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Plug-in PCB into 400Vdc...?

cupoftea

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Hi,
We want a LNK30x HV Buck bias supply on a little plug-in PCB which will be plugged in to a socket through which it receiveS its 400Vdc input. It will not be hot plugged or unplugged. Its output back to the main board is 12vdc 160mA.

Do you think this kind of connector system is ok for this voltage?

LNK30x

M20-783** Socket on main board with 400Vdc

MC34773 on the little LNK302 PCB
 

FvM

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You need to keep clearance and creepage distances according to applicable standards for the respective PCB material and enviromental conditions. You'll typically leave out contact positions between the HV pins.
 

cupoftea

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You need to keep clearance and creepage distances according to applicable standards for the respective PCB material and enviromental conditions.
Thanks, sorry, this is purely for prototype work, so can we avoid those considerations?

Even if we have just 0.3mm between 400vdc and 12vdc then it will be ok...(wont flash over)...and there'll be solder resist over the traces......mind you , bare soldered pins could be 0.3mm apart......will it flash over?........
I beleive flash-over distance (in air, or along a PCB surface) for 1kV is some 300um?
 

KlausST

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Thanks, sorry, this is purely for prototype work, so can we avoid those considerations?
Are you asking a forum member for the permit not to follow safety regulations?
And what if something happens?

My opinion:
You may do whatever you want, as long as you take responsibility for it.

Klaus
 

wwfeldman

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Even if we have just 0.3mm between 400vdc and 12vdc then it will be ok...(wont flash over)... .... bare soldered pins could be 0.3mm apart
0.3 mm? Really?

where did the general preoccupation with TINY become the standard?
just because apple gets away with the smallest ...
and doesn't put connectors on the newer laptops,
doesn't mean you have to

if the traces were 1 mm apart, or G-d forbid, more, how much bigger does your gadget get?
what is the trade off between cost, size, and reliability?

and its a prototype - build it, make it work, then shrink it, if that's what you want

I agree with Klaus. safety first
 

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