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| 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. FApplications CD players and CD-ROM drives FFeatures 1) 3-channel BTL driver. 2) HSOP 25-pin power package allows for application miniaturization. 3) Internal standby function. 4) Internal thermal shutdown circuit. FAbsolute maximum ratings (Ta = 25_C) 5) Gain is adjustable with an attached resistor. 6) Internal 5V regulator. (requires attached PNP transistor) 7) Internal standard operational amplifier. FRecommended operating conditions (Ta = 25_C) 176 Optical disc ICs FBlock diagram BA5933FP-Y 177 Optical disc ICs FPin descriptions BA5933FP-Y 178 Optical disc ICs FPin equivalent circuit diagrams BA5933FP-Y 179 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, BIAS = 2.5V, RL = 8) BA5933FP-Y 180 Optical disc ICs FMeasurement circuit BA5933FP-Y 181 Optical disc ICs FApplication example BA5933FP-Y 182 Optical disc ICs FOperation notes (1) The BA5933FP-Y has a thermal shutdown circuit. The output current is muted when the chip temperature rises above 175_C (typically). When the chip temperature falls to 150_C (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 FElectrical characteristic curves BA5933FP-Y remain at the internal bias voltage, roughly (VCC / 2). (5) Connect the IC to a 0.1F 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. 183 Optical disc ICs BA5933FP-Y FExternal dimensions (Units: mm) 184 |
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