Gene,
Where did you buy that H bridge board ? Ebay ?
Dave
On 11/9/2020 5:15 PM, Gene Heskett wrote:
On Wednesday 28 October 2020 16:02:51 Gene Heskett wrote:
On Wednesday 28 October 2020 14:30:39 Chris Albertson wrote:
I bit of information from Polulu's web site. They say..
"*While VNH3SP30’s over-voltage shutoff doesn’t activate until 36 V,
in our experience, shoot-through currents make PWM operation
impractical above 16 V.*"
Which pretty well explains my problems.
Its taken way too long, but I may have found the driver I need. Miniature
board and heat sink for about $13/copy. Has a pair of Infineon BTS7960B
chips on a pcb about 1.5" square, rated for up to 45 volts and 43 amps
for each chip and 2 make a full H-bridge. From the looks, its not the
datasheet hookup, but has a 74HCT244 in tsop style for an input buffer.
Looks like it needs a ground and 5 volts, and probably an enable input,
and up and down pwms, mode 2 IOW. Needless to say, no example hookups
are to be had. But I'm prowling around in googles output now. Found
them:
<https://www.handsontec.com/dataspecs/module/BTS7960%20Motor%20Driver.pdf>
Interestingly, this one is stated to only be good till 27 volts, not the
infineon 45 volts. Bridge chips are labeled with an extra B. 2nd grade
stuffs? Probably. I'll advise how it works when I get it wired up.
Cheers, Gene Heskett
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