AZ5954 Datasheet, PDF (11/13 Pages) BCD Semiconductor Manufacturing Limited – 4-CHANNEL BTL MOTOR DRIVER FOR CD-ROM/DVD

Data Sheet
4-CHANNEL BTL MOTOR DRIVER FOR CD-ROM/DVD
AZ5954
Application Information
1. This IC has a built-in thermal shutdown circuit
that mutes the output current when the chip tem-
perature reached 178^oC (Typ.). The hysteresis is
set to 25^oC (Typ.), so the driver circuits start up
again when the chip temperature falls to 153^oC
(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 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 V_CC-pin and GND-pin as near as
possible to this IC.
6. Heat dissipation fins are attached to the GND on
the inside of the package. Make sure to connect
these to external GND.
Supplement: (Current-feedback driver)
The transmission gain (output current/input
voltage) is given by:
gm = 1 / (R_D + R_WIRE) (A/V)
R_WIRE is the total gold wire resistance inside the
package (0.15 Ω ± 0.05 Ω ) (Typ.).
Apr. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
11