M54676P Datasheet PDF

MITSUBISHI M54676P 2-PHASE STEPPER MOTOR DRIVER DESCRIPTION The M54676P is a semiconductor IC to...

MITSUBISHI M54676P 2-PHASE STEPPER MOTOR DRIVER DESCRIPTION The M54676P is a semiconductor IC to drive a bipolar stepper motor by the micro step method by changing the coil current of the motor continuously. PIN CONFIGURATION (TOP VIEW) OutA Out ∗A SG A Sense A GND GND Vref A Phase A Phase ∗A 1 2 3 4 5 6 7 8 9 20 VM 19 OutB 18 Out ∗B 17 SG B 16 GND 15 GND 14 Sense B 13 VrefB 12 PhaseB 11 Phase ∗B FEATURES q Highly-accurate micro step drive by chopping sink output transistor and source output transistor simultaneously q Bipolar and constant current drive q Built in a thermal shutdown circuit and standby circuits q Built in flywheel diodes M54676P APPLICATION Office automation equipment such as printer and FAX Vcc5 10 Outline 20P4 FUNCTION The M54676P can drive a stepper motor by the 2-phase bipolar method and also controls the coil current. Furthermore, it controls the direction of the coil current by Ph input and the coil current value by Vref pin. Because two control circuits are built in this IC, a stepper motor can be driven with a single IC by the 2-phase bipolar method. BLOCK DIAGRAM OUT ∗A OUT A VrefB 13 Vcc5 10 20KΩ 6KΩ Internal bias VrefA 7 20 VM 1 2 Vref A Amp + - Vref 2 comparator + - 9KΩ 0.2V + - 1KΩ Current comparator Vref B Amp + - Vref 2 comparator + - 3 SGA 19 OUT B 18 OUT ∗B 9KΩ 1KΩ TSD 0.2V Current comparator + - 4 14 SenseA SenseB 8 PhaseA 9 Phase ∗A 11 12 PhaseB Phase ∗B 16 15 6 GND 5 17 SGB MITSUBISH...