- THB6128 chip
- Motor voltage 10 – 25V
- Motor current 0 to 2.2 A adjustable via potentiometer (V-REF)
- Motor decay adjustable via potentiometer (Decay)
- Sleep and Boost Mode
- Logic voltage is generated from the motor voltage
- Up to 128 micro steps possible (recommended maximum of 32 micro steps for 8-bit electronics, such as Arduino Mega with RAMPS.)
- Short Circuit Shutdown
- Pre-installed heat sink
- The size corresponds to the popular Pololu drivers and the pinout is compatible but not identical.
- Max 1/128 micro stepping when used in combination with RADDS (or other 32-bits controllers that supports 1/128 micro stepping)
- Can be used on RAMPS, rumba and other RepRap electronics, but 8-bit electronics usually are too slow for 1/64 and 1/128 micro stepping.
CAUTION: Inverted activation signal Enable = HIGH (at Pololu drivers enable = LOW, invert in firmware!)
V1 – This is the first RAPS128
V2 – C1 change from 10 µF to 0.1µF
The arrows indicate the measurement points for the reference voltage. Use a voltmeter and measure the voltage between the ground terminal and the pot wiper on the driver’s v-ref potentiometer.
Recommended voltage range: 0.8 to 1.6 V. This corresponds to a theoretical peak engine power from 0.73 to 1.46 A
By turning the decay potentiometer, the way of voltage and current decay in the motor coils is changed. A medium setting has been proven to work with many Nema 17 motors.”