Seagate ST34573N/W/WD/LW/WC/LC DC power requirements Amps, multimode, ST39173LW/LC ST34573LW/LC

Barracuda 9LP Installation Guide, Rev. E						19
Table 2c. DC power requirements (Amps), multimode
	(SE/LVD)
			ST39173LW/LC		ST34573LW/LC
Voltage			+5V	+12V	+5V	+12V
Regulation [5]			±5%	±5%[2]	±5%	±5%[2]
Max. operating current
DC [1]			1.4	0.95	1.4	0.95
Avg. idle current
	[1]		0.75	0.5	0.75	0.5
DCX
Max. starting current
(peak DC) [3]			1.2	1.7	1.2	1.7
(peak AC) [3]			—	2.9	—	2.9
Delayed motor
start (max) [1][4]			0.65	0.06	0.65	0.06
Peak operating current
		[1][6]	1.2	0.9	1.2	0.9
Typical DCX
Maximum DC [1]			1.4	0.95	1.4	0.95
Maximum (peak)			1.7	2.4	1.7	2.4

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

[2]A –10% droop is permissible during initial start of the spindle but must return to ±5% before reaching 7,200 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 the +12V current profile in the Barracuda 9LP Product Manual (publication number 77767517).

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