Optical disc ICs 4-channel BTL driver for CD players BA6197FP The BA6197FP, an IC for CD players, has a 4-channel BTL driver, 5V regulator (attached PNP transistor required), standard operational amplifier, and internal reset output linked to an internal thermal shutdown circuit. The driver has gain adjustment input pins for each channel, allowing gain to be set to the desired value. Also, the internal level shift circuit helps reduce the number of attached components. FApplications CD players, CD-ROM drives and other optical disc devices FFeatures 1) 4-channel BTL driver on a HSOP 28-pin power package, allowing for application miniaturization. 2) Gain is adjustable with an attached resistor. 3) Internal thermal shutdown circuit with hysteresis capabilities. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 298 4) Internal 5V regulator. (required attached PNP transistor) 5) Internal standard operational amplifier. 6) Reset output pin. Optical disc ICs BA6197FP Block diagram 299 Optical disc ICs Pin descriptions 300 BA6197FP Optical disc ICs BA6197FP Input / output circuits 301 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, f = 1kHz, RL = 8Ω) 302 BA6197FP Optical disc ICs BA6197FP Measurement circuit 303 Optical disc ICs Measurement circuit switch table 304 BA6197FP Optical disc ICs BA6197FP Application example 305 Optical disc ICs BA6197FP Operation notes (1) Muting and resetting (2) The circuit is muted during thermal shutdown and during the mute-on state. In each case, only the drivers are muted. During muting, the output pins remain at the internal bias voltage, roughly (VCC-VF) / 2. (3) When using an attached resistor to change the gain, the temperature characteristics of the internal feedback resistors results in temperature variation in the gain (relative to the typical value) of )4600ppm per degree. There is virtually no temperature variation in error due to resistance variation. Electrical characteristic curves 306 (4) Be sure to connect the IC to a 0.1µF bypass capacitor to the power supply, at the base of the IC. (5) The radiating fin is connected to the packages internal GND, but should also be connected to an external ground. (6) The capacitor between regulator output (pin 6) and GND also serves to prevent oscillation of the IC, so select one with good temperature characteristics. (7) Pins 5 and 6 may be left open when the regulator is not used. (8) Pins 14, 15 and 16 may be left open when the operational amplifier is not used. Optical disc ICs BA6197FP External dimensions (Units: mm) 307