Optical disc ICs 5-channel BTL driver for CD and MD Players BA6996FP The BA6996FP, 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. Applications CD players, CD-ROM drives, MD players and other optical disc devices Features 1) A 5-channel BTL driver in a HSOP 28-pin package, allowing for application miniaturization. 2) Five drivers are turned on and off according to the combination of control pin logic. 3) The tray driver operates even when the servo power supply drops. Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 502 4) 5) 6) 7) Internal thermal shutdown circuit. Gain is adjustable with an attached resistor. Internal standard operational amplifier. Supports low-voltage servos. Optical disc ICs BA6996FP Block diagram 503 Optical disc ICs Pin descriptions 504 BA6996FP Optical disc ICs BA6996FP Input / output circuits 505 Optical disc ICs Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 8V, f = 1kHz, RL = 8Ω) 506 BA6996FP Optical disc ICs BA6996FP Measurement circuit 507 Optical disc ICs Application example 508 BA6996FP Optical disc ICs BA6996FP Operation notes (1) Setting the tray motor driver voltage (forward mode) (2) Mute functions (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) Be sure to connect the IC to a 0.1µF bypass capacitor to the power supply, at the base of the IC. (5) Connect the radiating fin to an external ground. Thermal shutdown The output current is muted when the chip temperature exceeds 175C (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). 509 Optical disc ICs Electrical characteristic curves 510 BA6996FP Optical disc ICs BA6996FP External dimensions (Units: mm) 511 Optical disc ICs MEMO 512