A customer of ours is looking at the following DC power architecture and they are asking for some application help.
Input:
+ 24
VDC
Outputs:
+5 VDC @ 4 Amps (20 W)
+15 VDC @ 2 Amps (30
W)
-15 VDC @ 1 Amp (15 W)
-2.5 VDC @ 1 Amp (2.5 W)
Would
it be better to drop the 24V down to 15, and then use it to generate the 5 ? If so, is
there a 4+ Amp version of the PTN78060H or can I get away with using 2,
PTN78020W; one configured at 15 and the other at 5?
The same goes for the -15 to -2.5?
And it looks like the PTN78000A can only make it down to
-3V. Got one the same 'sept different that can get down to -2.5V?
I noticed there were a few parts that can take
+5 V and spew negative voltages (PT6911, PT6913, PT6914), but I'm not sure
they're my best choices, or if they are which is the best for my application.
Please advise :-)
And the other
usual questions without me reading the specs in detail:
Can these modules dissipate the heat generated
without convection (fan), conduction (heat sink), or LN2 (finally
something we have lots of) cooling? The 24V input can go as high as 28V.
I have to drive a 24 bit ADC and
associated circuitry with these modules. Am I going to fight an uphill battle
using them? If so, are there design guidelines on interfacing these modules to a
low noise system (put them in a faraday cage 10 metric inches from the ADC,
interconnect with 00 gauge unobtainium superconducting wire, etc.)?
