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PDF BA6832FS Data sheet ( Hoja de datos )
| Número de pieza | BA6832FS | |
| Descripción | Voice coil motor driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Motor driver ICs
Voice coil motor driver
BA6832FS
The BA6832FS is a voice coil motor driver used for moving the heads of hard disc and mass-storage floppy disc drives.
FApplications
HDD disc and mass-storage FDD
FFeatures
1) Output current is controlled by the Vctl-Vref voltage.
2) Retraction control pin.
3) Chip enabling pin.
4) Internal thermal shutdown circuit.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions
509
1 page  
Motor driver ICs
FCircuit operation
(1) Output current control
The method of output current control depends on wheth-
er the RTL pin is HIGH or LOW.
(1) When the RTL pin is LOW
The voltage VRS that develops across the resistor RS be-
tween pins 10 and 11 (with reference to pin 10) is con-
trolled by the voltage between Vctl (pin 18) and Vref (pin
19) :
VRS=(Vctl*Vref) 1 (Typ.)
The output current IO is given by :
IO=(Vctl*Vref) / Rs (Typ.)
where the positive direction is from pin 13 to pin 10.
Therefore, the voltage-current conversion gain for the
control input is determined by the RS value. The gain
band width in this case is 80kHz (typical).
(2) When the RTL pin is HIGH
The VRS voltage (with reference to pin 10) is controlled by
the Vrtr (pin 17) voltage (with reference to the ground) :
VRS=*0.1 Vrtr / Rs
(3) RTR threshold
The RTR pin threshold voltage is 1.2X1.3V. The pin has
a hysteresis width of about 40mV.
(2) Standby mode
The standby mode is activated when the CE pin is LOW;
the circuit current is reduced to 0.15mA (typical), and the
output pins are put to the high impedance state. The op-
eration mode is activated when the CE pin is HIGH, and
the output current becomes controllable. The pin’s
threshold voltage is 1.2X1.3V.
(3) Internal reference voltage
The internal reference voltage Vreg is given by :
Vreg=(VCC*VF) / 2
where Vreg=5.65 when VCC=12V. The output pins (pins 10
and 13) operate with reference to Vreg.
BA6832FS
513
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BA6832FS.PDF ] | |
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