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Forum PROBLEM whith MAX17632C
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PROBLEM whith MAX17632C

Fabrizio70
Fabrizio70 over 1 year ago

v   image

Hi , I have a problem whith  max17632c i use it for dc/dc 24v/5v  .if i put  i small load ( 100mW) the output voltage is 4,0V  , while i put a load of  2W  tthe output voltage go to 2,5V.

then i desolder  the condensator  C1 (2,2 uF 10V ceramic used for bypass ldo pin 2) and i have 5v output  whit load of 2W (the condensator  not  have problem) , Where is the prblem?

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  • baldengineer
    baldengineer over 1 year ago +1
    Since it is a switching regulator, we need to see the PCB. I always suspect layout issues first with switchers. It would also be nice to see the entire schematic. Like with code, snippets rarely contain…
  • Fabrizio70
    Fabrizio70 over 1 year ago in reply to dougw +1 verified
    The output voltage whiout load and c1 installade is 5,09 V , while whit load of 2W and c1 installated is 2,35 v and the voltage on the C1 is 5,06 if i dessolder c1 the output voltage is right 5.06 whit…
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  • dougw
    0 dougw over 1 year ago

    What is the voltage at VCC when the cap is installed?

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  • Fabrizio70
    +1 Fabrizio70 over 1 year ago in reply to dougw

    The output voltage whiout load  and c1 installade is 5,09 V , while  whit load of 2W and c1 installated is 2,35 v and the voltage on the C1 is 5,06  if  i dessolder c1  the output voltage is right 5.06 whit load of 2W

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  • baldengineer
    0 baldengineer over 1 year ago in reply to Fabrizio70

    Are you looking at the output with an oscilloscope or a DMM?

    Remember, DMMs do not show you the full picture with a switch-mode regulator,

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  • Fabrizio70
    0 Fabrizio70 over 1 year ago in reply to baldengineer

    whith multimeter, if i use oscilloscope i measure a ripple of 1v on pin 2 (VCC) WHITOUT C1 while whit  c1x the riplle is a some mV but the output (MEASURE ON c19)  whitl load is 2,35V

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  • Fabrizio70
    0 Fabrizio70 over 1 year ago in reply to baldengineer

    whith multimeter, if i use oscilloscope i measure a ripple of 1v on pin 2 (VCC) WHITOUT C1 while whit  c1x the riplle is a some mV but the output (MEASURE ON c19)  whitl load is 2,35V

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