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PDF BA6486 Data sheet ( Hoja de datos )

Número de pieza BA6486
Descripción FDD spindle motor driver
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BA6486 Hoja de datos, Descripción, Manual

Motor driver ICs
FDD spindle motor driver
BA6486FS
The BA6486FS is a one-chip IC designed for driving 12V FDD spindle motors. This high-performance IC employs a
3-phase, full-wave soft switching drive system, and contains a digital servo, an index amplifier, and a power save circuit.
The compactly packaged IC reduces the number of external components required.
FApplications
Floppy disk drivers
FFeatures
1) 12V supply voltage.
2) 3-phase, full-wave soft switching drive system.
3) Digital servo circuit.
4) Power save circuit.
5) Hall power supply switch.
6) Motor speed changeable.
7) Index amplifier.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
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BA6486 pdf
Motor driver ICs
BA6486FS
For noise filtering, a high-pass filter is given by C3 and a
resistor of 1.6k(typical), and a low-pass filter is given
by C4 and a resistor of 200k(typical). The cutoff fre-
quencies of high-pass and low-pass filters (fH and fL, re-
spectively) are given by:
fH= 1 fL= 1
2π 1.6kC3
2π 200kC4
The C3 and C4 capacitances should be set so as to satis-
fy the following relationship:
fHtfFGtfL
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.
N=60 S
fosc
S
1
(1)
nz
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).
548

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BA6486 arduino
Motor driver ICs
FElectrical characteristic curves
BA6486FS
FExternal dimensions (Units: mm)
554

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PDF Descargar[ Datasheet BA6486.PDF ]




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Número de piezaDescripciónFabricantes
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