Hi Joe, I second John's suggestion (we used the same module for a battery powered RFI analysis box), but here are the design limits: 12V - 3.4A 5V - 6.8A 5VAUX - <1A 3.3V - 3.5A
These are assuming a full FPGA running at high clock rate, something that is difficult to achieve in practice, so you can take it as maximum. Regards, Francois On Thu, Jan 19, 2012 at 9:05 PM, Dan Werthimer <d...@ssl.berkeley.edu> wrote: > > hi joe, > > the DC-DC converters are standard on the roach boards, > so you only need to supply 3.3, 5 and 12 volts to the ATX connector. > > if you use john ford's $30 pico-PSU-90, then you only have to supply > one voltage: +12 Volts at 8 amps. > > i'm not sure about the maximum currents for each of the > roaches three input voltages. > i'm cc'ing the casper lists - someone will know. > > i can measure these currents with our clamp on amp-meter, but these will > change a bit, depending on how heavily you load the FGPA and what > ADC's are plugged into the roach board. > > best wishes, > > dan > > > > > On Thu, Jan 19, 2012 at 10:53 AM, Joseph Greenberg <jgree...@nrao.edu> > wrote: >> >> Hi Dan, >> Thanks for the reply. >> >> >> Dan Werthimer wrote: >> >> >> hi joe, >> >> can you leave the DC-DC converters on the roach board? >> >> Yes. Are they standard on all Roach I boards or do we have to specify >> them? >> >> then you only need to supply the 12, 5 and 3.3 volts that >> come from the ATX power supply. >> >> What is the maximum current we would need to supply for each of these >> Voltages? >> >> Thanks, >> Joe >> >> >> >> >> best wishes, >> >> dan >> >> >> On Thu, Jan 19, 2012 at 10:28 AM, Joseph Greenberg <jgree...@nrao.edu> >> wrote: >>> >>> We at NRAO are going to mount the Roach I board on a custom board, rather >>> than using the usual chassis. >>> We will have DC-DC converters on the board. >>> The Roach documentation states: >>> Voltages of 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1V and 1.2V aux rails. >>> >>> Is there any specification of what maximum currents we need to supply for >>> each voltage? >>> >>> Thanks, >>> Joe >>> >> >> > -- Francois Kapp Sub-system Manager Digital Back End meerKAT SKA South Africa Third Floor The Park Park Road (off Alexandra Road) Pinelands 7405 Western Cape South Africa Latitude: -33.94329 (South); Longitude: 18.48945 (East). (p) +27 (0)21 506 7300 (p) +27 (0)21 506 7360 (direct) (f) +27 (0)21 506 7375 (m) +27 (0)82 787 8407
