BA5912

Optical disc ICs 2-channel BTL driver for CD players BA5912AFP-Y The BA5912AFP-Y is a 2-channel BTL driver developed to drive CD player motors and actuators. Perfect for compact applications with the use of the HSOP 25-pin package. FApplications CD players, CD-ROM FFeatures 1) 2-channel BTL driver. 2) Perfect for compact applications with the use of the HSOP 25-pin power package. 3) Wide dynamic range. 4) External mute pin enables the muting of the output current (independent muting for channels 1 and 2). Muting both channels causes the IC to enter the standby mode. 5) Two internal multi-purpose operational amplifiers. 6) Power supply is divided into three systems (Pre VCC, Pow VCC for channel 1, and Pow VCC for channel 2) 7) Internal standard two operational amplifier. 8) Internal thermal shutdown circuit. FAbsolute maximum ratings (Ta = 25 _C) FRecommended operating conditions (Ta = 25 _C) 589 Optical disc ICs FBlock diagram BA5912AFP-Y FPin descriptions 590 Optical disc ICs FInput / output circuits BA5912AFP-Y 591 Optical disc ICs BA5912AFP-Y FElectrical characteristics (unless otherwise noted, Ta = 25 _C, Pre VCC = Pow VCC = 5V, BIAS = 2.5V, RL = 8Ω) 592 Optical disc ICs FMeasurement circuits 〈Driver block〉 BA5912AFP-Y 593 Optical disc ICs 〈Operational amplifier block〉 BA5912AFP-Y FApplication example 594 Optical disc ICs FOperation notes (1) The BA5912AFP-Y 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 voltage of the mute pins (pins 2 and 13) open or lowered to 0.5V or below, you can independently mute the output current for channels 1 and 2. For normal conditions, have the voltages for the mute pins (pins 2 and 13) pulled up to 2.0V or greater. If the both mute pins (pins 2 and 13) are open or 0.5V or less, then the IC automatically enters the standby mode. (3) If the voltage of the bias pin (pin 20) drops below 1.4V (Typ.), outputs are muted. For normal conditions, have the voltage above 2.0V. (4) If the power supply voltage drops below 3.5V (Typ.), internal circuits turn off. If the power supply voltage then rises to 4.0V (Typ.), the circuits turn on. FElectrical characteristic curves BA5912AFP-Y (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. (6) When Pre VCC = Pow VCC, have the Vref switch pin open or at 0.5V or less (internal bias voltage = (Pow VCC*VF) / 2). When Pre VCC > POW VCC)VF, have the Vref switch pin pulled up to 2.0V (internal bias voltage = Pow VCC / 2). (7) Connect a bypass capacitor (approx. 0.1µF) between the bases of the power supply pins of this IC. (8) Even though the radiation fins are connected to ground within the package, be sure to also connect them to a ground externally as well. 595 Optical disc ICs BA5912AFP-Y FExternal dimensions (Units: mm) 596