Seagate ST3146855FC Manual Do Utilizador
24
Cheetah 15K.5 FC Product Manual, Rev. D
[1]
Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these val-
ues. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.
ues. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.
[2]
For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching
15000 RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been
completed and that the drive is able to accept selection by the host initiator.
15000 RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been
completed and that the drive is able to accept selection by the host initiator.
[3]
See +12V current profile in Figure 1.
[4]
This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start
Motor command.
Motor command.
[5]
See paragraph 6.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and
transient response.
transient response.
[6]
Operating condition is defined as random 8 block reads at 309 s I/Os per second for ST3300655FC and
Table 3:
DC power requirements for ST3146855FC model
1 Gbit
2 Gbit
4 Gbit
Notes
(Amps)
(Amps)
(Amps)
(Amps)
(Amps)
(Amps)
Voltage
+5V
+12V [2]
+5V
+12V [2]
+5V
Regulation
[5]
±5%
±5% [2]
±5%
±5% [2]
±5%
±5% [2]
Avg idle current DCX
[1] [7]
0.77
0.54
0.79
0.53
0.84
0.53
Maximum starting current
(peak DC) DC
3
σ
[3]
0.78
2.08
0.80
2.08
0.86
2.08
(peak AC) AC
3
σ
[3]
1.18
3.70
1.17
3.70
1.27
3.65
Delayed motor start (max) DC
3
σ
0.44
0.03
0.47
0.03
0.52
0.03
Peak operating current:
Typical DCX
[1] [6]
0.62
0.89
0.76
0.88
0.52
0.87
Maximum DC
3
σ
[1]
0.75
0.93
0.77
0.94
0.80
0.93
Maximum (peak) DC
3
σ
1.54
2.68
1.54
2.70
1.60
2.62
Table 4:
DC power requirements for ST373455FC model
1 Gbit
2 Gbit
4 Gbit
Notes
(Amps)
(Amps)
(Amps)
(Amps)
(Amps)
(Amps)
Voltage
+5V
+12V [2]
+5V
+12V [2]
+5V
+12V [2]
Regulation
[5]
±5%
±5% [2]
±5%
±5% [2]
±5%
±5% [2]
Avg idle current DCX
[1] [7]
0.76
0.41
0.83
0.42
0.84
0.41
Maximum starting current
(peak DC) DC
3
σ
[3]
0.77
2.02
0.80
2.02
0.84
2.02
(peak AC) AC
3
σ
[3]
1.10
3.51
1.17
3.57
1.29
3.48
Delayed motor start (max) DC
3
σ
0.45
0.03
0.49
0.03
0.53
0.03
Peak operating current:
Typical DCX
[1] [6]
0.69
0.73
0.74
0.74
0.78
0.76
Maximum DC
3
σ
[1]
0.71
0.79
0.77
0.79
0.81
0.80
Maximum (peak) DC
3
σ
1.42
2.46
1.54
2.48
1.56
2.50