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Evaluation Boards - DC/DC & AC/DC (Off-Line) SMPS

The LM5039EVAL/NOPB is an evaluation board developed and used to evaluate the performance of the LM5039 Off-Line PWM Controll with Integrated Power Transistor. The LM5039 is a peak current mode, single ended forward converter with integrated power transistor and design features that are ideal for flyback and offline topologies. This application field and working principle will be discussed further in this paper.

Application Field of LM5039EVAL/NOPB

The LM5039EVAL/NOPB’s application field typically includes isolated DC/DC converters with flyback or offline topology designs, such as PC supplies, adapters, battery chargers, etc. It is also suitable for powering FPGA, ASSP, and ASIC type devices. The operating and maximum junction temperatures of the evaluation board range from 0°C to +85°C. The input voltage range is from 170Vac to 250Vac, with 220Vac as nominal voltage.

Working Principle of LM5039EVAL/NOPB

The evaluation board works using a peak current mode single ended forward converter with an integrated power transistor. The integrated power transistor allows for reduced conduction losses and increased power density of the converter. The control loop determines the peak current across the inductor, allowing for improved stability, increased efficiency and light load performance. It also enables the use of smaller magnetics with less total components, which further increases efficiency and power density. The operation of the converter is further explained below:

• The voltage VIN (input voltage) is applied across the bridge rectifier.
• The output of the bridge rectifier is a DC voltage which is then provided to the primary winding of the transformer.
• As the primary winding receives a voltage, the current begins to increase. When the End of Cycle signal is received by the LM5039 controller, the peak current across the inductor is determined. The controller then reduces the output voltage of the LM5039 to shut off the integrated power transistor. This then stops the current flow, allowing the inductor current to discharge into the output capacitor, increasing the output voltage.
• While the output voltage is low, the peak current across the inductor is determined by the signal of the voltage divider resistor. When the output voltage reaches its desired level, the inductor current is reduced.
• At this point, the controller is ready to start the next cycle, and the above process is repeated.

Features of the LM5039EVAL/NOPB Evaluation Board

The LM5039EVAL/NOPB evaluation board comes with features that make it suitable for a variety of applications. It has a wide input voltage range of 170Vac – 250Vac at nominal 220Vac, allowing for compatibility with world-wide mains standards. The board has a peak current mode control with high speed feedback loop and voltage-mode control with outstanding voltage regulation. The evaluation board comes with an integrated power transistor for reduced conduction loss and increased power density. Lastly, the board comes with contemporary safety listed components such as a Temperature Protection alarm, an inrush protection circuit, and a snubber circuit.

Conclusion

To sum up, the LM5039EVAL/NOPB evaluation board is an efficient and reliable device that is suitable for a variety of applications, such as isolated DC/DC converters with flyback or off-line topology designs, PC supplies, adapters, batter chargers, etc. The device is equipped with contemporary safety listed components, has a wide input voltage range of 170Vac – 250Vac at nominal 220Vac, operates with peak current mode control, and also features an integrated power transistor for reduced conduction loss and increased power density. As such, the LM5039EVAL/NOPB is a great device for designers working on flyback or offline topology designs.

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