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). FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 624 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. Optical disc ICs BA5941FP Block diagram Pin descriptions 625 Optical disc ICs Input / output circuits 626 BA5941FP Optical disc ICs BA5941FP FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, BIAS = 2.5V, RL = 8Ω) 627 Optical disc ICs Measurement circuits 〈Driver block〉 〈Operational amplifier block〉 628 BA5941FP Optical disc ICs BA5941FP Application example 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. FElectrical characteristic curves 630 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. 0.1µF) 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. Optical disc ICs BA5941FP External dimensions (Units: mm) 631