BA6970FS

Motor driver ICs 2-phase motor driver for VCR cylinder motors BA6970FS The BA6970FS is a direct-drive motor driver suitable for 2-phase, full-wave linear motors. The IC consists of a Hall amplifier control circuit, driver circuits, FG / PG signal amplifiers, and hysteresis amplifiers. FApplications VCR cylinder motors FFeatures 1) Linear drive system provides low switching noise. 2) Output current can be controlled by either current or voltage input. 3) Two amplifiers and two hysteresis amplifiers. FBlock diagram 4) Constant supply voltage pin for hall devices. 5) High ratio of output current and control current. (4000 typically) 6) Available in a compact surface-mount package. 594 Motor driver ICs FAbsolute maximum ratings (Ta = 25_C) BA6970FS FRecommended operating conditions (Ta = 25_C) 595 Motor driver ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 12V) BA6970FS 596 Motor driver ICs FPin descriptions BA6970FS 597 Motor driver ICs FInput / output circuits (1) ECV (22 pin) BA6970FS (4) I / O of amplifiers 1 and 2 Fig.1 (2) Coil output (8, 6, 5, 3 pin) Fig.4 (5) I / O of hysteresis amplifiers Fig.2 (3) Hall inputs (9, 10, 11, 12 pin), ECI input Fig.5 ∗Note that the resistance values can vary ±30% Fig.3 598 Motor driver ICs FCircuit operation (1) The signal from the Hall device is amplified by the Hall amplifier and then supplied to the driver circuit. The driver gain, which is constant, is regulated by changing the Ha...