DRV7308: Peak current for IGVDD,3SW

Daisuke Higa

Genius 4335 points

Part Number: DRV7308

Tool/software:

Hi support team all.

IGVDD,3SW is 6mA (typ), but is this an average value?

Could you tell me the peak current value?

My customer is estimating the power supply capacity for GVDD.

Best regards,

Higa

7 months ago

0 Anthony Lodi 7 months ago

TI__Mastermind 26546 points

Hi Higa-san,

Thanks for your question! What GVDD capacitance is the customer using and what bootstrap capacitance are they using?

Regards,

Anthony Lodi

0 Daisuke Higa 7 months ago in reply to Anthony Lodi

Genius 4335 points

Hi Lody-san

Thank you for your reply.

My customer is considering GVDD and bootstrap capacitances which based on EVM circuit.

MD042A(002)_Sch.PDF

Best regards,

Higa

0 Anthony Lodi 7 months ago in reply to Daisuke Higa

TI__Mastermind 26546 points

Thanks Higa-san!

We plan on performing some testing hopefully this week to provide information on the peak current value.

Regards,

Anthony Lodi

0 Daisuke Higa 7 months ago in reply to Anthony Lodi

Genius 4335 points

Hi Lodi-san

Thank you for your kind support.

I got it.

Best regards,

Higa

0 Anthony Lodi 7 months ago in reply to Daisuke Higa

TI__Mastermind 26546 points

Hi Higa-san,

My coworker tested this on bench and found that the primary inrush that was observed was when powering on GVDD, and it was observed that less than 160mA peak current was present during this inrush current and the vast majority of the inrush was around 130mA. This was with a 10uF and 100nF capacitor on GVDD, as well as a 3.3V and 5V LDO that was also powered from GVDD.

I hope that helps!

Regards,

Anthony Lodi

0 Daisuke Higa 7 months ago in reply to Anthony Lodi

Genius 4335 points

Hi Lody-san

Thank you for kind support.

Is the source power supply current limited to 130mA?

Regards,

Higa

+1 Anthony Lodi 7 months ago in reply to Daisuke Higa

TI__Mastermind 26546 points

Hi Higa-san,

My coworker indicated that the power supply current limit is set to 600mA. So the 130mA shouldn't be due to power supply current limiting.

Regards,

Higa-san

0 Daisuke Higa 7 months ago in reply to Anthony Lodi

Genius 4335 points

Lodi-san

Thank you for comfirming.

I understood.

Thanks!

Regards,

Higa

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DRV7308: Peak current for IGVDD,3SW