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| Optical disc ICs 4-channel BTL driver for CD players BA6397FP The BA6397FP is a 4-channel BTL driver for CD player motors and actuators. The 5V regulator and internal standard operational amplifier make this IC suited to a broad range of applications. FApplications CD players and CD-ROM drives FFeatures 1) HSOP 28-pin package allows for miniaturization of applications. 2) Low number of external components. 3) Driver gain is adjustable with a single attached resistor. FAbsolute maximum ratings (Ta = 25_C) 4) Internal 5V regulator. (requires attached PNP transistor) 5) Internal standard operational amplifier. 6) Internal thermal shutdown circuit. FRecommended operating conditions (Ta = 25_C) 332 Optical disc ICs BA6397FP FBlock diagram 333 Optical disc ICs FPin descriptions BA6397FP 334 Optical disc ICs FInput / output circuits BA6397FP 335 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, f = 1kHz, RL = 8) BA6397FP 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 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. 336 Optical disc ICs (2) Regulator This is a typical series regulator that generates a reference voltage internally. A PNP low saturation type transistor must be connected. BA6397FP (3) Operational amplifier A standard 4558 type. FApplication example 337 Optical disc ICs FOperation notes (1) The BA6397FP 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) Muting occurs during thermal shutdown, mute-on operations or a drop in the bias pin voltage. In each case, only the drivers are muted. During muting, the output pins remain at the internal bias voltage, roughly (VCC-VF) / 2. BA6397FP (5) 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. (6) Be sure to connect the IC to a 0.1F bypass capacitor to the power supply, at the base of the IC. (7) The radiating fin is connected to the package's internal GND, but should also be connected to an external ground. (8) The capacitor between regulator output (pin 6) and GND also serves to prevent oscillation of the IC, so select one with good temperature characteristics. FElectrical characteristic curves 338 Optical disc ICs FElectrical characteristic curves BA6397FP FExternal dimensions (Units: mm) 339 |
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