September 9, 2011: AE-STPR8818
Although the STPR8811 stepper module will accept a DRV8818 with no problem, I thought of
creating a little module for the new 2.5A stepper driver from Texas Instruments. The DRV8818 is in essence 100% compatible to the DRV8818, except for reduced voltage range. In return, the user gets
improved thermal capabilities as the DRV8818 was designed with larger power FETs packing lower RDSon. In fact, the DRV8818 will reach the 2.5A sine wave peak mark without much effort. And the
2.5A mark runs so well, we are even studying the possibility of taking this little module to the extreme.
On this module we have removed the diodes as there is really no need to have external diodes in
order to run cooler. The board is also smaller, following the 2.5” x 2.5” form factor. No need for a
fan or a heat sink although pads are available in case you want to strap one on. But really, chances are you will not need it!
NOTE: This module was superseded by the AE-STPR8818-TP as we have merged to using
Power Peg technology for improved thermal impedance and enhanced performance.