M54640P Datasheet - STEPPER MOTOR DRIVER

MITSUBISHI M54640P STEPPER MOTOR DRIVER DESCRIPTION The M54640P is a semiconductor IC to drive a...

MITSUBISHI M54640P STEPPER MOTOR DRIVER DESCRIPTION The M54640P is a semiconductor IC to drive a stepper motor by the bipolar method. PIN CONFIGURATION (TOP VIEW) Output MB ← 1 One-shot-multi T→ 2 time constant Output power VMM 3 supply 4 GND 5 Power supply VCC Output current value setting Output current direction switching I1 6 7 16 → E 15 → MA 14 13 GND 12 11 ← VR 10 ← C 9 Io Comparator reference input Comparator input Output current setting Current sensor Output FEATURES q Bipolar and constant-current drive q Wide current control rage (20 – 800mA) q Wide supply voltage drive range (10 – 40V) q Built in flywheel diodes q Current level can be changed by steps or continuously. q Built in a thermal shutdown circuit power VMM Output supply M54640P Ph → 8 APPLICATION Printer, FDD, HDD, Fax Outline 16P4 FUNCTION The M54640P drives a stepper motor by the bipolar drive method to change the current direction of a single coil and controls the current direction with PHASE input pin. In order to obtain higher efficiency, the constant current drive system to control the coil current is introduced. The current value can be selected among four levels (0 to max.) by selecting the combination of three internal comparators by logic input. It also can be continuously changed by controlling the reference voltage. Conversion to voltage is conducted by the current value sensing resistor (Rs) and the voltage is sensed with each comparator, and then each comparator...