Optical disc ICs 3-channel BTL driver for CD players BA5933FP-Y The BA5933FP-Y is a 3-channel BTL driver for CD player actuators and motors. This IC has an internal 5V regulator and a standard operational amplifier, and comes in a HSOP 25-pin package, allowing for application miniaturization. Applications CD players and CD-ROM drives Features 1) 3-channel BTL driver. 2) HSOP 25-pin power package allows for application miniaturization. 3) Internal standby function. 4) Internal thermal shutdown circuit. Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 176 5) Gain is adjustable with an attached resistor. 6) Internal 5V regulator. (requires attached PNP transistor) 7) Internal standard operational amplifier. Optical disc ICs BA5933FP-Y Block diagram 177 Optical disc ICs Pin descriptions 178 BA5933FP-Y Optical disc ICs BA5933FP-Y Pin equivalent circuit diagrams 179 Optical disc ICs Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5V, BIAS = 2.5V, RL = 8Ω) 180 BA5933FP-Y Optical disc ICs BA5933FP-Y Measurement circuit 181 Optical disc ICs Application example 182 BA5933FP-Y Optical disc ICs Operation notes (1) The BA5933FP-Y has a thermal shutdown circuit. The output current is muted when the chip temperature rises above 175C (typically). When the chip temperature falls to 150C (typically), the driver circuit starts up again. (2) The output current can be muted by opening the mute pin (pin 6) voltage or lowering it below 0.5V. During normal use, pin 6 should be pulled up above 2.0V. (3) The bias pin (pin10) is muted when lowered below 1.4V (typically). Make sure it stays above 1.6V during normal use. (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 BA5933FP-Y remain at the internal bias voltage, roughly (VCC / 2). (5) Connect the IC to a 0.1µF 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 GND. (7) The capacitor between regulator output (pin 8) and GND also serves to prevent oscillation of the IC, so select one with good temperature characteristics. (8) The IC can be switched to the standby mode by opening the standby mode switch (pin 1) voltage, or lowering it below 0.5V. During normal use, pin 1 should be pulled up above 2.0V. Electrical characteristic curves 183 Optical disc ICs External dimensions (Units: mm) 184 BA5933FP-Y