TINA/Spice/CSD18534Q5A: Is the web provided Pspice model correct? is it the same as CSD18543Q3A other than the size?

Terri Wang

Part Number: CSD18534Q5A
Other Parts Discussed in Thread: TINA-TI, CSD18543Q3A, , CSD18540Q5B

Tool/software: TINA-TI or Spice Models

We were originally using the MOSFET CSD18543Q3A in parallel with LMS3406 for the fast dimming application for LED control. The simulation works fine. On the drain side, when the MosFET gate voltage low, its Drain side will go as high as 48 V which was from the Vout of LMS3406. Now we changed the MOSFET into the CSD18534Q5A thinking of it has the same functionality as the CSD18543Q3A, yet has better power dissipation with larger package. Yet with this bigger size MOSFET in place, its drain-voltage stays at low, it has completely different behavior compared with the CSD18543Q3A. I lost the 48V output. Why? Is the PSpice model for CSD18534Q5A correct? I downloaded from the TI website.http://www.ti.com/product/CSD18534Q5A/toolssoftware.

Any help?

Thanks,

Terri

over 5 years ago

0 Chris Bull over 5 years ago

TI__Expert 6865 points

Terri,

Thanks for posting, the spice model is correct as far as I know. So this may be something else in the system. Our apps person will be contacting you shortly.

0 Ankan De over 5 years ago

TI__Prodigy 160 points

Hi Terri,

The model seems to work in our internal test bench. We verified the turn on and turn off transients for a DC/DC converter. This may be a system based issue.

Thanks,
Ankan De

0 Terri Wang over 5 years ago in reply to Ankan De

Prodigy 160 points

This chip doesn't work in my OrCAD/PSpice simulation, yet its cousin CSD18543Q3A works perfectly fine in the same circuitry. That is why I suspected the Pspice model that came with this chip not correct. So should I use the CSD18540Q5B instead?

Thanks,

Terri

0 Ankan De over 5 years ago in reply to Terri Wang

TI__Prodigy 160 points

Hi Terri,

Yes, please check if CSD18540Q5B works in your system.

If you can provide us a snapshot of your schematic, we can try and recreate that here and verify the operation of CSD18534Q5A.

Thanks,
Ankan

0 Terri Wang over 5 years ago in reply to Ankan De

Prodigy 160 points

Thanks, I've checked the CSD18540Q5B works in the our system by plugging it into the circuit without changing any parameters. We will go ahead using this one.

Thanks,

Terri

Power management

Power management forum

TINA/Spice/CSD18534Q5A: Is the web provided Pspice model correct? is it the same as CSD18543Q3A other than the size?