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BA6492BFS Datasheet(PDF) 8 Page - Rohm

No. de Pieza. BA6492BFS
Descripción  FDD spindle motor driver
Descarga  13 Pages
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Fabricante  ROHM [Rohm]
Página de inicio  http://www.rohm.com
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BA6492BFS Datasheet(HTML) 8 Page - Rohm

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562
Motor driver ICs
BA6492BFS
(3)
Index signal circuit
The index signal circuit receives and amplifies differential
inputs of Hall device signals. The Hall inputs have a hys-
teresis. The monostable multivibrator devices create a
delay time from the zero-cross point, and outputs a pulse
after the delay time. The delay time and the pulse width
can be set arbitrarily with the time constant of the external
CR. The following equations are given for the delay times
T1, T2, and T3 for the speed control pin voltage levels of
LOW, HIGH, and MEDIUM, respectively:
T1 1.35
C5
VR [sec]
(Typ.)
T2 1.13
C5
VR [sec]
(Typ.)
T3 0.68
C5
VR [sec]
(Typ.)
T4 2.14
105
C4 [sec]
(Typ.)
T1 / T2 = 1.2
(Typ.)
T1 / T3 = 2.0
(Typ.)
The delay angle remains constant regardless of changes
in the motor speed.
(4)
Other circuits
The start / stop circuit puts the IC to the operational 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 elements bias switch, which is linked to the
start / stop circuit, is turned off during the standby state,
so that the Hall elements current is shut down.
The thermal shutdown circuit shuts down the IC currents
when the chip junction temperature is increased to about
175
_C (typical). The thermal shutdown circuit is deacti-
vated when the temperature drops to about 20
_C (typi-
cal).


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