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| Optical disc ICs 5-channel BTL driver for CD players BA6395AFP The BA6395AFP is a 5-channel BTL driver for CD player motors and actuators. This IC has an internal 5V regulator, and is suited to a wide range of applications. FApplications CD players and CD-ROM drives FFeatures 1) Internal drivers for focus coils, tracking coils, spindle motors, feed motors and loading. (The loading and spindle motor output pins are dual-use output pins and are switched between drivers using a control input.) 2) HSOP 28-pin package allows for miniaturization of applications. 3) Low number of external components. 4) Driver gain is adjustable with a single attached resistor. 5) Internal 5V regulator. (requires attached PNP transistor) 6) Internal thermal shutdown circuit. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 462 Optical disc ICs BA6395AFP FBlock diagram 463 Optical disc ICs FPin descriptions BA6395AFP 464 Optical disc ICs FInput / output circuits BA6395AFP 465 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, f = 1kHz, RL = 8) BA6395AFP 466 Optical disc ICs FCircuit operation (1) Driver Inputs to the IC are the focus tracking error signal from the servo preamplifier and the control signal from the motor. The input signals, which normally center on 2.5V, are V / I converted by the preamplifier, generating a current corresponding to the input voltage. This current is BA6395AFP passed through a resistor and into the internal reference voltage component, the preamplifier output being a signal centering on the internal reference voltage. Two systems (positive phase and negative phase) are created during V / I conversion, generating BTL output via the driver buffer. (2) Regulator This is a typical series regulator that generates a reference voltage internally. A PNP low saturation transistor must be connected. (3) Operational amplifier A standard 4558 type. 467 Optical disc ICs BA6395AFP 4. Channel 2 / loading motor driver output mode switching (VCC = 8V) 468 Optical disc ICs (5) Loading motor driver voltage setting Example : Forward motor BA6395AFP Loading 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 volt- age for the power supply can be output by opening the loading pin (pin 19). FApplication example 469 Optical disc ICs FOperation notes (1) The BA6795AFP has an internal thermal shutdown circuit. Output current is muted when the chip temperature exceeds 175_C (typically). (2) If the mute pin (pin 7) voltage is opened or lowered below 0.5V, the output current will be muted. Pin 7 should be pulled up above 2.0V during normal use. (3) The bias pin (pin 23) is muted when lowered below 1.4V (typically). make sure it stays above 1.6V during normal use. (4) The driver circuit shuts down when the supply voltage drops below 4.3V (typically), and starts up again when the voltage rises above 4.5V (typically). (5) Muting occurs during thermal shutdown, mute-on operations or a drop in the bias pin voltage or supply voltage. In each case, only the drivers are muted. During muting, the output pins remain at the internal bias voltage, roughly (VCC-VF) / 2. FThermal derating curves BA6395AFP (6) The internal input resistor has a positive temperature coefficient of roughly 2000ppm / degree, and so when changing the gain using an attached resistor, gain will also change at a rate of roughly 2000ppm / degree. There is virtually no gain variation due to temperature when using the internal input resistor. (7) Be sure to connect the IC to a 0.1F bypass capacitor to the power supply, at the base of the IC. (8) The radiating fin is connected to the package's internal GND, but should also be connected to an external ground. (9) The capacitor between regulator output (pin 6) and GND also serves to prevent oscillation of the IC, so select one with good temperature characteristics. 470 Optical disc ICs BA6395AFP FExternal dimensions (Units: mm) 471 |
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