Optical disc ICs
4-channel BTL driver for CD players
BA6790FP / BA6791FP
The BA6790FP and BA6791FP are 4-channel BTL drivers for CD player actuators and motors. These ICs have internal 5 V regulators and general purpose operational amplifiers, and are mounted to a 28-pin HSOP package, allowing for the miniaturization of applications.
FApplications CD players and portable CD
FFeatures 1) 4-channel BTL driver. 2) HSOP 28-pin package allows for miniaturization of applications. 3) Wide dynamic range. (typically 5.4V when VCC = 8V and RL = 8Ω)
4) Internal thermal shutdown circuit. 5) Gain is adjustable with a single attached resistor. 6) Internal 5V regulator. (requires attached PNP transistor) 7) Internal general purpose operational amplifier.
FBlock diagram
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Optical disc ICs
FPin descriptions
BA6790FP/BA6791FP
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions
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Optical disc ICs
BA6790FP/BA6791FP
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, f = 1kHz, RL = 8Ω)
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Optical disc ICs
FMeasurement circuit
BA6790FP/BA6791FP
351
Optical disc ICs
FMeasurement circuit switch table
BA6790FP/BA6791FP
FInput / output circuits
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Optical disc ICs
BA6790FP/BA6791FP
FApplication example
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Optical disc ICs
FThermal derating curve
BA6790FP/BA6791FP
FOperation notes (1) The BA6790FP and BA6791FP have an internal thermal shutdown circuit. Output current is muted when the chip temperature exceeds 175_C (typically) and restored when the chip temperature falls to 150_C (typically). (2) If the mute pin (pin 7) voltage is opened or lowered below 0.5V, the output current will be muted. Pin 7 should be pulled up above 2.0V during normal use. (3) The bias pin (pin 23) is muted when lowered below 1.4V (typically). Make sure it stays above 1.6V during normal use. (4) Muting occurs during thermal shutdown, mute-on operations or a drop in the bias pin voltage. In each case, only the drivers are muted. During muting, the output pins remain at the internal bias voltage, roughly (VCC / 2). (5) Be sure to connect the IC to a 0.1µF bypass capacitor to the power supply, at the base of the IC. (6) The radiating fin is connected to the packages internal GND, but should also be connected to an external ground. (7) The capacitor between regulator output (pin 6) and GND also serves to prevent oscillation of the IC, so select one with good temperature characteristics.
FExternal dimensions (Units: mm)
354
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