Seagate Cheetah 18LP, Product Manual, Page: 31 / 94

Cheetah 18LP Product Manual, Rev. F 21
Figure 3. Typical ST318203 and ST318233 drive +12 V current profile
Figure 4. Typical ST39103 and ST39133 drive +12 V current profile
0.0 2 4 6 8 10 12 14 16
0.0
0.5
1.0
1.5
2.0
2.5
A
Seconds
T0 T1 T3 T4
AC Envelope
T2
+12 Volt Current during spindle start – Typical Amperes
DC (average) of waveform
0.0 2 4 6 8 10 12 14 16
0
0.5
1.0
1.5
2.0
2.5
A
Seconds
T0 T1 T3 T4
Peak AC Envelope
T2
Peak DC
+12 Volt Current during spindle start – Typical Amperes