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BA6486FS 데이터시트(PDF) 5 Page - Rohm

부품명 BA6486FS
상세설명  FDD spindle motor driver
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
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BA6486FS 데이터시트(HTML) 5 Page - Rohm

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548
Motor driver ICs
BA6486FS
For noise filtering, a high-pass filter is given by C3 and a
resistor of 1.6k
Ω (typical), and a low-pass filter is given
by C4 and a resistor of 200k
Ω (typical). The cutoff fre-
quencies of high-pass and low-pass filters (fH and fL, re-
spectively) are given by:
The C3 and C4 capacitances should be set so as to satis-
fy the following relationship:
fH
tfFGtfL
where fFG is the FG frequency. Note that the FG amplifier
inputs have a hysteresis.
The speed discriminator divides the reference clock and
compares with the reference frequency, and then outputs
an error pulse according to the frequency difference. The
motor rotational speed N is given in the following formula.
fosc is the reference clock frequency,
n is (speed discriminator count)
2,
z is the FG tooth number.
The discriminator count depends on the speed control
pin voltage.
The integrator flattens out the error pulse of the speed
discriminator and creates a control signal for the motor
drive circuit (Fig. 15).
(3)
Index amplifier
The index amplifier is a hysteresis amplifier with a typical
hysteresis width of +18mV and –22mV. The input pin is
not biased internally.
(4)
Other circuits
S Start/stop circuit
The start / stop circuit puts the IC to the operating state
when the control pin is LOW, and to the standby state (cir-
cuit current is nearly zero) when the control pin is HIGH.
The Hall device bias switch, which is linked to the
start / stop circuit, is turned off during the standby state,
so that the Hall device current is shut down.
S Thermal shutdown circuit
This circuit shuts down the IC currents when the chip
junction temperature is increased to about 175
_C (typi-
cal). The thermal shutdown circuit is deactivated when
the temperature drops to about 155
_C (typical).
fH=
1
2
π
1.6k
C3
fL=
1
2
π
200k
C4
(1)
N=60 S
fosc
n
S
1
z


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