TLV9051: Output Capacitance

Mark Ackerson

Genius 10190 points

Part Number: TLV9051

Customer is using TLV9051 in the configuration shown below.

Any concerns with the 1 uF output capacitor? We understand it is more than recommended in the data sheet.

Thanks,
Mark

over 2 years ago

0 Tim Claycomb over 2 years ago

TI__Genius 15410 points

Hi Mark,

This will cause severe stability issues. An op amp cannot directly drive 1uF. This capacitor must be removed or an isolation resistor must be added. I recommend taking a look at our TI Precision Lab Videos on Stability.

Thank you,

Tim Claycomb

0 Mark Ackerson over 2 years ago in reply to Tim Claycomb

TI__Genius 10190 points

Hi Tim,

Agreed, thank you.

Regards,
Mark

0 kai klaas69 over 2 years ago

Guru 140200 points

Hi Mark,

using the dual feedback method results in a comfortable phase margin of 85°

mark_tlv9052.TSC

Kai

0 Mark Ackerson over 2 years ago in reply to kai klaas69

TI__Genius 10190 points

Hi Kai,

Thanks for the suggestion. The customer was basically implementing a voltage regulator so we suggested an LDO. That is what they decided to use.

Regards,
Mark

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TLV9051: Output Capacitance