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lm2576-adj


Hello I have a problem with the regulator lm2576t-adj that warms me up with just 1 amper of consumption, I feed it with a transformer of 2 amper 15 volt and I want to get a current of 1.3 amper in 14 volt and the integrated heats too much, Has a heatsink but the hour can not be played has an inductor of 150 uh and capacitor input of 100uf and output 1000 uf

  • Hi Leonardo,

    your input voltage is 15V and the desired output voltage is 14V??

    If this is correct you will most probably exceed the maximum duty cycle of this device.

    You either have to increase the input voltage or decrease the output voltage.

    Best regards

    Carsten

  • In reply to Carsten Koeck:

    Hello
    If I have a voltage of 15 volt at the input and a 14 at the output, what voltage do they have to have, what difference between the input and the output?
    I will manufacture the toroid of which material have to be U300 permeability okay?
    And if I put 60uh is ok to get more current?
    And finally I feed it with a transformer, bridge of diodes of 4 amper and capacitor of 4700uf that is well?
  • In reply to Leonardo Padovano:

    And I have the problem that the voltage drops, I put 12 volts and a charge of 1 amper and it drops 11.2 volts I do not know why!

  • In reply to Leonardo Padovano:

    You should consider 1.4V as the minimum drop you will see between input and output.
    The value of your inductor should be at least 86uH better would be 100uH.
    Please make sure the inductor is not saturating so choose an inductor with the necessary current needed.
    The easiest way to have a starting point would be to start a Webench design using the LM2576

    Carsten
  • In reply to Carsten Koeck:

    Holla, I did a lot of tests I put a bigger inductor, it works well it delivers the amps and it keeps the current, but the heatsink heats that it can not be touched and the voltage drops 1 volt and I do not know what else to change
  • In reply to Leonardo Padovano:

    Hello, I do not have a voltage drop only 50 mv in 1.5 quite well, but the temperature is high warms up I'm thinking of using the lm2596 because I can not find a solution!

  • In reply to Leonardo Padovano:

    Did this ever get resolved?

    Best  Regards,

    John Tucker

    BSR-CCP LV/MV DC/DC Applications

  • In reply to JohnTucker:

    I could solve half, change the pcb and put a best inducer and solve the voltage drop and temperature 12 1.5 volt ampere was 60 degrees, with a drop of 100 mVolt

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