BA6486FS 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA6486FS

FDD spindle motor driver

ROHM Semiconductor 

Motor driver ICs

FOperation notes

(1) Thermal shutdown circuit

This circuit shuts down all 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).

(2) Hall elements connection

Hall elements can be connected in either series or paral-

lel. When connecting in series, care must be taken not to

allow the Hall output to exceed the Hall common-mode

input range.

(3) Hall input level

Switching noise may occur if the Hall input voltage (pins

17X22) is too high. Differential inputs of about 100m Vp-p

are recommended.

FInput / output circuits

(1) Index input (1, 2 pin)

BA6486FS

(4) Driver ground pin (14 pin)

Pin 14, which is the motor current ground pin, is not con-

nected to the signal ground pin (26 pin). Design a proper

conductor pattern in consideration of the motor current

that flows through pin 14.

(5) External clock

Make sure that the pin 7 voltage is always less than VCC

and more than the ground voltage.

(2) FG amplifier (3X5 pin)

(3) Speed control (6 pin)

(4) External clock input (7 pin)

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