HA13566AF Datasheet, PDF (7/20 Pages) Hitachi Semiconductor – Combo (Spindle & VCM) Driver

Commutation Timing
Commutation for starting up
COMM
PHASE
1/f_COMM
Delay
HA13566AF
Pulsewidth ≥ 10µs
+
I_{U 0}
–
+
I_{V 0}
–
+
I_{W 0}
–
Synchronous
(≅0.2s to 0.3s)
driving by B-EMF sensing
Note: 1. The frequency of COMM signal f_COMM can be designed as follows.
f_{COMM (max)} = 2.5
P · K_T · I_{O (Hz)}
J
(for begin of synchronous driving)
(1)
f_{COMM (min)} = 0.5
P · K_T · I_{O (Hz)}
J
(for end of synchronous driving)
(2)
Where,
P : Pole number of spindle motor (Hz)
K_T : Torque constant (kg · cm/A)
I_O : Start up current (A)
J : Moment of inertia (kg · cm · S²)
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