UCC27516: Input bias current at 12V

Sonia Dupuch

Part Number: UCC27516

What is the input bias current at 12V into the IN+ pin. Is this purely the pull down resistor or is there further leakage into the pin logic?

over 1 year ago

0 Rubas Khalid over 1 year ago

TI__Expert 8640 points

Hi Sonia,

The IN+ bias current is just the pull-down resistor. Per datasheet, the supply current includes the sum of quiescent current, average Iout current from switching, and current related to pullup resistors on an unused pin.

Thanks,

Rubas

0 Sonia Dupuch over 1 year ago in reply to Rubas Khalid

Prodigy 20 points

Thank you, Rubas,

Part UCC27516 is not being used in in a continuous switching application. Consequently, any quiescent current is very critical.

We are expecting some kind of bias current, even though very small. Could you please confirm the value of this bias current?

With kind regards,

Sonia

0 Rubas Khalid over 1 year ago in reply to Sonia Dupuch

TI__Expert 8640 points

Hi Sonia,

Any stray bias current in the IN+ pin that may exist is very negligible, as the pull-down resistor heavily dominates it. It's to the point where a slight variation in the resistor value has a larger impact on current than those stray bias currents. Please let me know if this helps.

Thanks,

Rubas

0 Sonia Dupuch over 1 year ago in reply to Rubas Khalid

Prodigy 20 points

Thank you Rubas,

Would it be possible to get an indication of the value of that bias current? Is it in the order of 5 to 10uA? or lower?

Thank you very much,

Sonia

0 Rubas Khalid over 1 year ago in reply to Sonia Dupuch

TI__Expert 8640 points

Hi Sonia,

It's on the order of nanoamps, less than 100nA.

Thanks,

Rubas

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UCC27516: Input bias current at 12V