[time-nuts] Anybody want a Thunderbolt power supply

Gerhard Hoffmann 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.

regards, Gerhard
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