A3957 Datasheet - Allegro

A3957 - 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 D2 D1 D0 HHHH HHH L HH L H HHL L H L HH HLHL HL LH HL L L L HHH L HH L LHLH LHL L L LHH L LHL LLLX Current Ratio, % 100 VREF/VS 3.00 95.7 3.13 91.3 3.29 87.0 3.45 82.6

Data Sheet 29319.44B 3957 FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER The A3957SLB is designed for driving one winding of a bipolar stepper NO 1 NC CONNECT NC 24 NO CONNECT motor in a microstepping mode.

The outputs are rated for continuous output currents to ±1.5 A and operating voltages to 50 V.

Internal pulse-width PFD 2 VBB REF 3 NO CONNECT 4 NC T RC 5 C GROUND 6 U GROUND 7 LOGIC D D 3 8 LOGIC O SUPPLY 9 VCC Y PHASE 10 R L D2 11 P N NO CONNECT 12 NC 23 LOAD SUPPLY 22 O

A3957 Features

* ±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

* In

A3957-Allegro.pdf