BA6853FS

Motor driver ICs 3-phase motor driver for CD-ROMs BA6848FP / BA6853FS The BA6848FP and BA6853FS are single-chip ICs developed for CD-ROM spindle motor drives. These ICs are 3phase, full-wave, pseudo-linear drives with FG output, FG composite output, and reverse-rotation pins built-in for high functionality and high performance. FApplications CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM FFeatures 1) Three-phase, full wave, pseudo-linear drive system. 2) Built-in PS pin for power save mode when ON. 3) Built-in thermal shutdown and current limiter circuits. FAbsolute maximum ratings (Ta = 25_C) 4) Built-in Hall bias circuit (for the BA6848FP). 5) Built-in FG output and FG composite output. 6) Built-in reverse-rotation pin. FRecommended operating conditions (Ta = 25_C) 781 Motor driver ICs FBlock diagram BA6848FP / BA6853FS 782 Motor driver ICs FPin descriptions BA6848FP BA6848FP / BA6853FS BA6853FS 783 Motor driver ICs FI / O circuit diagrams (1) Power save(PS) BA6848FP / BA6853FS (4) Coil output (A1, A2, A3) (2) Reverse (REV) (5) Hall input (H1), H1*, H2), H2*, H3), and H3*) (3) Torque command input (6) Hall bias Note: Resistances are typical values. 784 Motor driver ICs BA6848FP / BA6853FS FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, VM1 = 12V, VM2 = 12V) 785 Motor driver ICs BA6848FP / BA6853FS FCircuit operation (1) Hall input and output The phase relationship between the Hall input signals and the output current and volta...