National Instruments sbRIO-9605 - Page 55

© National Instruments 55 NI sbRIO-960x/962x/963x OEM Instructions & Specifications
The total power required by the NI sbRIO device from its power supply
depends heavily on how it is being used, and can be approximated by the
following calculations:
Total power requirement = P
int
+ P
DIO
+ P
5V
+ P
USB
where P
int
is the power consumption by the NI sbRIO device internal
operation, including integrated I/O functions
P
DIO
is the power consumption by the 3.3 V DIO lines across
the RMC, MIO, or DIO connectors
P
5V
is the power consumption by the 5 V voltage output across
the RMC or MIO connectors
P
3.3V
is the power consumption by the 3.3 V voltage output across
the RMC Connector
P
USB
is the power consumption of a device plugged into the USB port
P
SD
is the power consumption of an SD card plugged into the SD slot
P
AO
is the power consumption of the Analog output across the
MIO connector
When calculating each component of the maximum power consumption the
following efficiency factors must be used:
η
3.3 V
, η
DIO
and η
SD
= 80%
η
5 V
and η
USB
= 90%
η
AO
= 50%
P
AO
is the power consumption of the Analog output across the MIO
connector
Note You must add 10% to the calculated or measured total power requirement to account
for transient and startup conditions.
Maximum P
int
......................................... Refer to Table 13.
Maximum P
DIO
....................................... Total DIO current × 3.3 V / 0.8
Maximum P
5V
........................................ Total 5 V current × 5 V / 0.9
Maximum P
3.3V
...................................... Total 3.3 V current × 3.3 V / 0.8
Maximum P
USB
...................................... Total USB current × 5 V / 0.9
Maximum P
SD
1
....................................... Total SD current × 3.3 V / 0.8