4A 50V 3D Printer Stepstick S109 Stepper Motor Driver with Heatsink for 57 Stepper Motor/Pololu Pin

Introduction ●The S109 driver is based on theTB67S109 stepper motor driver chip design ●It employs four layers of thick copper precipitation PCB with automatic patch processing This driver uses the indexer DIR STEP control interface ●It can drive the 57 stepper motor compatible with the Pololu pin definition ●It can be used directly as a replacement for the A4988 module ​Main Features 1 use four layers of thick copper deposited gold PCB 2 allow full step half step 1 4 1 8 1 16 1 32 step 3 maximum input voltage 50V maximum output current 4A at good heat dissipation condition 4 equipped with large heatsink for better cooling effect 5 high efficiency motor current control as to advanced dynamic hybrid attenuation ADMD ADMD Technology its input current can be tracked more closely than the traditional mixed attenuation mode so it can realize high speed motor control under high speed conditions 6 chip built in error detection circuit thermal shutdown TSD over current shutdown ISD and power on reset POR Maximum limited current adjustment Current limits can be adjusted by measuring the VREF and the adjustable resistance pls check wiring diagram Connect the voltmeter to VREF to the GND and read the value S109 uses 0 10ohm current sense resistor so the current limits can be calculated as follows Current Limit VREF x 2 Please do not exceed the current rating of the motor current or motor and motor driver will be over heated o