Let's talk about isolated DC to DC converters, Traco, Recom, XP etc

J

jwin615

Well-known member
I figured instead of spending hours looking at datasheets, I'd at least ask the peanut gallery.
I'm looking for a series of iso DC-DC converters that meet the following criteria
1)dual rail out, tight tolerance, preferably 200mA, minimum 100mA*
2)9V input
3)models with fixed 5, 9, 12 volt bipolar out*
4)same footprint and pinout for each model*
5)Bonus if there are single output models (18v) with the same pinout and footprint
6)sub $15
7)smaller = better would prefer a taller package over a wider one
*=Easily found

Obviously, less ripple and noise is a plus.

The RECOM RH/RK/RP(I believe I have that right) are all pin compatible but I'm not so sure about the drift of unregulated ones.

The TRACO TEC line looks promising.

Anyhow, anyone done a bunch of homework on these and have any opinions or advice?
Thanks in advance.
 
I have the Traco TEC 2-0923 in an HPF/PEQ box on my test bench right now. At only 67mA for each rail @ +/- 15V it doesn't meet your criteria, but for my purposes it seems to be working very well so far.
 
Digging into the datasheets again...
Meanwell modules still look like the sweet spot of price/performance to me. A few different ones at 50-75mv ptp ripple, 100khz switching and, 100-220ma out, and generally able to drive higher capacitive loads. All in that $5-8 price range for 2 watt models.
DPAN02 2 watt share the same footprint and pinout as the DPW03 3 watt
 
Passinwind said:
I have the Traco TEC 2-0923 in an HPF/PEQ box on my test bench right now. At only 67mA for each rail @ +/- 15V it doesn't meet your criteria, but for my purposes it seems to be working very well so far.
Click to expand...
I think a 1 watt converter would absolutely be suffecient in many cases, but I always like the idea of overbuilding, especially when it comes to power. I'll never need a 3 watt unit, but it's nice to know it could fit in a 2w footprint if needed or availability was an issue.
 
jwin615 said:
I think a 1 watt converter would absolutely be suffecient in many cases, but I always like the idea of overbuilding, especially when it comes to power. I'll never need a 3 watt unit, but it's nice to know it could fit in a 2w footprint if needed or availability was an issue.
Click to expand...
If you want to give that Traco model a test spin I'll be happy to share my daughtercard layout for it. That pricing is for 3 boards from OSHpark, shipping included.

1750348612089.png
 
Thanks. Slowly trying to work out catch all daughterboard myself.
Are you running an LC on the in and out and a single cap across each output leg?
 
jwin615 said:
Thanks. Slowly trying to work out catch all daughterboard myself.
Are you running an LC on the in and out and a single cap across each output leg?
Click to expand...
CLC on the input and LC on each output, a "big" electrolytic and a small value bypass cap on each output leg. I just copped the design from some commercial pedal, but it was like three years ago and I don't remember which one.
 
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