TLV3544: TLV3544

Ian Wang

Mastermind 25845 points

Part Number: TLV3544

Hi Sir,

Customer using TLV3544 but found o/p waveform is not perfect,

They found pin resistance are a little bit different, would you pls check if impedance will cause worse waveform?

TLV3544 量測數據資料.xlsx

Thanks, Ian.

over 1 year ago

0 kai klaas69 over 1 year ago

Guru 140200 points

Hi Ian,

usually, such resistance measurements are not very meaningful.

It looks like the output is driven into hard saturation? Please note that no OPAmp can linearily operate at its output all the way down to 0V. See the measuring condition of the "open-loop gain" specificatcion in the datasheet.

Please show us a schematic and tell us more about the application (input voltage signal, load, etc.)

Kai

0 Ian Wang over 1 year ago in reply to kai klaas69

TI__Mastermind 25845 points

Hi Kai,

Here is schematic as attach, thanks.

OPA4354_TLV3544-Schematic.zip

0 Alec Saebeler over 1 year ago in reply to Ian Wang

TI__Genius 12735 points

Hello Ian,

Thank you for sharing a schematic. I will take a look and add a reply with any additional questions I may have.

Best,

Alec

0 kai klaas69 over 1 year ago in reply to Ian Wang

Guru 140200 points

Hi Ian,

L1, L2 and L3 destabilize the circuit. And directly connecting Q1 without isolation resistor will additionally destabilize the circuit:

Omitting the inductance and Inserting an 47R isolation resistor will help:

ian_opa4354.TSC

Please carry out a phase stability analysis of the other OPAmp circuits as well.

Kai

0 Alec Saebeler over 1 year ago in reply to kai klaas69

TI__Genius 12735 points

Hello Ian,

If you run into trouble performing stability analyses on your circuit, please let us known in this forum. We can advise you and walk you through the process.

Best,

Alec

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TLV3544: TLV3544