HA13614 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HA13614

Combo (Spindle & VCM) Driver

Hitachi -> Renesas Electronics 

HA13614FH

Commutation Timing of the Spindle motor

U

V

W

B-EMF

CT

PHASE

(EXTCOM=0)

*1

PHASE

(EXTCOM=1)

OUTPUT

PWM

B-EMF

PWM

PWM

Vpss

Vpss/2

GND

tspndly

*2

*3

IU

0

tsrctl

commutation

time

Note: 1. In the case of external commutation mode (EXTCOM=1), the signal PHASE will toggle at every B-

EMF zero-crossing, and selected the internal commutation mode (EXTCOM=0), the PHASE will

have the same period as B-EMF of the spindle motor.

2. This is delay time by pre-LPF of the B-EMF amplifier. This delay time can be adjust by the value

of external filter capacitor C101, C102. To get the maximum driving efficiency of the spindle

motor, these capacitor value should be chosen as equation (17) in the “External components”

section.

3. The slew rate of every commutation timing is controllable by changing the SRCTL1, SRCTL2 and

SRCTL3 in the serial port.

Figure 9 Commutation Timing of the Spindle motor

14

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