[time-nuts] Anybody want a Thunderbolt power supply
dk4xp at arcor.de
Thu Sep 1 00:56:59 EDT 2016
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.
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