Having big problems getting my DRV8432 prototype up and running. I am driving a 1.8 degree/step stepper motor, Anaheim Automation PN 34Y004S-LW8 with a simple full-step algorithm, and PWMing the drive pins to set operating current. I have already done a successful design w the DRV8825, but my client now wants faster/more torque. First question is pretty fundamental: WHERE IS PIN ONE? The spec document shows that the notched corner marks pin 1, but I found a TI user forum entry that suggests that the corner marked on top with a circle w three lines through it is actually Pin 1. So which is true? I went with the circle on my first build, and the parts seem to work with no load on them, I can see PWM output on the OUT A,B,C,D pins, but the instant I hook up a stepper motor to the outputs the DRV8432 dies. The 12V lines (GVDD) draw around 30mA before this, then after the part is damaged, GVDD current draw is over 250 mA. Measured resistance ground to GVDD on the dead parts is about 90 ohms static measurement, so the DRV8432 has apparently shorted out internally.
The documentation shows the notch on the part marking PIN 1 but NOT at the corner the notch actually appears on the part! What's correct here?
Is there an update available regarding the above customer inquiry?
ACSC Digital Apps
this is what the part looks like
spec sheet shows this:
Don't expect too much help on this part. :-(
Pin1 is in the lower left corner in your photo. I can confirm this as my parts drives motors without smoke or popping sounds when mounted according to this.
(I'm not a TI employee)
Please see picture attached from our fully functional evaluation board. I removed the heatsink to take the picture.
Motor Drive Application Manager
Are those boards available now?
In the process of releasing the EVM this week...please check back next week on the web for ordering.
Thank you both. Having not heard from anyone at TI, I went to the online documentation for the EV kit and looked at the Gerbers, and deduced the same thing.
Oh...and the reason that I smoked a few chips was that I hadn't added dead time in between stepper phases. DUH. 5 microseconds does the trick.
This chip ROCKS. I can run at 7 Amps for hours with a reasonable heat sink and the heat sink just gets a bit warm. The stepper actually got a lot hotter than the IC.
My heat sink is Mouser PN 774-73452PPBA. It's 1.5 by 2 inches and has about the same heat rise rating as the one TI uses on the Dev Kit.
You'll need to drill a couple of holes to mount to your PCB, but it works like a charm.
Can you give a link to the order page? I cannot find it.
Are you looking for the DRV8432 chip itself, a DRV8432 EVM, or the heatsink mentioned earlier?
I am looking for the elusive DRV8432EVM!
On my own PCB it (DRV8432) sometimes works, sometimes not. Alas I did not put in enough test points for scope probes. And I need a proven PCB where I can rule out problems related to components, traces etc. My customer are not happy at the moment.
I'm workign for TI in Germany and responsible for the marketing of these DRVx parts in Europe. I have some DRV8432 EVMs in my office and can ship them to you.
Can you please send me you contact details via firstname.lastname@example.org?
I am very grateful that you can help me! You should have my email now.
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