Rohm BA6996FP 5-channel btl driver for cd and md player Datasheet

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.
Applications
CD players, CD-ROM drives, MD players and other optical disc devices
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.
Absolute maximum ratings (Ta = 25C)
Recommended operating conditions (Ta = 25C)
502
4)
5)
6)
7)
Internal thermal shutdown circuit.
Gain is adjustable with an attached resistor.
Internal standard operational amplifier.
Supports low-voltage servos.
Optical disc ICs
BA6996FP
Block diagram
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Optical disc ICs
Pin descriptions
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BA6996FP
Optical disc ICs
BA6996FP
Input / output circuits
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Optical disc ICs
Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 8V, f = 1kHz, RL = 8Ω)
506
BA6996FP
Optical disc ICs
BA6996FP
Measurement circuit
507
Optical disc ICs
Application example
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BA6996FP
Optical disc ICs
BA6996FP
Operation notes
(1) Setting the tray motor driver voltage (forward mode)
(2)
Mute functions
(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 during muting is the internal bias voltage, roughly VCC–VF / 2.
(4) Be sure to connect the IC to a 0.1µF bypass capacitor to the power supply, at the base of the IC.
(5) Connect the radiating fin to an external ground.
Thermal shutdown
The output current is muted when the chip temperature
exceeds 175C (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).
509
Optical disc ICs
Electrical characteristic curves
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BA6996FP
Optical disc ICs
BA6996FP
External dimensions (Units: mm)
511
Optical disc ICs
MEMO
512
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