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Cheetah 36XL Product Manual, Rev. E
ST318405
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 8.0 watts
(27.3 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 8.0
watts (27.3 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 10). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corre-
sponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, mul-
tiply watts by 3.4123.
1.2
1.0
0.8
0.6
0.4
0.2
0.0
4
Figure 10.
ST318405 DC current and power vs. input/output operations per second
6
11
16
24
I/Os per Second
33
45
82
122
14
5V A
12V A
12
Watts
10
8
Watts
6
4
2
0
155
29
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