Dc Power Requirements; Input Noise Ripple; Input Noise Frequency; Figure 1: Typical +12 Volt Dc Start-Up Current Profile - Seagate ST212 Product Manual

OC POWER REQUIREMENTS
1.6
The ST212 is listed in accordance with UL 478 and CSA C22.2 (0-MI982), and
meets aIl applicable sections of IEC 380 and VDE 0806/08.81, as tested by TUV-
Rheinland, North America.
Power may be applied or removed in any sequence without loss of data or damage
to the drive.
+12 VDC
Voltage Tolerance (inc. ripple):
Maximum Current at Power-on:
± 5070 Both seek and non-
seek conditions
3.2 Amp
1.0 Amp typical
+5 VDC:
Voltage Tolerance (inc. ripple):
Maximum Current at Power-on:
POWER:
±
5070 Both seek and non-
seek conditions
1.2 Amp
1.0 Amp typical
17 Watts typical
INPUT NOISE RIPPLE 1.&.1
The maximum permitted ripple is 50 mV (peak-to-peak) on either + 12 Volts
or +5 Volts.
INPUT NOISE FREQUENCY
20 MHz max. on both the + 12 VDC and + 5 VDC Hnes.
1.&.2
AMPS
r------~-----...,...-----~
15 10
5
4.0
t - - - - - - - - - + - - - - - - 4 - - - - - - - I
3.5
3.2~---llIo....­
3.0
2.5
2.0
t---------+------4-~-----I
.5
0.0 ..... ---"' .......
~
o
1.5
1.0
FIGURE 1:
Typical
+12Volt OC
Start-up Current
Profile
SECONDS
ST212 PRODUCT MANUAL/Rev. B
3