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| Optical disc ICs 4-channel BTL driver for CD players BA6797FP / BA6797FM The BA6797FP and BA6797FM are 4-channel BTL power drivers for CD players and each have an internal 5V regulator (requires attached PNP transistor). Because the input stage of each driver channel connects to an operational amplifier, and there are both positive and negative input pins, making these ICs adaptable for a wide range of inputs and greatly simplify filter configuration. In addition, the internal level shifting circuit reduces the number of external components. FApplications CD players, CD-ROM drives and other optical disc devices FFeatures 1) 4-channel BTL driver in a HSOP 28-pin power package, ideal for application miniaturization. 2) Wide dynamic range. 3) Internal thermal shutdown circuit. 4) Internal level shifting circuit reduces the number of external components. 5) Dual positive and negative input pins, for adaptability for a wide range of inputs (including negative phase input). Also simplifies filter configuration. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 364 Optical disc ICs FBlock diagram BA6797FP / BA6797FM 365 Optical disc ICs FPin descriptions BA6797FP / BA6797FM 366 Optical disc ICs FInput / output circuits BA6797FP / BA6797FM 367 Optical disc ICs BA6797FP / BA6797FM FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, f = 1kHz, RL = 8) 368 Optical disc ICs FMeasurement circuit BA6797FP / BA6797FM 369 Optical disc ICs FMeasurement circuit switch table BA6797FP / BA6797FM 370 Optical disc ICs FApplication example BA6797FP / BA6797FM FOperation notes (1) The BA6797FP and BA6797FM have an internal thermal shutdown circuit. Output current is muted when the chip temperature exceeds 175_C (typically). (2) If the mute pin (pin 9) voltage is opened or lowered below 0.5V, the output current will be muted. Pin 15 should be pulled up above 2.0V during normal use. During muting, the output pins remain at the internal bias voltage, roughly (VCC / 2). (3) The bias pin (pin 8) is muted when lowered below 1.4V (typically). Make sure it stays above 1.6V during normal use. (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. (6) The capacitor between regulator output (pin 7) and GND also serves to prevent oscillation of the IC, so select one with good temperature characteristics. 371 Optical disc ICs FElectrical characteristic curves BA6797FP / BA6797FM 372 Optical disc ICs FExternal dimensions (Units: mm) BA6797FP / BA6797FM 373 |
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