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| Optical disc ICs 5-channel BTL driver for CD players BA6796FP The BA6796FP, an IC designed for CD and MD players, has a 5-channel BTL power driver and a standard operational amplifier. The spindle and tray driver share a single output buffer, and are specified with a control pin. In addition, the internal level shift circuit reduces the number of attached components. FApplications CD players, CD-ROM drives, MD players and other optical disc devices FFeatures 1) 5-channel BTL driver in a 28-pin HSOP package, allowing for application miniaturization. 2) The five drivers are turned on and off according to control pin logic combinations. 3) The tray driver operates even when the servo power supply drops. FAbsolute maximum ratings (Ta = 25_C) 4) Internal thermal shutdown circuit. 5) Gain is adjustable with an attached resistor. 6) Internal standard operational amplifier. FRecommended operating conditions (Ta = 25_C) 483 Optical disc ICs FBlock diagram BA6796FP 484 Optical disc ICs FPin descriptions BA6796FP 485 Optical disc ICs FInput / output circuits BA6796FP 486 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, f = 1kHz, RL = 8) BA6796FP 487 Optical disc ICs FMeasurement circuit BA6796FP 488 Optical disc ICs FMeasruement circuit switch table BA6796FP 489 Optical disc ICs FFunction description CTL and CTL2 BA6796FP F and R (channel 5 control enabled only when channel 5 is on) 490 Optical disc ICs FApplication example BA6796FP 491 Optical disc ICs FOperation notes (1) Setting the tray motor driver voltage (forward mode) BA6796FP (2) Mute functions %Thermal shutdown& The output current is muted when the chip temperature exceeds 175_C (typically). %Supply voltage drop muting& The internal circuits turn off when the supply voltage drops below 4.3V (typically), and turn on again when it rises above 4.5V (typically). FElectrical characteristic curves %Bias drop muting& Muting also occurs when the bias pin voltage (26 pin) is lowered below 1.4V (typically). Be sure the voltage stays between 1.6V and 6.5V during normal operation. (3) Muting occurs during thermal shutdown and when the supply voltage or bias pin voltage drops. In each case, only the driver is muted. The output pin voltage during muting is the internal bias voltage, roughly VCC- VF / 2. (4) Attach a 0.1F bypass capacitor to the power supply, at the base of the IC. (5) Connect the radiating fin to an external ground. 492 Optical disc ICs BA6796FP FExternal dimensions (Units: mm) 493 |
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