Product manual

Cheetah 36LP FC Product Manual, Rev. C 25
6.3 Power dissipation
ST336704FC
Typical power dissipation under idle conditions is 12.0 watts (40.95 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
7). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by
3.4123.
Figure 7. ST336704FC DC current and power vs. input/output operations per second
ST318304FC
Typical power dissipation under idle conditions is 9.6 watts (32.76 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
7). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by
3.4123.
Figure 8. ST318304FC DC current and power vs. input/output operations per second
0.400
0 50 100
I/Os per Second
Amperes
150 250
0.600
0.800
1.000
1.200
11
13
Watts
15
17
19
1.400
1.800
1.600
200
5V A
12V A
Watts
0.400
0 50 100
I/Os per Second
Amperes
150 250
0.600
0.800
1.000
1.200
11
13
Watts
15
17
1.400
1.800
1.600
200
5V A
12V A
Watts