DRV8320: Thermal and power dissipation

Brian Wang0928

Part Number: DRV8320

Customer using DRV8320H with 8KHz switching freq, the case temperature of the device is about 70-degree. However, when switching freq is increased up to 50KHz. The case temp goes up to 100degree above, it violating the design temp limit.

1. How to improve it and keep 50KHz?

2. Is there any simulator to calculate the power dissipation of the DRV8320H?

3. Is DRV8320H suited with this application? What other suited device is suggested?

application: 36V DC Bus Screw Driver

Power: 150W,avg

Regards,

Brian

over 5 years ago

0 Adam Sidelsky over 5 years ago

TI__Guru 61380 points

Brian,

I am working on this and will get back to you tomorrow.

Regards,

-Adam

0 Adam Sidelsky over 5 years ago in reply to Adam Sidelsky

TI__Guru 61380 points

Brian,

We don't expect this temperature rise, the datasheet allows for up to 200kHz input signals so we should be fine here.

One thing I have been recommended to check, sometimes the iDrive can cause overshoot on the GHx and GLx pins when the setting is incorrect. This overshoot can become worse or cause more issues once the input frequency is increased. The issue might be there at lower frequency as well but we didn't see it on your system until now.

Can you ask the customer to send us some scope images of the GLx and GHx pins of one or two of the motor phases while it is operating at the lower input frequency and the higher frequency?

This should help us debug.

Regards,

-Adam

0 Adam Sidelsky over 5 years ago in reply to Adam Sidelsky

TI__Guru 61380 points

Brian,

I am assuming this was resolved and will close the thread, please post again if you need more help.

Regards,

-Adam

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DRV8320: Thermal and power dissipation