ROHM BA6193

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