Part Number: LM5140ADESIGN-CALC Other Parts Discussed in Thread: LM5143-Q1 , LM5140-Q1 Hi Experts,
the LM5140ADESIGN-CALC seem to always recommend the same FET. Even when Vin is exceeding the max voltage of the IPC50N04. Is there an issue or is this…
Part Number: LM5140ADESIGN-CALC Hi Team,
When trying to modify the "inductor DCR" box, Excel prompted me to enter a password.
Could you provide me with the password?
Thanks!
Roy Hsu
Hi Kiyoshi-san,
The expression to derive the SS cap isbased on 20uA charging the cap to 1.2V. You can use the quickstart calculator as well: https://www.ti.com/tool/LM5140ADESIGN-CALC .
Regards,
Tim
Looks like something is shutting down when the 3.3V channel is enabled. Can you verify that the 12V input supply is not hitting current limit and that VCC is steady at 5V.
Can you please complete the quickstart file here: https://www.ti.com/tool/LM5140ADESIGN…
Hi,
You may be able to use the design calculator listed below.
It gives you an approximation based on the component selection that you use
https://www.ti.com/tool/LM5140ADESIGN-CALC
Thanks
-Arief
Hi,
What are your input voltage and target working conditions? Please use the below quick start tool with your inputs. For output voltage ripple I still recommend to use simulator because it's related to the actual output capacitance.
www.ti.com/…
Part Number: LM5140-Q1 Other Parts Discussed in Thread: LM5140ADESIGN-CALC , LM5143-Q1 , Hi Team,
1. When using this device in the interleaved mode, how do I calculate Rcomp and Ccomp?
Cout - Should I use the total capacitance on both phases?
Rsense…
HI
yes, LM5140-Q1 can support this applicaiton, but need set a 400Khz freqeuency with good thermal disspaiton way for the mosfet.
suggest you use the quick caculation tools for the schematic component value cacultion and efficiency estimation .
…
Hi Zhi,
These EPC FETs are sensitive to gate overvoltage. I recommend putting a 5.1V Zener across each boot cap. Also, you will likely need an antiparallel Schottky from GND to SW of each channel as the GaN FET does not have a body diode (causing…
