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Cheetah 15K.6 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.
[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.
[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
Table 6: ST3146356FC DC power requirements
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] 0.53 0.53 0.56 0.53 0.63 0.53
Maximum starting current
(peak DC) DC 3σ [3] 0.82 1.75 0.68 1.75 0.74 1.75
(peak AC) AC 3σ [3] 1.11 3.42 0.95 3.81 1.00 3.58
Delayed motor start (max) DC 3σ [1] [4] 0.62 0.04 0.64 0.04 0.71 0.04
Peak operating current:
Typical DCX [1] [6] 0.62 0.96 0.65 0.96 0.72 0.95
Maximum DC 3σ [1] 0.64 0.96 0.65 0.98 0.73 0.97
Maximum (peak) DC 3σ 1.12 2.34 1.16 2.32 1.22 2.34
Table 7: ST3146756FC DC power requirements
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] 0.52 0.54 0.55 0.53 0.60 0.53
Maximum starting current
(peak DC) DC 3σ [3] 0.60 1.77 0.63 1.77 0.94 1.77
(peak AC) AC 3σ [3] 0.99 3.72 0.90 3.81 1.25 3.93
Delayed motor start (max) DC 3σ [1] [4] 0.56 0.04 0.60 0.04 0.65 0.04
Peak operating current:
Typical DCX [1] [6] 0.50 0.95 0.56 0.95 0.62 0.95
Maximum DC 3σ [1] 0.53 0.97 0.57 0.96 0.62 0.97
Maximum (peak) DC 3σ 1.18 2.36 1.24 2.34 1.32 2.34