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1 / 16 page L6285 3 CHANNELS MULTIPOWER SYSTEM ADVANCE DATA CHANNEL-A AND CHANNEL-B FOR UNIPO- LAR STEPPER MOTORS – LOW SIDE: RDSON = 1.2 Ω – HIGH SIDE ; RDSON = 1.2 Ω CHANNEL-C FOR DC MOTORS – LOW SIDE: RDSON = 1.7 Ω – HIGH SIDE: RDSON = 1.2 Ω CHOPPING MODE DRIVING FOR C.L. CUR- RENT CONTROL ON CHA AND CHB AND O.L. VOLTAGE CONTROL ON CHC. INTERNAL FOUR DRIVING LATCHES 16 BIT INTERNAL SHIFT REGISTER DIRECT INTERFACE TO µP SERIAL DRIVING SEQUENCE LOADING CMOS COMPATIBLE INPUTS PRE-ALARM OUTPUT SIGNAL THERMAL SHUTDOWN DESCRIPTION This Combo Motor Driver uses large scale inte- gration to incorporate several functions into the same chip. 1) Two unipolar stepper motor driver 2) A full bridge DC motor driver 3) Serial microprocesor interface The power output stages are DMOS and the input can be interfaced to a CMOS Microprocessor logic. The phase current in the unipolar stepper motor windings is controlled by two external sensing re- sistors in fixed frequency chopping mode. The os- cillator block provides clocks each other 180 ° out of phase to the two stepper motor driver in order to avoid symultaneous current peaks. For the DC motor driver is used a bridge; the RMS voltage to supply this motor is fixed by a This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. May 1994 ORDERING NUMBERS: L6285 L6285S PLCC44 SDIP42 MULTIPOWER BCD TECHNOLOGY BLOCK DIAGRAM 1/16 |
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