A problem of DRV8432 DC MOTOR DRIVE

Hello,

For starters, the BS capacitors need to be directly connected to the outputs....not on the other side of the output inductors.  Also, what is your PVDD and GVDD voltage?  What load are you driving...DC motor or other?

Finally, are you sure the package is soldered in the right direction?  Pin 1 indicator is a little hard to see sometimes.  I have attached a sample picture from the EVM.  This is a common mistake.

Also, an EVM is available online for purchase.  It might be cheaper than trying to build and debug your own board.

http://www.ti.com/tool/drv8432evm

Thanks for your help.

But the problem is not solved....

And I run DC_MOTOR(RE40).

PVDD voltage : 24V, GVDD voltage : 12V, the GVDD source is regulated by 7412 from PVDD.

BTS CAP : 0.1uF, PWM Frequency : 10kH.

Why the PVDD_C, GND, OUT_C, BTS_C are short??? under voltage of  PVDD or GVDD??? 

Did you replace the IC and fix the BS capacitor connections?  Try this first.

What is your application and target yearly run rate?

Can I use a independant source of PVDD and GVDD???

Now I use GVDD(12V) regulated by 7812 from PVDD(24V).

The source  from 24Volt power supply.

Not exactly sure what you are asking, but let me see if I can guess.

You can power the PVDD from a seperate 24V supply and GVDD from another regulated supply.  Or, you can use a liner regulator exactly as you are doing now.  As long as the voltage range is within the datasheet limits, you are OK.

Can you recommend motor drive that can run 200W DC motor, not  DRV8432???

Sorry, the DRV8432 is the best option or you can consider the DRV8412 with parallel mode. 

If you can get another unit working again like you once did and can get some scope captures of the output when changing directions, then I might be able to explain how the damage has occurred.  With the limited details you have given me, I can't make any guesses.

Alternatively, we have an available EVM that will give you a reference point for further analysis and is properly routed for best performance. 

Thanks!

Hello

I am Ethan Yang.

The same problem occurs on my driver.

When my DC motor is not connected to the output of DRV8432, the circuit is workable (I check the output PWM waveform, no matter forward or reverse).

Then I connecting the DC motor and let it goes forward, it works great. But next moment I let it go reverse, it dies.

I try 3 times and 3 DRV8432 all die. My motor is 50W, 24V, DC motor.

My schematic is same as the application diagram example for parallel full bridge mode operation. (2 full bridge CBC mode is also tried).

PVDD is 24V, GVDD is 12V, and control I/O is 3.3V.

Sorry for my poor English.

Hello Ethan,

Do you have a schematic and perhaps a snapshot of your layout around the DRV8432?

Best Regards,

Nick

Hello Nick

Sorry that I don't have the schematic & layout and I test them on the peg board.

The schematic is almost same as the datasheet example and only some parts are different.

The output protect inductors are 2.2uF,  no Rsense, no output capacitors (example schematic doesn't have but EVM schematic has), Roc_adj is 2.7 ohm.

+12V & +3.3V are regulated from +24V. The DRV8432 always dies when the output changing direction.

Originally I want to try the fake load (use cement resistors) and use higher inductors, but I don't have more DRV8432 can try it. So....

Thanks

Hi

I am Woo yong Kim who registered this problem and solved one year ago.

To solve this problem, I kill a lot of chips.....

I hope that you don't experience mental break....

I didn't know what is the main problem of this situation.

But in your case, the current shock occurs the problem. 

I propose connect coil front of DC 24 or main source of your board to prevent current shock.

And please give me your e-mail address. If you do so, I will send the schematic of my DRV 8432 board.  

hi WOO yong Kim, Im a student from VietNam, can u share me your sche drv 8432 board without error, my email 21100092@stu.hcmut.edu.vn thank you so much!