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| Motor driver ICs Power driver for CD and MD applications BH6514AFS The BH6514AFS is a PWM driver for CD and MD motors and actuators. In addition to a two-channel "H" bridge for the actuators, the IC includes a three-phase driver for spindle motor drive, and a single-channel half bridge for synchronous rectification of the spindle drive VM. FApplications Power drive for CD and MD players FFeatures 1) Compatible with PWM input. 2) Charge pump circuit to increase VG. 3) Charge pump circuit has free-running oscillator. 4) Each "H" bridge power supply can be supplied independently for efficient application. FAbsolute maximum ratings (Ta = 25_C) 5) Low on-resistance. 6) Low power consumption. 7) Compact SSOP-A32 package. FRecommended operating conditions (Ta = 25_C) 832 Motor driver ICs FBlock diagram BH6514AFS 833 Motor driver ICs FPin descriptions BH6514AFS 834 Motor driver ICs FInput / output circuits BH6514AFS 835 Motor driver ICs BH6514AFS FElectrical characteristics (unless otherwise noted, Ta = 25_C, VM = 2.5V, VDD = 3V, FElectrical characteristics (VG is the internally pumped output, f123IN = 176kHz, fUVWIN = 1kHz, and RL = 8-47H) 836 Motor driver ICs FMeasurement circuit BH6514AFS 837 Motor driver ICs FCircuit operation Driver truth table Focus / tracking coil BH6514AFS Brushless motor power supply Stepping motor 838 Motor driver ICs FApplication example BH6514AFS 839 Motor driver ICs FOperation notes (1) The charge pump circuit is a x3 multiplier that uses the voltage on pin 30 as its reference. Therefore, set the voltage (VDD) on pin 30 so that the VG does not exceed its rating. (2) If you will use an externally-supplied VG, disconnect the capacitors between pins 31 and 32 and pins 1 and 2. BH6514AFS FExternal dimensions (Units: mm) 840 |
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