Author Topic: Can you run multiple isolated DC/DC converters in parallel for more current?  (Read 3718 times)

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Offline ivanjhTopic starter

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I have a scenario where I need  ~200mA @ 12V isolated from the main 12V supply.

The B1212LS-1W is rated at 83mA - http://www.mornsun-power.com/UploadFiles/pdf/A_S-1W%20&%20B_LS-1W_EN.pdf

They're an unregulated unit.

Would there be any problem with getting 3 and wiring them up in parallel?
 

Offline Psi

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Should be fine, but i would put a low value resistor in series with each.
It's not really needed but i would do it anyway.
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Offline ivanjhTopic starter

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Should be fine, but i would put a low value resistor in series with each.
It's not really needed but i would do it anyway.
Is that to provide a minimal required load?
 

Offline Psi

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na, i mean in series to the higher current VCC point

unit1 +out ---res ---|
unit2 +out ---res ---|------ output +
unit3 +out ---res ---|

unit1-3 -out --------------- output -

It's just to provide a little give and take for the slightly different voltages out of each unit.
It can also help to stop a bad unit from taking down the others in some situations.
« Last Edit: August 19, 2012, 10:30:44 am by Psi »
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Offline Rerouter

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if there all isolated using your diodes to share the current will do the same,

out of curiousity what wattage and topology are you working with,? i myself am struggling with choice on higher wattage switchmodes,
 

Offline Psi

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yeah, diodes are better if you can tolerate the voltage drop.
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