3957 Datasheet (Allegro MicroSystems) - FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

3957, FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

Slow Current-Decay Mode Mixed Current-Decay Mode Fast Current-Decay Mode Table 3 * DAC Truth Table DAC Data D3 H H H H H H H H L L L L L L L Current D0 H L H L H L H L H L H L H L X D2 H H H H L L L L H H H H L L L D1 H H L L H H L L H H L L H H L Ratio, % 100 95.7 91.3 87.0 82.6 78.3 7

3957 FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER A3957SLB NO CONNECT PFD REF NO CONNECT RC GROUND GROUND D3 LOGIC SUPPLY PHASE D2 NO CONNECT 1 2 3 4 5 6 7 8 9 10 11 12 NC VCC NC NC NC VBB NC 24 23 22 21 20 19 18 17 NC 16 15 NC 14 13 NO CONNECT LOAD SUPPLY OUTB NO CONNECT D0 GROUND GROUND SENSE NO CONNECT OUTA NO CONNECT D1 Data Sheet 29319.44† The A3957SA and A3957SLB are designed for driving one winding of a bipolar stepper motor in a microstepping mode.

The outputs are rated for continuous ou

3957 Features

* s s s s s s s s s ±1.5 A Continuous Output Current 50 V Output Voltage Rating Internal PWM Current Control 4-Bit Non-Linear DAC for 16-Bit Microstepping Satlington™ Sink Drivers Fast, Mixed Fast/Slow, and Slow Current-Decay Modes Internal Transient-Suppression Diodes Internal Thermal-Shutdown Circui