1.7.1.1 Typical current profile
Figure 1 shows a typical current profile.
1.7.2
Conducted noise
Input noise ripple is measured at the host system power supply across
an equivalent 80-ohm resistive load on the +12 volt line or an equivalent
15-ohm resistive load on the +5 volt line.
•
Using 12-volt power, the drive is expected to operate with a maximum
of 120 mV peak-to-peak triangular-wave injected noise at up to 25
MHz.
•
Using 5-volt power, the drive is expected to operate with a maximum
of 100 mV peak-to-peak triangular-wave injected noise at up to 25
MHz.
Note. Equivalent resistance is calculated by dividing the nominal volt-
age by the typical RMS read/write current.
1.7.3
Voltage tolerance
Voltage tolerance (including noise): 5V and 12V
±
5%
1500
1000
500
0
0.5
1.0
1.5
2.0
Time (seconds)
Current (mA)
500mA/Division
2.5
3.0
3.5
4.0
4.5 5.0
Figure 1. Typical startup and operation current profile
10
Medalist 6540, 5130 and 3220 Product Manual, Rev. A
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