Optical disc ICs 2-channel reversible-motor driver BA6193 The BA6193 is a 2-channel motor driver for CD player changers and electric volume switches, and other applications as well. Because it uses a negative power supply, this IC uses the power supply of application products efficiently. Applications CD players and CD-ROM drives with loading features, etc. Features 1) Reversible-motor driver with dual independent channels. 2) Four modes forward, reverse, stop (free rotation) and brake are output according to control logic input (two inputs). Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 160 3) 4) 5) 6) Output voltage is set with the Vref pin. Internal power supply voltage drop mute circuit. Internal thermal shutdown circuit. Negative power supply. Optical disc ICs BA6193 Block diagram Pin descriptions 161 Optical disc ICs Input / output circuits Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 25C, Vref = 2.5V) 162 BA6193 Optical disc ICs BA6193 Measurement circuit 163 Optical disc ICs Input and output truth table Application example 164 BA6193 Optical disc ICs Operation notes 1) The BA6193 has an internal shutdown circuit with hysteresis capabilities. Output current is muted when the chip temperature exceeds 175C (typically) and restored when the chip temperature falls to 150C (typically). 2) The output current is muted when the power supply voltage (VCC) drops below 3.0V. During muting, the output voltage is VEE. 3) In the forward and reverse modes, an output voltage twice that of the reference voltage is generated. BA6193 However, normal voltage is not output when the reference voltage is below 1.0V or about VCC / 2–1.0V. 4) Vcc is the reference voltage for the input voltage of logic input pins. In terms of potential relative to VEE, the HIGH level is (VCC+5.0)V and the LOW level is VCC. Fig. 6 shows each pin’s potential level. 5) Be sure to attach a bypass capacitor to the power supply, at the base of the IC. Electrical characteristic curves 165 Optical disc ICs External dimensions (Units: mm) 166 BA6193