502
Optical disc ICs
5-channel BTL driver for CD and
MD Players
BA6996FP
The BA6996FP, an IC designed for CD and MD players, has a 5-channel BTL power driver and a standard operational
amplifier. The spindle and tray driver share a single output buffer, and are specified with a control pin. In addition, the
internal level shift circuit reduces the number of attached components.
F
Applications
CD players, CD-ROM drives, MD players and other optical disc devices
F
Features
1) A 5-channel BTL driver in a HSOP 28-pin package,
allowing for application miniaturization.
2) Five drivers are turned on and off according to the
combination of control pin logic.
3) The tray driver operates even when the servo power
supply drops.
4) Internal thermal shutdown circuit.
5) Gain is adjustable with an attached resistor.
6) Internal standard operational amplifier.
7) Supports low-voltage servos.
F
Absolute maximum ratings (Ta = 25
_
C)
F
Recommended operating conditions (Ta = 25
_
C)
509
Optical disc ICs
BA6996FP
F
Operation notes
(1)
Setting the tray motor driver voltage (forward mode)
(2)
Mute functions
%
Thermal shutdown
&
The output current is muted when the chip temperature
exceeds 175
_
C (typically).
%
Supply voltage drop muting
&
The internal circuits turn off when the supply voltage
drops below 4.3V (typically), and turn on again when it
rises above 4.5V (typically).
(3)
Muting occurs during thermal shutdown and when
the supply voltage or bias pin voltage drops. In each
case, only the driver is muted. The output pin voltage dur-
ing muting is the internal bias voltage, roughly V
CC
VF / 2.
(4)
Be sure to connect the IC to a 0.1
F bypass capaci-
tor to the power supply, at the base of the IC.
(5)
Connect the radiating fin to an external ground.
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