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LM5190-Q1: 30A 20V CC/CV controller

Ondřej Šebesta
Prodigy 10 points
Part Number: LM5190-Q1
Other Parts Discussed in Thread: LM5190

Tool/software:

Hello,

could you please recommend a suitable solution for designing a converter with adjustable constant current output?

I would like to use, for example, LM5190 or something similar.

The parameters that the converter must meet are as follows:

  • Adjustable output current range: 0-30A
  • Output voltage range: 0-20V
  • Input voltage: 24V
  • Current setting via an analog value, PWM, or I2C bus

The device will be used for electrolysis of saltwater. The conductivity of the water varies over a wide range, so a large output voltage range is required. The output current of 30A will mostly be achieved at voltages between 5-12V. The maximum power drawn from the converter will be around 250W (at higher voltages, we will use a lower current than 30A).

I’ve looked into various solutions, but I always encounter limitations. Either the converter can handle high currents but only at around 5V, or it can handle higher voltages but only up to 10A current.

For example, the LM5190 has a specified maximum current of 20A. Since the current does not pass through the driver but through external MOSFETs, why is the output current limited to 20A? I have noticed similar issues with other converters as well.

I’m also considering implementing my own current feedback according to SNVAA85 – AUGUST 2023, but I haven’t found any buck converter that can handle 30A at 20V.

Thank you

  • 0
    TI__Guru 51961 points

    Hello Ondrej

    • Targeting 0A in CC mode is possible using LM5190, but the output voltage regulation below 0.8V is not possible.  Would you please double check the minimum controllable current and voltage requirements again ?  
    • LM5190 accepts analog signal input at the ISET pin.
    • 20A is a guideline which customers can achieve without a very special cooling method. 30A is possible if you have an active colling or ambient temperature is not so much high.  

    -EL