circuit. The adjustable frequency compensation network ensures stability by providing the necessary frequency dynamics according to the load conditions. The pulse-by-pulse current limit circuit will ensure protection against over-current conditions and will shut down the device in the case of a fault or short circuit.

The LM25037EVAL/NOPB evaluation board also includes features such as an enable pin, a soft-start circuit, a current limit combination selection, and an adjustable output voltage. The enable pin can be used to enable or disable the regulator, while the soft-start circuit can be used to reduce the inrush current. The current limit combination selection allows the user to choose between voltage and current feed back for more precise regulation. Lastly, the adjustable output voltage feature allows the user to adjust the output voltage according to the chosen application.

Conclusion

In conclusion, the LM25037EVAL/NOPB evaluation board is a powerful and efficient platform for DC/DC and AC/DC (off-line) SMPS applications. This article has discussed its application field and the working principle of the board, as well as the key features and components that make it an ideal platform for prototyping and evaluating design parameters. The LM25037EVAL/NOPB evaluation board can provide a cost-effective solution for designers who need to evaluate their power supply designs and achieve optimum performance.

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