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 Optical disc ICs 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