624
Optical disc ICs
4-channel BTL driver for CD players
BA5941FP
The BA5941FP contains a 4-channel BTL driver for CD player motors and actuators. 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) Perfect for compact applications with the use of the
HSOP 28-pin power package.
3) Wide dynamic range (4.8V (Typ.) when VCC = 8V and
RL = 8Ω).
4) Internal thermal shutdown circuit.
5) Gain is adjustable with externally connected resistor.
6) Internal multi-purpose operational amplifier.
7) External mute pin enables the muting of the output
current.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
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Optical disc ICs BA5941FP
Block diagram
Pin descriptions
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Optical disc ICs BA5941FP
Input/output circuits
627
Optical disc ICs BA5941FP
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, BIAS = 2.5V, RL = 8Ω)
628
Optical disc ICs BA5941FP
Measurement circuits
〈Driver block〉
〈Operational amplifier block〉
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Optical disc ICs BA5941FP
Application example
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Optical disc ICs BA5941FP
FOperation notes
(1) The BA5941FP contains a thermal shutdown cir-
cuit.
When the chip temperature reaches 175_C (Typ.), the
output current is muted.
(2) By having the mute pin (pin 9) voltage open or low-
ered to 0.5V or below , the output currents can be muted.
For normal conditions, have the voltage at pin 9 pull-up
to 2V.
(3) If the voltage of the bias pin (pin 2) drops below 1.4V
(Typ.), outputs are muted.
For normal conditions, have the voltage above 1.8V.
(4) If the voltage of the thermal shutdown, mute ON, or
bias pin 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).
(5) Connect a bypass capacitor (approx. 0.1µF) be-
tween the bases of the power supply pins of this IC.
(6) Even though the radiation fins are connected to
ground within the package, be sure to also connect them
to a ground externally as well.
FElectrical characteristic curves
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Optical disc ICs BA5941FP
External dimensions (Units: mm)
