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| 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 = 8). FAbsolute maximum ratings (Ta = 25_C) 4) 5) 6) 7) Internal thermal shutdown circuit. Gain is adjustable with externally connected resistor. Internal multi-purpose operational amplifier. External mute pin enables the muting of the output current. FRecommended operating conditions (Ta = 25_C) 624 Optical disc ICs FBlock diagram BA5941FP FPin descriptions 625 Optical disc ICs FInput / output circuits BA5941FP 626 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, BIAS = 2.5V, RL = 8) BA5941FP 627 Optical disc ICs FMeasurement circuits Driver block BA5941FP Operational amplifier block 628 Optical disc ICs FApplication example BA5941FP 629 Optical disc ICs FOperation notes (1) The BA5941FP contains a thermal shutdown circuit. When the chip temperature reaches 175_C (Typ.), the output current is muted. (2) By having the mute pin (pin 9) voltage open or lowered 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. BA5941FP (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. 0.1F) between 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 630 Optical disc ICs FExternal dimensions (Units: mm) BA5941FP 631 |
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