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TPS543320: Problem with PSpice simulation

Goran Fiolic
Intellectual 410 points
Part Number: TPS543320

Hi,

I am trying to simulate TPS543320 based power supply design but I am constantly getting the following error:

ERROR(ORPSIM-16550): Floating point computation failed during matrix solution. Possible solutions: 1)Ensure that all device parameters are in valid range. 2)Try using .options LIMIT

Below is my circuit:

V12 1 0 12.00
Ven 5 0 PWL (0us, 0) (20us, 5) (20ms, 5)

Rvin 1 2 0.10
Rcin1 2 3 5.00m
Rfsel 6 0 8.06k
Rmode 7 0 174.00k
Rpg 9 10 10.00k
Rfbh 15 11 10.00k
Rfbl 11 0 10.00k
Rcout1 15 16 1.00m
Rcout2 15 17 1.00m

L1 14 15 1.50u

Cin1 3 0 22.00u
Cbp5 10 0 2.20u
Cfb 15 11 39.00p
Cboot 13 12 100.00n
Cout1 16 0 39.00u
Cout2 17 0 39.00u

XU1 6 0 11 2 5 9 7 10 14 13 12 0 0 2 TPS543320_TRANS

RL 15 0 1.00

* SYNC_FSEL PGND_0 FB VIN_1 EN PGOOD MODE BP5 SW_0 SW_1 BOOT AGND PGND_1 VIN_0
* 6 0 11 2 5 9 7 10 14 13 12 0 0 2

.TRAN 20ns 3ms 0ms 20ns

I can't see any obvious error so I would need some help on this. Also, which SW pin has to be connected to inductor - SW_0 or SW_1? When I started simulation for the first time I got message that .subckt name does not match .ends name. Problem was here:

.subckt D2A_CONVERTER_9Bout d0 d1 d2 d3 d4 d5 d6 d7 d8 ref PARAMS: THRESH=0.5
.ends D2A_CONVERTER_9B

I guessed that correct syntax would be:

.subckt D2A_CONVERTER_9B out d0 d1 d2 d3 d4 d5 d6 d7 d8 ref PARAMS: THRESH=0.5
.ends D2A_CONVERTER_9B

Is this right or wrong?

Regards

Goran

  • 0
    TI__Genius 9460 points

    Hi,

    Nancy will help support this soon.

    BRs

    Lucia

  • 0
    TI__Mastermind 45230 points

    Hi Goran,

     For your model, I have below comments:

    1. Why do you use Ven 5? Is this 5V power supply for BP5? BP5 is internal 5V output and just need a 2.2uF bypass cap.

    2. Did you try to use TI PSpice mode to run your simulation? I think TI PSpice mode has a wrong connection on SW pin10 and pin13. SW pin10 should be connected to output inductor and SW pin13 should be connected to bootstrap cap. Please refer to datasheet for correct connection. I will report this connection issue to TI model team.

    Hope this helps to solve your problem.

    Thanks,

    Nancy