Table of Contents
Advertisement
26
ST39251
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 10.32 watts
(35.2 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 10.7
watts (36.6 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 7 and 8). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the cor-
responding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour,
multiply watts by 3.4123.
1.800
1.600
1.400
1.200
1.000
0.800
0.600
0.400
ST39251
Figure 9.
DC current and power vs. input/output operations per second (SE)
1.800
1.600
1.400
1.200
1.000
0.800
0.600
0.400
Figure 10.
ST39251
DC current and power vs. input/output operations per second (LVD)
0
50
100
I/Os per Second
0
50
100
I/Os per Second
Cheetah X15 Product Manual, Rev. C
150
200
250
150
200
250
5V A
12V A
Watts
17
15
Watts
13
11
300
5V A
12V A
Watts
17
15
Watts
13
11
300
Advertisement
Table of Contents
