Hitachi HUS157336EL3600 - Manual (Page 15)

Drawing No. Sheet No. Revision 5
K6602906 15/46 2003/6/12
4 DC power Interface
4.1 DC Power Requirement
The drives are operated on DC power (+5V, +12V) only.
No power sequencing is required.
The +5 and +12 Volts can be applied in any order.
Table 4.1 DC Power Requirement
Power supply Voltage tolerance Allowed ripple and noise
+5V DC 5.0V +/-5% Less than 150mVp-p (0 - 100kHz)
Less than 100mVp-p (100kHz - 10MHz)
+12V DC 12.0V +/-5% Less than 150mVp-p (0 - 100kHz)
Less than 100mVp-p (100kHz - 10MHz)
Note 1. Voltage tolerance is measured at the DC power connector on the PCB.
The ripple current occurs during the motor start-up and seek.
Appropriate size of the DC Power cable is recommended to reduce the above
ripple and noise.
Note 2. In case of fluctuations in the DC power (spikes, momentary shut off, etc.), the
data being recorded or to be recorded from buffer memory are not assured.