Rohm BA5915FP 4-channel btl driver for cd player Datasheet

Optical disc ICs
4-channel BTL driver for CD players
BA5915FP
The BA5915FP contains a 4-channel BTL driver for CD player motors and actuators and a multi-purpose operational
amplifier. Perfect for compact applications with the use of the HSOP 28-pin package.
FApplications
CD players, CD-ROM
FFeatures
1) 4-channel BTL driver.
2) Wide dynamic range (3.55V (Typ.) when VCC = 5V
and RL = 8Ω).
3) Internal thermal shutdown circuit.
4) Gain is adjustable with externally connected resistor.
5) Internal multi-purpose operational amplifier.
6) External mute pin enables the muting of the output
current for channel 1.
7) Perfect for compact applications with the use of the
HSOP 28-pin power package.
FAbsolute maximum ratings (Ta = 25 _C)
FRecommended operating conditions (Ta = 25 _C)
597
Optical disc ICs
Block diagram
Pin descriptions
598
BA5915FP
Optical disc ICs
BA5915FP
Input / output circuits
599
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FElectrical characteristics (unless otherwise noted, Ta = 25 _C, VCC = 5V, BIAS = 2.5V, RL = 8Ω)
600
BA5915FP
Optical disc ICs
BA5915FP
Measurement circuits
601
Optical disc ICs
Measurement circuit switch table
(1) Driver block (OPIN ! 1, NF ! 1, OPRL ! 1, VOPIN = 2.5V)
(2)
602
Operational amplifier block (RL ! OFF)
BA5915FP
Optical disc ICs
BA5915FP
Application example
603
Optical disc ICs
FOperation notes
(1) The BA5915FP contains a thermal shutdown circuit. When the chip temperature reaches 175 _C (Typ.),
the output current is muted. If the chip temperature then
drops below 150 _C (Typ.), then the mute is released.
(2) By having the mute pin (pin 7) voltage pulled up to
2.2V or greater, you can mute the output current for channel 1 (between pins 1 and 2). For normal conditions, have
pin 7 open or at 0.4V or below.
(3) If the voltage of the bias pin (pin 23) drops below
1.4V (Typ.), outputs are muted. For normal conditions,
have the voltage above 1.7V.
(4) If the power supply voltage drops below 3.8V (Typ.),
internal circuits turn off. If the power supply voltage then
FElectrical characteristic curves
604
BA5915FP
rises to 4.0V (Typ.), the circuits turn on.
(5) If the voltage of the thermal shutdown, mute ON, or
bias pin drops, or if the power supply voltage drops, the
mute is activated; however, in these situations, only the
drivers are muted. Also, the output pin voltage becomes
the internal bias voltage (approx. VCC - VF / 2).
(6) Connect a bypass capacitor (approx. 0.1µF) between the bases of the power supply pins of this IC.
(7) Even though the radiation fins are connected to
ground within the package, be sure to also connect them
to a ground externally as well.
Optical disc ICs
BA5915FP
External dimensions (Units: mm)
605
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