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LM3401: Battery charger for 24V lead acid battery

Nikolaus Ng
Intellectual 390 points
Part Number: LM3401

Hi experts,

      We would like to use LM3401 as a constant voltage constant current source in float charging a 24V lead acid battery, the requirement is as below :

1) Output 27.3V when current consumed is lesser than 0.6A (Voltage in range 27.0V to 27.5V is ok)

2) When current consumed more than 0.6A, the circuit will limit to 0.6A with the voltage applied to battery lowered down

Questions here:

1)  Is this device suitable for this application ?

2) If the current is lesser than 0.6A, the voltage apply to the battery will equal to Vin ? How much voltage loss will there be ? Is it ok applying 27.5V DC to the LM3401 Vin ?

     Thanks.

      

  • 0
    TI__Mastermind 25500 points

    Hello Nikolaus,

    I'm not sure if the LM3401 is a fit exactly because I'm not 100% sure exactly how you are trying to implement it. But it is a switching current regulator so it is designed to give a constant current but the load voltage is dependent on the load, it does not regulate voltage. If that is all you need is a current source it will work well. It can take 27.5V at the input and the maximum voltage drop depends on the conditions and your FET. If Vin gets very close to Vout it will go into 100% duty cycle mode so the drop is just across the FET Rds(on). But it cannot fully regulate current in 100% duty cycle mode, but it will be lower than the nominal current setpoint.

    Regards,

    Clint