LM51561: IOPERATIING(BIAS)

Kuramochi Tadahiko

Guru 28715 points

Part Number: LM51561

Hi,

Is the IOPERATIING(BIAS) included gate drive current?

Best Regards,

Kuramochi

over 2 years ago

0 EM over 2 years ago

TI__Genius 11215 points

Hello Kuramochi,

Thanks for reaching out. In the Ibias current, the bias to the VCC LDO and therefore the gate driver current is included.

Kind regards,

Elisabetta

0 Kuramochi Tadahiko over 2 years ago in reply to EM

Guru 28715 points

Hi Elisabetta-san,

Thank you for your reply.

Which schematic is the Ibias current measured?

Best Regards,

Kuramochi

0 EM over 2 years ago in reply to Kuramochi Tadahiko

TI__Genius 11215 points

Hi Kuramochi,

This current is measured in open loop (and no switching activity).

Kind regards,

Elisabetta

0 Kuramochi Tadahiko over 2 years ago in reply to EM

Guru 28715 points

Elisabetta-san,

Does "open loop" mean that GATE pin is floating?

Best Regards,

Kuramochi

0 EM over 2 years ago in reply to Kuramochi Tadahiko

TI__Genius 11215 points

Hi Kuramochi,

No, the pin is not left floating, it is connected to the switch.

Kind regards,

Elisabetta

0 Kuramochi Tadahiko over 2 years ago in reply to EM

Guru 28715 points

Hi Elisabetta-san,

Does the switch mean FET?

Is the current flow into the switch?

Best Regards,

Kuramochi

+1 EM over 2 years ago in reply to Kuramochi Tadahiko

TI__Genius 11215 points

Hi Kuramochi,

Yes, the switch means the FET. In this case, since there is no switching activity, there is also no current provided by the power stage to the load. The bias current is only biasing the LDO and the driver.

Kind regards,

Elisabetta

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LM51561: IOPERATIING(BIAS)