LM5116: I need help using the LM5116 in PSPICE

Timothy Medina

Part Number: LM5116
Other Parts Discussed in Thread: LM5145, LM5146-Q1

Hello,

I am new to circuit design and electronics engineering so please bare with me. I am trying to understand the use of LM5116 and attempting to simulate the sample circuit given in the LM5116 datasheet. However I am not sure what to use for the "N/A" components. Do I just ignore and connect a wire there? I am also confused for TP1... does this connect back to the SYNC I/O? If I prove at Vout using OrCad PSPICE probe I should see 5V without adding a resistive load right?

Any help would be great.

over 5 years ago

0 Timothy Hegarty over 5 years ago

TI__Guru 73752 points

Helo Mr Medina,

The components marked N/A are not assembled. Resistor R5 is for MOSFET current sensing (instead of shunt current sensing using R6). Also, C7 is a cap for noise reduction (typically not required) and D2 is a diode to discharge UVLO if VIN goes low. You should see 5V at no load during normal steady-state operation.

As a side point, the LM5145 and LM5146-Q1 are our next gen controllers that provide better performance at lower cost.

Regards,

Tim

www.ti.com/widevin

0 Timothy Medina over 5 years ago in reply to Timothy Hegarty

Prodigy 90 points

Hi Tim,

Thank you for the clarification, this helps out a lot. I will look into LM5415 as a potential replacement and design improvement.

Last question, so given that N/A is not assembled. Should I just use any value in my PSPICE Simulation?

Thanks,

Tim

0 Timothy Hegarty over 5 years ago in reply to Timothy Medina

TI__Guru 73752 points

My recommendation is to leave the N/A components out of the simulation as they are not required.

Regards,

Tim

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LM5116: I need help using the LM5116 in PSPICE