BA6191

Optical disc ICs 2-channel reversible-motor driver BA6191 The BA6191 is a 2-channel motor driver for CD player changers and electric volume switches, among other applications. Because it uses a negative power supply, this IC uses the power supply of application products efficiently. FApplications CD player, etc. FFeatures 1) Two-channel reversible-motor driver. 2) Four modes - forward, reverse, stop (free rotation) and brake are output according to control logic input (two inputs). 3) Output voltage is set with the Vref pin. FAbsolute maximum ratings (Ta = 25_C) 4) Internal power supply voltage drop mute circuit. 5) Internal thermal shutdown circuit. 6) Negative power supply. FRecommended operating conditions (Ta = 25_C) 154 Optical disc ICs FBlock diagram BA6191 FPin descriptions 155 Optical disc ICs FInput / output circuits BA6191 156 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta=25_C, VCC=10V, Vref=2.5V) BA6191 FCircuit operation (1) Forward / reverse control block The IC outputs the forward, reverse, stop (free rotation) or brake mode in accordance with the two control logic inputs. 〈Forward and reverse modes〉 An output voltage twice that of the reference voltage is generated. 〈Stop mode〉 Each pin changes to the high impedance state. 〈Brake mode〉 Each pin outputs 0V. Logic input and output truth table 1) Normal voltage is not output when the reference voltage is below 1.0V or about VCC / 2–1.0V. 2) VCC is the reference voltage for...