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. Applications Power drive for CD and MD players Features 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. Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 832 5) Low on-resistance. 6) Low power consumption. 7) Compact SSOP-A32 package. Motor driver ICs BH6514AFS Block diagram 833 Motor driver ICs Pin descriptions 834 BH6514AFS Motor driver ICs BH6514AFS Input / output circuits 835 Motor driver ICs BH6514AFS Electrical characteristics (unless otherwise noted, Ta = 25C, VM = 2.5V, VDD = 3V, Electrical characteristics (VG is the internally pumped output, f123IN = 176kHz, fUVWIN = 1kHz, and RL = 8Ω–47µH) 836 Motor driver ICs BH6514AFS Measurement circuit 837 Motor driver ICs Circuit operation Driver truth table Focus / tracking coil Brushless motor power supply Stepping motor 838 BH6514AFS Motor driver ICs BH6514AFS Application example 839 Motor driver ICs Operation 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. External dimensions (Units: mm) 840 BH6514AFS