BOOSTXL-DRV8323RS: Custom driver board for a BLDC Motor

Nicolas Gabriel Rios Taurasi

Part Number: BOOSTXL-DRV8323RS
Other Parts Discussed in Thread: CSD88599Q5DC

Hello,

We are developing a BLDC motor driver with DRV8323RS as Driver and CSD88599Q5DC as the power mosfets. After some tests with different settings of IDrive we decided to leave as default (IDRIVEP_HS=1000mA, IDRIVEN_HS=2000mA, IDRIVEP_LS=1000mA, IDRIVEN_LS=2000mA, DeadTime = 100nS). With these settings we made a stress test with a mean power compsumition of the motor about 250W with the following thermal results:

The point at 64.1°C is the Driver.

The point at 45.6°C is one of the power mosfets from the bridge.

Are these results right? Because we expect to have more temperature at the mosfets because they have an exposed pad.

over 2 years ago

0 Joshua Horlander Cruz over 2 years ago

TI__Mastermind 24810 points

Hi Nicolas,

From the temperature recorded there is no issue with the drivers temperature as it is well under its maximum operating temperature of 150°C.

If you are concerned about the drivers temperature relative to the MOSFETs, please refer to section 3 of our Quick Guide to Debugging Common Issues in BLDC motor drivers FAQ, it should be helpful in resolving heating related issues.

Best regards,

Joshua

0 Nicolas Gabriel Rios Taurasi over 2 years ago in reply to Joshua Horlander Cruz

Prodigy 205 points

Hello Joshua

This was the same test, with the same firmware controller and the same load:

Without taking attention to the power connector thermal aport we noticed similar thermal results. The main problem is that the device will be closed inside a plastic case, this condition stress the board to a higher level of temperature, shall we be worry about that?

Thanks!

0 Joshua Horlander Cruz over 2 years ago in reply to Nicolas Gabriel Rios Taurasi

TI__Mastermind 24810 points

Hi Nicolas,

Would you mind telling me the reason that you decided to use the 1A/2A IDRIVE setting, this could be causing the heating? The MOSFET you are using has a Qgd of 7nF and with a IDRIVE of 1A the rise time is 7ns where we usually see people use rise times of 100-300ns.

Have you tried lower IDRIVE settings to see if it helps with the heating?

Best Regards,

Joshua

0 Andrew Liu over 2 years ago in reply to Nicolas Gabriel Rios Taurasi

TI__Mastermind 18981 points

Hi Nicolas,

Please let us know if the latest response has addressed your question, or if you have further information to provide so that we can further debug. If your problem has been resolved, please help mark the thread as resolved.

If further thermal performance of your system is desired, I would suggest to read the below 2 resources that we created to optimize PCB layout for high-power.

Thanks and Best Regards,
Andrew

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BOOSTXL-DRV8323RS: Custom driver board for a BLDC Motor