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Cheetah 73LP FC Product Manual, Rev. D 23
6.3 Power dissipation
ST373405FC
Typical power dissipation under idle conditions is 11.3 watts (38.6 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. ST373405FC DC current and power vs. input/output operations per second
ST336605FC
Typical power dissipation under idle conditions is 9.6 watts (32.8 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. ST336605FC DC current and power vs. input/output operations per second
0.400
0 50 100
I/Os per Second
Amperes
150
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
0.400
0 50 100
I/Os per Second
Amperes
150
0.600
0.800
1.000
1.200
11
13
Watts
15
17
1.400
1.800
1.600
200 250
5V A
12V A
Watts