© National Instruments Corporation 33 NI sbRIO-961x/9612XT/963x/9632XT/964x/9642XT
If you add heat sinks to the output transistors U49–U56 and U110–U117,
such that the measured case temperature of the transistors remains below
65 °C at ambient temperature of 55 °C, each channel can drive up to 1.5 A.
However, the total current through all channels must not exceed 20 A.
1
Use
a heat sink that dissipates 0.5 W for each transistor driving up to 1.5 A. For
example, for four transistors, each driving 1.5 A, use a 2 W heat sink.
Table 5 shows the channels associated with the output transistors.
1
The 20 A total-current limit is based on the maximum current rating of the DSUB connector pins, 5 A, multiplied by 4, the
number of V
sup
pins.
Table 5. Transistors Associated with DO Channels
DO Channels Transistor
0, 1 U49
2, 3 U50
4, 5 U51
6, 7 U52
8, 9 U53
10, 11 U54
12, 13 U55
14, 15 U56
16, 17 U117
18, 19 U116
20, 21 U115
22, 23 U114
24, 25 U113
26, 27 U112
28, 29 U111
30, 31 U110
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