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5V from mains

M

martin.shoebridge

Jan 1, 1970
0
Can anyone point me in the right direction ? I saw a chip that does this a
long time ago, but can't remember what/where...
TIA
 
P

Peter Heitzer

Jan 1, 1970
0
: Can anyone point me in the right direction ? I saw a chip that does this a
: long time ago, but can't remember what/where...
: TIA
AFAIR the 5V were not isolated from the mains. Perhaps thats not what you
want.
 
W

Walter Harley

Jan 1, 1970
0
martin.shoebridge said:
Can anyone point me in the right direction ? I saw a chip that does this a
long time ago, but can't remember what/where...

Does it have to be a chip? They make 5V switching wall warts now that are
so small they fit inside the mains plug, you can't even really call it a
"wart" any more.
 
R

Roger Hamlett

Jan 1, 1970
0
Walter Harley said:
Does it have to be a chip? They make 5V switching wall warts now that
are so small they fit inside the mains plug, you can't even really call
it a "wart" any more.
Harris semiconductor did the chip that he probably saw, but I don't think
Intersil now do it, it seemed to disappear a while ago. These are ideal
for specific things, such as powering logic circuits inside mains
equipment, where insulation/isolation is provided elsewhere. However for
any application where this is not the case, the minature wall wart
approach is a lot safer. It also simplifies getting approvals, so unless
the production 'run' is large, may well be the better solution. For a non
isolated supply, inside a piece of equipment, the PowerIntegrations
LNK304, is the current popular choice. It is used inside many things like
lamp dimmer assemblies.

Best Wishes
 
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