rtd IPWR104HR-100W, User Manual

Page: 19 / 29

IPWR104HR 19
RTD Embedded Technologies, Inc
Onboard status LED’s
The IPWR104HR is equipped with three voltage-LEDs. These LEDs are near the
edge on the board and labeled +5V, +12V, and -12V. If these LEDs are evenly
lighted then the board voltages are in specification. If they are unevenly lighted,
check the output voltages.
Output power calculations
The maximum available power for the +5V computer system can be estimated
using the following formula:
I1 = (+12V output current)
I2 = (-12V output c -5V output current to ISA bus)
I3 = (+5V auxiliary output current)
I4 = (+5V output current to bus)
Load = (I1*12)/0.922 + (I2*12)/0.838 + (I3*5)/0.836 + (I4*5)/0.836
Load < 60W or Load < 100W
The absolute maximum long-term output figures are:
+12V -> 2.0A
-12V -> 0.5A
+5V -> 12A for 60Watt module and 20A for 100Watt module
Note: Even though the total output power is not exceeded you must remember not to overload an individual output! Care must
be taken not to thermally overload the unit. The maximum specified output power may not be available if the ambient
temperature rises, and in this case additional heat sinking or airflow may be necessary. See the following passage for
more information on thermal behavior of your IPWR104HR.