Seagate ST19101N/W/WC/WD/DC manual DC power requirements Amps ST19101 WC models WD, DC models

18	Cheetah 9 Installation Guide, Rev. B
Table 2. DC power requirements (Amps)
	ST19101
	N, W, WC models		WD, DC models
	+5V8, 10	+12V8	+5V8	+12V8
Voltage regulation5	± 5%	± 5%2	± 5%	± 5%2
Max. start current
Peak DC 3, 6, 9	0.93	3.22	0.99	3.22
Delayed motor start
(max)1, 4	0.79	0.12	0.83	0.12
Peak operating current
Typical DC 1	0.89	1.48	1.1	1.48
Maximum (peak)7	1.03	2.7	—	2.7

1Measured with an average reading DC ammeter. Instanta- neous +12V current peaks will exceed these values.

2A –10% tolerance is permissible during initial start of the spin- dle but must return to ±5% before reaching 10,000 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.

3See the +12V current profile in the Cheetah 9 Product Manual (publication number 83329170).

4This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start Motor command.

5See “Conducted noise immunity” in the Cheetah 9 Product Manual. The specified voltage tolerance is inclusive of ripple, noise, and transient response.