How to Get a Stable 24V Output from a Battery Source Ranging from 21V to 29.4V (25.9V battery,5200mah)

[mbed_engr]

Hi Team,

We have designed our own SMPS with a charger board, which converts 230V AC to 24V DC. In this design, we used an LM2596 buck converter circuit to limit the voltage to 24V when the battery is fully charged (29.4V). However, the output voltage drops when the battery voltage goes below 24V.

Our requirement is to maintain a stable 24V output with a minimum of 3A, regardless of the battery voltage fluctuations (ranging from 21V to 29.4V).

We also tried using a buck-boost converter like the XL6019E1, which can boost the input voltage (e.g., 20V to 24V). However, when the battery charges above 24V, the output voltage increases, which is not desirable.

Could you kindly suggest a solution to maintain a stable 24V output under these conditions?

Looking forward to your guidance.

Best regards,
mbed egnr

[mƎALLEm]

Hello

LM2596 and XL6019 are not ST products. Better to ask your questions on their respective provider communities: TI and XLSEMI.

[mbed_engr]

suggest any st product, we will try it.

kindly, reply as soon as possible

[Andrew Neil]

What you require is called a "buck/boost" converter - that is, it can either reduce ("buck") or boost its input voltage to give the required output.

https://www.st.com/en/power-management/buck-boost-regulators.html