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LMZ14203TZ-ADJ

henry schaier
Prodigy 10 points

We are using this switching regulator on many boards.  I am having problems with the 10uF capacitor in terms of physical size on some of our pcbs.  I replaced the Taiyo Yuden cap PN: UMK325BJ106MM-1 with a Kemet equivalent C1210C106M5R2C7186. The reason for the switch I had problems with the recommended 1uF Taiyo Yuden cap burning up on the board. I had 4 caps literally melt off the board. I decided to use American made caps. The problem I have the Kemet uses two 4.7uF in parallel soldered together with a tin clip. the height is a problem and the strength of the solder joint is in question.

The question is:

  • Can I use a 4.7uF 50V cap to replace the 10uF 50V cap?
  • Can I use a 10uF 50V tantalum cap? i realize the tantalum will shut down in the hundreds of kHz, the ESR is higher.

My use is 24VDC is coming from a 110V:24VDC 5A din rail power supply. This ps supply delivers power to all the various boards in my system whcih is mounted in a Schneider NEMA 4 enclosure.

  • 0
    TI__Mastermind 19891 points

    Hello Henry, 

    You may be able to use 4.7uF ceramic. You will have more ripple on the input but it may still be OK. 

    You should be careful about using tantalums for your input. Usually tantalum caps have limited inrush surge current capability and can fail catastrophically (i.e. catch on fire). I would be especially careful if you have a hot pluggable input.

    One question is why were you burning up the caps? Could you share your board layout and output voltage condition?

    Regards, 
    Denislav