DRV8323R: junction temperature and BEMF problem.

Min-su Kim

Intellectual 570 points

Part Number: DRV8323R
Other Parts Discussed in Thread: TMS320F28069, DRV8323

Hi,

I have two questions.

one is the juntion temperature and the other is BEMF.

1. Juntion temperature

I developed the board with DRV8323RH and TMS320F28069. And I succeed to control BLDC motor with 6-step and SVPWM method.

VM is 50V. When I enabled the DRV8323, the juction temperature rise above 80 degree in celcius. temperature was measured by thermal camera.

Is it OK? Although the operating range is upto 120 degree in celcius, I worry about the high temperature

2. BEMF problem

I use 50V power source. If motor generate the voltage over 20V by the external force, VM might be over 70V.

In the situation, DRV8323 can operate? all other parts such as MOSFET and capacitor are 100V standard.

I want to use DRV8323 which makes the simple schematic.

Thank you.

over 7 years ago

0 Rick Duncan over 7 years ago

TI__Guru** 114905 points

Hi Min-su,

Min-su Kim said:

1. Juntion temperature

I developed the board with DRV8323RH and TMS320F28069. And I succeed to control BLDC motor with 6-step and SVPWM method.

VM is 50V. When I enabled the DRV8323, the juction temperature rise above 80 degree in celcius. temperature was measured by thermal camera.

Is it OK? Although the operating range is upto 120 degree in celcius, I worry about the high temperature

Temperatures above 80C are OK, but you should assess if this temperature rise is expected in your system. Is the increase in temperature due to the regulator , switching frequency, something else?

Min-su Kim said:

2. BEMF problem

I use 50V power source. If motor generate the voltage over 20V by the external force, VM might be over 70V.

In the situation, DRV8323 can operate?

Any voltage over the absolute maximum can damage the device.

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DRV8323R: junction temperature and BEMF problem.