Table 2. Dc Power Requirements For St410800W/Wd Drives - Seagate Elite 9 Product Manual

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Table 2. DC power requirements for ST410800W/WD drives

[5]
Voltage regulation
Max operating current DC 3σ
Avg idle current DC X
Max start current
(peak) DC 3σ
(peak) AC 3σ
Delay motor start (max) DC 3σ
Peak operating current
Typical DC X
Maximum DC 3σ
Maximum (peak) AC 3σ
Track following at
OD DC X
ID DC X
Read track
OD DC 3σ
AC 3σ
Seeking
Typical DC X
Maximum DC 3σ
Maximum (peak) AC 3σ
Notes:
Measured with an average reading DC a mmeter. Instantaneous +12V
[1]
current peaks will exceed these values.
A −10% tolerance is permissible during initial start of the spindle and
[2]
must return to ±5% before reaching 5,400 RPM. The ±5% must be
maintained after the drive signals that its power-up sequence has been
completed and that it can accept selection by the host initiator.
[3] See Figure 8.
[4] This condition occurs when the Motor Start Option is enabled and the
drive has not yet received a start motor command.
[5] See Section 7.2.1 "Conducted noise immunity." Specified voltage toler-
ance includes ripple, noise, and transient response.
[6] At power-up, the motor current regulator limits the 12V current to an
average value of less than 4.8A, although instantaneous peaks may
exceed this value. These peaks should measure 5 msec duration or
less.
[7] Minimum current loading for each supply voltage is not less than 7% of
the maximum operating current shown.
[8] Use separate ground returns for +5V and +12V supplies.
[9] Where power is provided to multiple drives from a common supply,
carefully consider individual drive power requirements. Where multiple
units are powered on simultaneously, be sure the peak starting current
is available to each device.
continued
Elite 9 Product Manual, Rev. C
Single ended
5V [11] 12V
± ± ± ± ± 5% ± ± ± ± ± 5%
[2]
Notes
Amps
[1] 1.0 1.94
[1] [12] 0.7 1.56
[3] [6] 1.0 4.8
[3] – 5.12
[1] [4] 0.96 0.25
[1] [15] 0.98 1.69
[1] 1.0 1.94
1.1 2.89
[1] 0.97 1.58
[1] 0.96 1.9
[1] [16] 1.03 1.8
1.1 2.1
[1] [13] 0.96 1.95
[1] 1.0 2.2
1.1 2.85
Differential
5V [11] 12V
± ± ± ± ± 5% ± ± ± ± ± 5%
[2]
1.27 1.94
1.0 1.56
1.1 4.8
– 5.12
1.1 0.25
1.18 1.69
1.27 1.94
1.93 2.89
1.0 1.56
0.99 1.9
1.5 1.8
2.1 2.1
1.0 1.95
1.1 2.2
1.7 2.85