Sundance SMT148 - Manual (Page 16)

Version 1.4 Page 16 of 35 SMT148 User Manual
Power supplies
Power in
Power is supplied from an external source. The voltage of the external source needs
to be in the range +18V +30V. This enters the board via an 8-pin connector (JP6 on
board, Receptacle, mini fit 8 Way, Molex 39-28-1083).
+18-30V 1
+18-30V 2
+18-30V 3
+18-30V 4
GND 5
GND 6
GND 7
GND 8
Table 11 : Power in pinout
The mating part to this connector is a Molex 39-01-2080 (Farnell order code 151-869
+ 8 off 39-00-0039, Farnell 151-890).
The external source is input to a DC-DC converter module, which produces +/-12V to
the TIM sites. It is also used as an input to two DC-DC converters that produce the
+5V, +3.3V, +2.5V and 1.5V supply to the TIM sites, carrier FPGA and other devices.
Power Consumption
The typical current consumption of an SMT148-LT would be 120mA at 24V. For an
SMT148, this would be 280mA.
These are actual measured values with no TIMs fitted.
When TIMs are added, then the power consumption of the TIMs must be added to
that of the SMT148/-LT with the SMT148 power supply efficiency taken into account
(approximately 80%).
Example:
Power consumption of SMT148-LT only = 24*0.12 = 2.88W
Power consumption of TIM, say 3.3V at 1A = 3.3W
Total power consumption = 2.88 + 3.3/0.80 = 7.0W