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HA13556AF Datasheet, PDF (7/20 Pages) Hitachi Semiconductor – Combination of Spindle and VCM Driver designed for HDD and have Following Functions and Features | |||
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Commutation Timing
Commutation for starting up
COMM
PHASE
1/fCOMM
Delay
HA13566AF
Pulsewidth ⥠10µs
+
IU 0
â
+
IV 0
â
+
IW 0
â
Synchronous
(â
0.2s to 0.3s)
driving by B-EMF sensing
Note: 1. The frequency of COMM signal fCOMM can be designed as follows.
fCOMM (max) = 2.5
P · KT · IO (Hz)
J
(for begin of synchronous driving)
(1)
fCOMM (min) = 0.5
P · KT · IO (Hz)
J
(for end of synchronous driving)
(2)
Where,
P : Pole number of spindle motor (Hz)
KT : Torque constant (kg · cm/A)
IO : Start up current (A)
J : Moment of inertia (kg · cm · S2)
7
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