I'm building a small regulator for a project I'm working on, and I happen to need 12VDC for the main application, as well as a 5VDC rail for powering a Raspberry Pi 3 and some shift registers. Since the 5 VDC rail is going to consume around 3-4 A I thought burning of the unnecessary voltage with a linear regulator was a bit too excessive, and since space is at a premium, I decided to go with a commercially available DC/DC converter.
The datasheet isn't the worlds greatest, but so far I've been able to deduce the following:
- I need a resistor for the trim option to select the appropirate output voltage
- A Low ESR output capacitor is needed to smooth out the ripple
- The Output Enable can apparently be left floating if not needed
However, what I can't really get my head around is if I need some sort of input capacitors as well (they've spec'ed the suggested minimum input capacitor as OSCON 16V/270µF (ESR 18 mΩ max.)), the datasheet has some mention of a 100nF ceramic and a 10uF tantalum capacitors, but I can't tell if it's only for some measurement setup?
Also, the capacitor they've spec'ed (OSCON 6.3V/680µF (ESR 13 mΩ max.)) seems to be rarer than hens teeth, so I'm thinking of substituting it with this capacitor.
Am I missing something else?
The whole board will be fed from a Meanwell 12VDC PSU.