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26 Cheetah 15K.4 FC Product Manual, Rev. B
[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
14,904 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 2.
[4] This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start
Motor command.
[5] See paragraph 6.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and
transient response.
[6] Operating condition is defined as random 8 block reads at 225 I/Os per second for ST3146954FC models
Table 3: DC power requirements for ST373554FC drives
Notes
1 Gbit mode 2 Gbit mode 4 Gbit mode
(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] 0.62 0.57 0.66 0.56 0.69 0.57
Maximum starting current
(peak DC) DC 3σ [3] 0.83 1.88 0.94 1.85 0.77 1.71
(peak AC) AC 3σ [3] 0.98 4.08 1.11 4.08 1.17 2.94
Delayed motor start (max) DC 3σ [1] [4] 0.54 0.03 0.58 0.04 0.70 0.04
Peak operating current:
Typical DCX [1] [6] 0.79 1.01 0.90 0.66 0.76 0.79
Maximum DC 3σ [1] 0.82 1.03 1.18 0.67 0.77 0.80
Maximum (peak) DC 3σ 1.27 2.82 1.24 2.98 1.30 2.82
Table 4: DC power requirements for ST336854FC drives
Notes
1 Gbit mode 2 Gbit mode 4 Gbit mode
(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] 0.62 0.43 0.66 0.43 0.69 0.43
Maximum starting current
(peak DC) DC 3σ [3] 0.83 1.59 0.93 1.58 0.98 1.59
(peak AC) AC 3σ [3] 0.99 3.43 1.11 3.30 1.16 3.36
Delayed motor start (max) DC 3σ [1] [4] 0.55 0.03 0.58 0.03 0.62 0.03
Peak operating current:
Typical DCX [1] [6] 0.77 0.87 0.81 0.86 0.84 0.87
Maximum DC 3σ [1] 0.81 0.89 0.85 0.88 0.88 0.88
Maximum (peak) DC 3σ 1.26 2.64 1.31 2.54 1.35 2.59