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LMZM23601: Can't drive high capacitive load

Carmelo Rigano
Prodigy 20 points
Part Number: LMZM23601

I used the schematic attached on a gsm modem with 1600 uF on input but it doesn't start. On oscilloscope I can view the voltage rise to 3.7V and then go down ciclically.12 to 3.7.pdf

  • 0
    TI__Guru 50120 points

    Hi Carmelo,

    From your description, the output of the LMZM23601 will power a GSM modem that has 1600uF input capacitance. The maximum output capacitance for the LMZM23601 is detailed in Table 5 of the datasheet.For your application of 3.7V it will be somewhere in between 220 uF- 330 uF. Anything above this will this value will trip the internal hiccup circuitry. Since there is a large amount of output capacitance on the LMZM23601, the voltage will take some time to get to the regulated output and the regulator will think this is a short circuit. 

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    Prodigy 20 points
    Hi Jimmy

    many thanks. Il try to remove capacitor from modem.

    regards
    Carmelo