Hello, has anyone tried to improve standard ic stepper drivers with external mosfets? For example: Trimatic TMC2130 can drive up tp 2.5A peak. How to improve to 5A? Trimatic has curcuits that can have external mosfets, but the are very expensive. regards Wolfgang
Gast
#5820979
It is not so easy to add external transistor to such a standard product because the timing would not match. There must be a certain delay between switching off one transistor and switching on the oppostive transistor (High/Low side), and that depends on the technical data of the transistors itself. Also the chip internal overload protection cannot work with external transistors attached.
Wolfgang M. schrieb: > has anyone tried to improve standard ic stepper drivers with external > mosfets? > > For example: > Trimatic TMC2130 can drive up tp 2.5A peak. How to improve to 5A? since each output is a half bridge it could work, but Figure 1.2 in this [1] datasheet shows an arrow labeled ISENSE from each halfbridge, aditionally to the current sense from the Resistor. So i would expect at least some (if not all) functions related to current sensing to stop working properly, which is basically everything. the Datasheet says something about an integrated current sense option, so maybe these can be disabled. additional dead time needed for external Mosfets might be a problem (that has no easy solution). SOA control (for the mosfet) is not possible anymore. each output ranges from 0V to VCC, external mosfets would only take up to 20V between gate and source, so there would need to be (a very fast, at least some orders of magnitude faster than internal switching) circuit to keep the gate voltage in the allowed range. the more delay until the external mosfet switches, the more malfunction is to be expected. there are many Motor Drivers that can handle 46V and 5A, why don't you take one of those? [1] https://www.trinamic.com/fileadmin/assets/Products/ICs_Documents/TMC2130_datasheet.pdf
Use TMC5160, which can drive external Fets up to sevaral Amps directly. Coupled with dual N-Channel Fets gives you a nice little board. Or use the TMC5160 BOB (Break Out Board) and change the fets on this module to your needs.
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