DMOS DRIVER FOR BIPOLAR STEPPER MOTOR

■ OPERATING SUPPLY VOLTAGE FROM 8 TO 52V

■ 2.8A OUTPUT PEAK CURRENT (1.4A RMS)

■ RDS(ON) 0.73Ω TYP. VALUE @ Tj = 25°C

■ OPERATING FREQUENCY UP TO 100KHz

■ NON DISSIPATIVE OVERCURRENT PROTECTION

■ DUAL INDEPENDENT CONSTANT tOFF PWM CURRENT CONTROLLERS

■ FAST/SLOW DECAY MODE SELECTION

■ FAST DECAY QUASI-SYNCHRONOUS RECTIFICATION

■ DECODING LOGIC FOR STEPPER MOTOR FULL AND HALF STEP DRIVE

■ CROSS CONDUCTION PROTECTION

■ THERMAL SHUTDOWN

■ UNDER VOLTAGE LOCKOUT

■ INTEGRATED FAST FREE WHEELING DIODES

TYPICAL APPLICATIONS

■ BIPOLAR STEPPER MOTOR

DESCRIPTION

The L6228 is a DMOS Fully Integrated Stepper Motor Driver with non-dissipative Overcurrent Protection, realized in MultiPower-BCD technology, which combines isolated DMOS Power Transistors with CMOS and bipolar circuits on the same chip. The device includes all the circuitry needed to drive a two-phase bipolar stepper motor including: a dual DMOS Full Bridge, the constant off time PWM Current Controller that performs the chopping regulation and the Phase Sequence Generator, that generates the stepping sequence. Available in PowerDIP24 (20+2+2), PowerSO36 and SO24 (20+2+2) packages, the L6228 features a non-dissipative overcurrent protection on the high side Power MOSFETs and thermal shutdown.

BLOCK DIAGRAM

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