Seagate ST3450856FC Manuale Utente
24
Cheetah 15K.6 FC Product Manual, Rev. A
[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 330 I/Os per second for ST3450856FC and
Table 3:
DC power requirements for ST3300656FC 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]
0.45
0.68
0.48
0.68
0.53
0.67
Maximum starting current
(peak DC) DC
3
σ
[3]
0.62
1.77
0.64
1.78
0.83
1.78
(peak AC) AC
3
σ
[3]
0.74
4.27
0.84
4.15
1.15
4.23
Delayed motor start (max) DC
3
σ
0.43
0.04
0.45
0.04
0.50
0.04
Peak operating current:
Typical DCX
[1] [6]
0.48
1.09
0.58
1.09
0.58
1.08
Maximum DC
3
σ
[1]
0.50
1.11
0.61
1.11
0.59
1.11
Maximum (peak) DC
3
σ
0.98
2.62
1.12
2.66
1.16
2.72
Table 4:
DC power requirements for ST3146356FC 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]
0.55
0.53
0.58
0.53
0.64
0.53
Maximum starting current
(peak DC) DC
3
σ
[3]
0.69
1.82
0.72
1.81
0.98
1.81
(peak AC) AC
3
σ
[3]
0.84
3.85
0.88
3.79
1.17
3.90
Delayed motor start (max) DC
3
σ
0.49
0.03
0.52
0.03
0.59
0.04
Peak operating current:
Typical DCX
[1] [6]
0.63
0.92
0.66
0.91
0.69
0.91
Maximum DC
3
σ
[1]
0.63
0.95
0.66
0.95
0.71
0.94
Maximum (peak) DC
3
σ
1.10
2.40
1.16
2.46
1.20
2.48