LM5642: PSpice model

Alfred Logico

Part Number: LM5642
Other Parts Discussed in Thread: LM5143, LM25119

Hi Team,

Good day!

One of my customers is asking if we have a Pspice model for our LM5642 for their simulation of their application. Do we possibly have one?

Thanks!

BR,

Alfred

over 2 years ago

0 Timothy Hegarty over 2 years ago

TI__Mastermind 49647 points

Hi Alfred,

I doubt we have a PSPICE model for the LM5642 as it's not in the product folder. If this is for a new design, I recommend going with the LM5143 controller.

Regards,

Tim

0 Alfred Logico over 2 years ago in reply to Timothy Hegarty

TI__Expert 4220 points

Hi Timothy,

Thanks for the recommendation. I notice the LM5143 we have online is Q1 automotive grade. Do we have any commercial grade optio coming up for this? Or do you have any recommendation that is for commercial grade? My concern is the price since the LM5143 is more expensive.

Thanks!

BR,

Alfred

+1 Timothy Hegarty over 2 years ago in reply to Alfred Logico

TI__Mastermind 49647 points

Yes, we have commercial grade coming - please contact our marketing team for more detail. LM(2)5119 is another option here.

0 Alfred Logico over 2 years ago in reply to Timothy Hegarty

TI__Expert 4220 points

Hi Timothy,

Great! Thanks for the feedback. Will reach out to them.

BR,

Alfred

0 Timothy Hegarty over 2 years ago in reply to Alfred Logico

TI__Mastermind 49647 points

Thanks, Alfred.

0 Alfred Logico over 2 years ago in reply to Timothy Hegarty

TI__Expert 4220 points

Hi Timothy,

Follow-up question, can the LM5143 or LM25119 can support dynamic output voltages? Customer application for the LM5642 is one of the outputs is used to supply 5V, 9V, 15V, and 20V for PD application. While the other is for a fixed 5V output. Just want to confirm if the proposals can work for this as well? The input voltage is 24V.

Thanks!

BR,

Alfred

0 Timothy Hegarty over 2 years ago in reply to Alfred Logico

TI__Mastermind 49647 points

Hi Alfred,

Shouldn't be a problem to dynamically adjust the output voltage for a PD application. One technique is to inject a current into FB to adjust VOUT as needed. This can be with a PWM signal from an MCU averaged by an RC filter to create a DC voltage this is resistively coupled to FB.

Alternatively, just use switches to adjust the effective lower FB resistance as needed.

Regards,

Tim

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LM5642: PSpice model