14 Apr
2008
14 Apr
'08
2:58 p.m.
Rik wrote:
The PSU isn't build by HP but by RTE POWER/MATE a
firm with doesn't exist
any more.
That explains it. If HP bought the PSU as an assembly, there wouldn't
be HP part numbers for its components, as it would be considered a single
FRU.
From Tony's schematic, I'd guess that it's
a semi-custom part. Motorola
probably binned one of their standard parts to a
higher spec for RTE.
Perhaps you can look at schematics for other switching PSUs
with similar ratings and determine what transistor they use. The
safety-critical parameters are breakdown voltage and maximum current.
If the PSU is rated at less than 500W, I suspect you could use a BU208A,
which costs less than $3 from Digikey, but don't take my word for it.
Eric