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| Optical disc ICs 4-channel BTL driver for CD players BA6793FP The BA6793FP is a 4-channel BTL driver for CD player actuators and motors. This IC has an internal 5V regulator and a standard operational amplifier, making it suitable for a wide spectrum of applications. FApplications CD players, CD-ROM drives FFeatures 1) 28-pin HSOP power package allows for application miniaturization. 2) Minimum attached components. 3) Driver gain is adjustable with a single attached resistor. 4) Internal 5V regulator. (requires attached PNP transistor) 5) Internal standard operational amplifier. 6) Internal thermal shutdown circuit. 7) Three separate power supplies. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 355 Optical disc ICs FBlock diagram BA6793FP FPin descriptions 356 Optical disc ICs FPin equivalent circuit diagrams BA6793FP 357 Optical disc ICs BA6793FP FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 12V, BIAS = 2.5V, f = 1kHz, RIN = 20k, RL=8) 358 Optical disc ICs FMeasurement circuit BA6793FP 359 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 BA6793FP 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. 360 Optical disc ICs FApplication example BA6793FP 361 Optical disc ICs FOperation notes (1) The BA6793FP has a thermal shutdown circuit. The output current is muted when the chip temperature rises above 175_C (typically). When the chip temperature falls to 150_C (typically), the driver circuit starts up again. (2) The output currents (channels 3 and 4) can be muted by pulling up the mute pins (pins 24 and 26) above 2.0V. During ordinary use, pins 24 and 26 should be left open or lowered below 0.5V. (3) Muting also occurs when the bias pin (pin 22) drops below 1.4V (typically). Make sure it stays above 2.0V during normal use. BA6793FP (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. (5) Connect the IC to a 1F bypass capacitor between power supplies, at the base of the IC. (6) The radiating fin is connected to the package's internal GND, but should also be connected to an external ground. (7) The capacitor between regulator output (pin 2) and GND also serves to prevent oscillation of the IC, so select one with good temperature characteristics. FElectrical characteristic curves 362 Optical disc ICs BA6793FP FExternal dimensions (Units: mm) 363 |
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