Data Sheet
4-CHANNEL MOTOR DRIVER FOR DVD PLAYER
AM5954A
Application Information
Supplement: (Current-feedback driver)
1. This IC has a built-in thermal shutdown circuit
that mutes the output current when the chip tem-
o
The transmission gain (output current/input
voltage) is given by:
perature reachs 178 C (Typ). The hysteresis is set
o
to 25 C (Typ), so the driver circuits start up again
o
when the chip temperature falls to 153 C (Typ).
gm=1/(R + R
) (A/V)
D
WIRE
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.
R
is the total gold wire resistance inside the
WIRE
package (0.15Ω ± 0.05Ω ) (Typ).
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 V -pin and GND-pin as near as
CC
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.
Mar. 2007 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
11
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
