TPSM843B22: Output Imedance Data and Model Tolerancing

Anthony Flores

Prodigy 50 points

Part Number: TPSM843B22

Tool/software:

Hi,

I was wondering if there is any output impedance data for the TPSM843B22?

Also, is the simplis model toleranced at all?

5 months ago

0 Ryan Chen 5 months ago

TI__Expert 8846 points

Hi Anthony,

We have some measurements, but they are in bode3 document file types. Do you have Bode Analyzer Suite? It is free to download here: Bode Analyzer Suite - control your Bode 100 | OMICRON Lab (omicron-lab.com)
The SIMPLIS models are programmed to simulate the same way every time, there are ways to test the min/max results, but this is not something that is included in the model.

Best,

Ryan

0 Anthony Flores 5 months ago in reply to Ryan Chen

Prodigy 50 points

Yes, bode3 file works for me. Where can I find the files?

0 Ryan Chen 5 months ago in reply to Anthony Flores

TI__Expert 8846 points

Hi Anthony,

We have data for 500 kHz, 750 kHz, 1 MHz, 1.5 MHz at no load, 5A and 20 A at different ramp settings.

TPSM843B22 impedance 12 Vin, 1 Vout, 1 MHz measurements.bode3 TPSM843B22 impedance 12 Vin, 1 Vout, 1.5 MHz measurements.bode3 TPSM843B22 impedance 12 Vin, 1 Vout, 500 kHz measurements.bode3 TPSM843B22 impedance 12 Vin, 1 Vout, 750 kHz measurements.bode3

Best,

Ryan

0 Anthony Flores 5 months ago in reply to Ryan Chen

Prodigy 50 points

Thank you!

Is the measurement setup the same as in the EVM board?

0 Ryan Chen 5 months ago in reply to Anthony Flores

TI__Expert 8846 points

Hi Anthony,

Here is a pdf explaining how to take the measurement: Picotest 2-port Probe Impedance Measurements - Picotest

It requires a P2102A Probe, J2113A Differential Amplifier, and Bode 100 analyzer. Also, moving one of the output capacitors to create an open pad is needed.

Best,

Ryan

0 Anthony Flores 5 months ago in reply to Ryan Chen

Prodigy 50 points

I am trying to correlate the impedance plot from SIMPLIS with the measured data you have sent. Can you please provide the components used in the test circuit so that I may match them in the SIMPLIS simulation?

0 Ryan Chen 5 months ago in reply to Anthony Flores

TI__Expert 8846 points

Hi Anthony,

The components used were an unmodified TPSM843B22EVM, its schematic can be found on the user guide.

TPSM843B22EVM Step-Down Module Evaluation Module User's Guide

Best

Ryan

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TPSM843B22: Output Imedance Data and Model Tolerancing