Part Number: LM5148-Q1 Other Parts Discussed in Thread: LM5148 , LM5149 Hello,
I'm currently using the LM5149-LM25149 Calculator for the LM5148 Buck Converter (as the LM5148 one's is not available).
For the buck inductance calcul, I followed the…
Part Number: LM5148-LM25148DESIGN-CALC Other Parts Discussed in Thread: LM5149 , LM5148 I would like to download LM5148-LM25148DESIGN-CALC, but visiting the download page does nothing. Could the document be uploaded here or the webpage fixed?
Hi Andrew,
The schematic looks good from a high-level.
You could maybe have an option to tie VCCX to VOUT for better efficiency.
Please double check your component values with the quickstart calculator, you can also input FET specs and estimate efficiency…
Hi David,
Can you double-check and attach LM5148 quickstart calculator?
https://www.ti.com/tool/LM5148-LM25148DESIGN-CALC
Your current sense resistor should be ~3mΩ to set a 20A peak current limit.
4mΩ set a peak current limit of 15A, where…
Hi Jean,
Are you measuring these gate drive HO and LO signals at the IC or at the FET?
What does the SW node look like when VOUT drops at 4A? Is it stable? Also is your VIN stable at that condition?
Can you attach a quickstart calculator?
https://www…
Other Parts Discussed in Thread: LM5148-Q1 , SYNC-BUCK-FET-LOSS-CALC , LM5148 Hi all,
I have used the IC " LM5148-Q1 " for the design of the buck converter, where I have calculated all the values according to the IC datasheet also verified with the support…
Hi Gareth,
Please fill out and attach LM25148 quickstart calculator.
https://www.ti.com/tool/LM5148-LM25148DESIGN-CALC
Use the quickstart calculator to recalculate compensation components.
12V output switching at 2.1MHz may see very large losses on the…
Hey Gert,
The larger gate charge on the high-side FET will slow down the switch node rise time and fall time.
Slower SW times increases switching transition losses.
Try out the quickstart calculator where you can fill in the MOSFET specs and get a estimated…
Hi Jon,
The CSD18512Q5B should work with the LM25148-Q1.
The lower RDSON should actually result in better* efficiency.
You can use WEBENCH or the LM5148-LM25148DESIGN-CALC.
For any MOSFET you definitely need to make sure the threshold voltage VGS(th)…
Hi Lina,
Soft-start is ~3ms, it should rise from 0V to 24V in that 3ms in a linear slope.
The stair step waveform of start up is not expected.
You dont have the VCC of the LM5149. Is the LM5148 VCC voltage constantly 5V?
Also, the VIN voltage should not…