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AM5954A

4-CHANNEL MOTOR DRIVER FOR DVD PLAYER

BCD Semiconductor 

Data Sheet

4-CHANNEL MOTOR DRIVER FOR DVD PLAYER

Application Information

AM5954A

1. This IC has a built-in thermal shutdown circuit

that mutes the output current when the chip tem-

perature reachs 178oC (Typ). The hysteresis is set

to 25oC (Typ), so the driver circuits start up again

when the chip temperature falls to 153oC (Typ).

2. The driver buffer is switched off when the supply

voltage falls below 3.5V (Typ), and is switched

back on when the voltage reaches 3.7V (Typ)

again.

3. In case standby pin voltage is under 0.5V or

opened, quiescent current is muted. Standby pin

voltage should be over 2.0V for normal applica-

tion.

4. BIAS pin (pin 27) should be pulled up more than

1.2V. In case bias pin voltage is pulled down

under 0.9V (Typ), output current is muted.

5. Insert the by-pass capacitor (approximately

0.1µF) between VCC-pin and GND-pin as near as

possible to this IC.

6. Heat dissipation fins are attached to the GND

inside the package. Make sure to connect them to

the external GND.

Supplement: (Current-feedback driver)

The transmission gain (output current/input

voltage) is given by:

gm=1/(RD + RWIRE) (A/V)

RWIRE is the total gold wire resistance inside the

package (0.15Ω ± 0.05Ω ) (Typ).

Mar. 2007 Rev. 1. 4

BCD Semiconductor Manufacturing Limited

11

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