Am 01.09.2016 um 05:35 schrieb Charles Steinmetz:
The suggestion to use LT3042s is a good one, but note that it has an
output current rating of 200mA. The Tbolt needs ~250mA at +5v, and
~700mA at +12v [at startup -- but only ~150mA steady-state, depending
on ambient temperature]. LT3042s can be used in parallel, so two of
them for the +5v supply and four of them for the +12v supply would be
required. That isn't so bad for the +5v supply, but seems excessive
for the +12v supply (particularly when three of the four are needed
only during warmup from cold).
I have made a stamp-sized layout for LT3042 + external npn power transistor
as shown in the data sheet.
Not fabricated, let alone tested.
The LT3088 and LT3080 will deliver 800mA and 1.1A, respectively, with
low noise (but not as low as the LT3042). One of those might be a
better choice for the +12v supply. Similarly, the LT3085 can deliver
500mA, so one of those could be used for the +5v supply.
Finally: Linear Technology -- Where is our negative-voltage complement
to the LT3042?
Yes, that is badly missing.
regards, Gerhard
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