Physical/Electrical Specifications; Ac Power Requirements; Dc Power Requirements - Seagate ST318203LW Product Manual

Cheetah 18LP Product Manual, Rev. F
6.0

Physical/electrical specifications

This section provides information relating to the physical and electrical characteristics of the Cheetah 18LP
drive.
6.1

AC power requirements

None.
6.2

DC power requirements

The voltage and current requirements for a single drive are shown in the following table. Values indicated apply
at the drive power connector. The table shows current values in Amperes.
Table 2: DC power requirements
Voltage
Regulation
Average idle current DCX
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
Peak operating current
DCX
Maximum DC
Maximum (peak) DC
Voltage
Regulation
Average idle current DCX
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
Peak operating current
DCX
Maximum DC
Maximum (peak) DC
[1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks
will exceed these values. Power supply at nominal voltage. N = 6, 22 Degrees C ambient.
[2] For +12 V, a –10% tolerance is permissible during initial start of spindle, and must return to ±5% before
10,000 rpm is reached. 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 +12 V current profile in Figure 3.
[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 6.2.1 "Conducted Noise Immunity." Specified voltage tolerance is inclusive of ripple, noise,
and transient response.
ST318203
Notes
SE mode
+5 V +12 V +5 V
[5] ±5% ±5%[2] ±5%
[1][7] 0.69 0.6 0.71
[3] 0.79 1.53 0.81
[3] 1.0 2.4 1.03
[1][4] 0.61 0.02 0.62
[1][6] 0.76 1.03 0.82
[1] 0.79 1.13 0.84
1.05 2.66 1.27
ST318233
SE mode
+5 V +12 V +5 V
[5] ±5% ±5%[2] ±5%
[1][7] 0.8 0.65 0.88
[3] 0.82 1.61 0.90
[3] 1.1 3.1 1.13
[1][4] 0.67 0.04 0.76
[1][6] 0.82 1.09 0.92
[1] 0.83 1.13 0.93
0.91 2.4 1.18
LVD mode SE mode
+12 V +5 V +12 V
±5% [2] ±5% ±5% [2] ±5%
0.6 0.71 0.34
1.53 0.81 1.4
2.4 0.94 2.2
0.02 0.62 0.02
1.03 0.79 0.81
1.13 0.80 0.84
2.66 1.06 2.2
LVD mode SE mode
+12 V +5 V +12 V
±5% [2] ±5% ±5% [2] ±5%
0.65 0.8 0.45
1.61 0.81 1.71
3.1 1.1 3.1
0.04 0.67 0.04
1.09 0.82 0.88
1.13 0.83 0.98
2.4 0.95 2.24
19
ST39103
LVD mode
+5 V +12 V
±5% [2]
0.72 0.34
0.82 1.4
0.95 2.2
0.65 0.02
0.84 0.81
0.85 0.84
1.27 2.2
ST39133
LVD mode
+5 V +12 V
±5% [2]
0.88 0.45
0.89 1.71
1.12 3.1
0.76 0.04
0.92 0.88
0.93 0.98
1.19 2.24