DRV8908-Q1: DRV8908 Output rising time

Eric Liu(SZ-FAE)

Intellectual 1590 points

Part Number: DRV8908-Q1

Hi team,

Is there any difference in rising time between the independent channel output and the parallel 2 channels output

over 1 year ago

0 Shinya Morita over 1 year ago

TI__Mastermind 44475 points

Hi,

Thank you for your question. Our expert will reply to you in a day or two.

0 Eric Liu(SZ-FAE) over 1 year ago in reply to Shinya Morita

TI__Intellectual 1590 points

Except this question, how about the slew rate difference when we use the drv8908 in dependent mode and parallel mode, will the slew rate will slower when we use the parallel mode, cause we need charge 2x Qg compared to the single channel. will the slew rate adapt to the different mode ? just like the below

setting the SR as 2.5v/us ,will the SR down to 1.25V/us when we drive two parallel channels?

0 Keerthivasan Kumanan over 1 year ago in reply to Eric Liu(SZ-FAE)

TI__Mastermind 18385 points

Hi Eric,

Can you elaborate on what you mean by this:

Eric Liu(SZ-FAE) said:
cause we need charge 2x Qg compared to the single channel

In parallel mode, the drive mechanism for the half bridges don’t change. Slew rate will still work in parallel mode.

Best,

Keerthi

0 Eric Liu(SZ-FAE) over 1 year ago in reply to Keerthivasan Kumanan

TI__Intellectual 1590 points

Hi Keerthi

Do you means that the SR will keep the setting value , no matter how many channels paralleled?

0 Jacob Thompson over 1 year ago in reply to Eric Liu(SZ-FAE)

TI__Mastermind 23421 points

Yes, it should stay the same in parallel mode as single channel mode no matter how many channels are paralleled.

Best,

Jacob

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DRV8908-Q1: DRV8908 Output rising time