@Vernon Barry posted:Regarding the lower amperage version of the Lionchief motor driver daughter card- found in many new recent Lionchief with Bluetooth boards.
Looking those parts up, those are IRF7343 https://www.infineon.com/dgdl/...00a4015355f68c1a1b73
Key rating here is the P channel side of this dual MOSFET limited to 3.4A however dropping to 2.7 quickly at 70C temp.
Again, in an H bridge, one P channel conducts, and one N channel to drive the motor in a given direction. So the limit is the lowest device in the chain (typically the P channel MOSFET which has higher ON resistance).
VS, the older motor driver daughter card.
That driver card uses discrete components rather than these combined chip solution seen in the more recent boards.
IRF5305 https://www.infineon.com/dgdl/...00a401535632522820ff
IRLR024N https://www.infineon.com/dgdl/...00a4015356694f7f265d
This nets a worst case 12A "rating".
Now key here, this is just showing the transistors, not the circuit traces, not the bridge rectifier, not how strong the gate is driven and to what voltage, how well are the transistors heatsinked and so forth.
So if I understand correctly, "to be safe", should try to use the drivers currently installed rather than rely on just plugging the motor into the Lionchief board, correct? Which I am not sure how to implement.
Think I am better off just making sure the Lionchief board I buy has the High Power Rating. How do I figure this out when purchasing a board?
