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| Optical disc ICs 5-channel BTL driver for CD players BA6995FP The BA6995FP is 5-channel BTL driver for CD and MD player actuators and spindle, thread and loading motors. The spindle driver and loading driver share a single buffer, and either can be driven via the control pin. FApplications CD, MD players and other optical disc applications FFeatures 1) 28-pin HSOP package allows for miniaturization of applications. 2) Gain is adjustable with a single attached resistor. FAbsolute maximum ratings (Ta = 25_C) 3) Wide dynamic range (5 or 4V when VCC=8V) 4) Adaptable for low-voltage servos. FRecommended operating conditions (Ta = 25_C) 494 Optical disc ICs FBlock diagram BA6995FP 495 Optical disc ICs FPin descriptions BA6995FP 496 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, RL = 8) BA6995FP 497 Optical disc ICs FMeasurement circuit BA6995FP 498 Optical disc ICs FFunction description CTL1 and CTL2 BA6995FP Forward and reverse (enabled only when channel 5 control and channel 5 are ON) FApplication example 499 Optical disc ICs FOperation notes (1) Tray motor driver voltage setting (forward mode) BA6995FP Note: Tray driver output voltage cannot be set higher than the maximum output voltage for the power supply. The example above applies only when setting below the maximum output voltage. Maximum output voltage for the power supply can be output by pulling up the tray input pin (pin 8), or by connecting it to VCC. (2) Muting Thermal shutdown The output current is muted when the chip temperature exceeds 175_C (typically). Supply voltage drop muting The internal circuits turn off when the supply voltage drops below 4.3V (typically), and turn on again when it rises above 4.5V (typically). (3) Muting occurs during thermal shutdown and when the supply voltage drops. In either case, only the driver is muted. The output pin voltage during muting is the internal bias voltage, roughly VCC / 2. (4) Be sure to connect the IC to a 0.1F bypass capacitor to the power supply, at the base of the IC. (5) Connect the radiating fin to an external ground. FElectrical characteristic curves 500 Optical disc ICs BA6995FP FExternal dimensions (Units: mm) 501 |
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