TPS6594-Q1: Usage guideline of Simplis model

Suman Biswas

Part Number: TPS6594-Q1

Tool/software:

As per the model provided, we are able to simulate only 4 phase together, but as per our design we need separate bode plots for individual phases. Please provide the guideline to do separately.

2 months ago

0 Jari Niemela13 2 months ago

TI__Genius 13850 points

Hi Suman,

Model default setting is only one phase is used for simulation. You can check this under F11 window. Even if schematic shows all 4 BUCKs connected those 3 are not used for simulation since "phasecount=1" variable is set to single. Also to note since all BUCKs in TPS6594-Q1 are same simulation will always use same BUCK1 for single phase simulations.

By running default config you will only see one inductor current present when phasecount=1.

Br, Jari

0 Suman Biswas 2 months ago in reply to Jari Niemela13

Prodigy 40 points

in case if Gain margin is coming as error as shown below,

Does this mean Unstable system?

0 Jari Niemela13 2 months ago in reply to Suman Biswas

TI__Genius 13850 points

Hi Suman,

Please see explanation of gain margin.
In your simulation phase is not exceeding -180 (or 0 degree in Simplis simulation case) turn so with given 1MHz bandwidth gain margin is not seen yet to measure.

0 Suman Biswas 2 months ago in reply to Jari Niemela13

Prodigy 40 points

So the Error coming does to indicate to an unstable design? it can be stable also?
And how to get the gain Margin in case if I want to calculate? Do i have to increase the bandwidth then how?

0 Jari Niemela13 2 months ago in reply to Suman Biswas

TI__Genius 13850 points

Hi Suman,

Error is not necessarily indicating unstable design. It is just calculation from waveforms simulated. You would need to increase bandwidth but for any PMIC 1MHz is a lot.

For any usage instructions i would recommend to turn to Simplis software support.

Br, Jari

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TPS6594-Q1: Usage guideline of Simplis model