16 | ST43401N/ND, ST43402ND User’s Manual, Rev. B | ||||
continued from previous page |
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| Without Internal | With Internal | ||
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| Terminator | Terminator | ||
Maximum Current Limits | +5V5,7 | +12V5,7 | +5V5,7 | +12V5,7 | |
Regulation ± 5%3,4,8,9 |
| Amps | Amps | ||
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SCSI |
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Maximum operating current1,2,6 | 1.9 | 1.8 | 2.3 | 1.8 | |
Average idle current1 |
| 1.8 | 1.8 | 1.9 | 1.8 |
Maximum starting current1,2 | 1.9 | 4.5 | 2.3 | 4.5 | |
Maximum seek current2 | 1.9 | 3.2 | 1.9 | 3.2 | |
SCSI differential interface (ST43401ND) |
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Maximum operating current1,2,6 | 1.9 | 1.8 |
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Average idle current1 |
| 1.8 | 1.8 |
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Maximum starting current1,2 | 1.9 | 4.5 |
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Maximum seek current9 | 1.9 | 3.2 |
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SCSI |
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Maximum operating current1,2,6 | 2.3 | 1.8 |
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Average idle current1 |
| 1.9 | 1.8 |
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Maximum starting current1,2 | 2.3 | 4.5 |
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Maximum seek current2 | 2.2 | 1.8 |
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1Measured with an average reading DC ammeter.
2Instantaneous +12V current peaks will exceed these values by up to 0.8A. The +12V average current during a 15 ms portion of the actuator signal does not exceed 4.0A.
3A ±10% tolerance on +12V is permissible during
4Inclusive of ripple, noise, transient response (except for +12V), load variation, and environ- mental conditions. An overvoltage of the +5V (greater than 6V) must cause the power supply to interrupt all DC voltages. Transient response assumes +12V changing from 1.0A to 7.2A within 200 microsecs and all other voltages at a steady state.Transient response frequencies above 30 kHz are now allowed.
5The +12V ground return must be isolated from the +5V ground return in the power supply. The +5V and +12V ground are shorted together in the drive. Where multiple units are powered on simultaneously, the peak starting current must be available to each drive.
6The drive requires overcurrent protection on all voltages. An overcurrent on the +12V must cause the power supply to interrupt all DC voltages. Overcurrent on the +5V must reduce the output current to zero and interrupt all DC voltages.
7All voltages must meet specifications within 100 msecs after the first voltage reaches 10% of its specified value.
8Transient response frequencies above 30 kHz are not allowed.
9Transient response assumes +12V changing from 1.0A to 7.2A within 200 microsecs and all other voltages at a steady state.