KB,
Hi KB, are you referring to the datasheet image?
The LM5148 is the same DC/DC controller as LM5149, where LM5149 uses Active EMI filtering in place of the NC pins.
However without active emi filter the devices are the same.
That datasheet references…
Hi Lei,
What does your schematic and layout look like? Did you route the current sense signals internally and away from noise sources?
Are you able to add a current sense filter?
Reference the EVM:
https://www.ti.com/tool/LM25149-Q1EVM-2100
Let me know…
Mark,
It's fairly reasonable, even 2.2W could be a bit much, when comparing to the results from the default quickstart calculator.
By the way, the LM5149 quickstart calculator is meant to model the LM25149-Q1EVM-2100, and that EVM user guide has a…
Hi Timothy Hegarty
1.May I know why you suggest 4-phase implementation?
(Cause I see LM5143 Vo could support 55V & Io could support 100A, It is 5kW that could support customer spec 4kW)
2. Our LM5143-Q1EVM-2100 is dual channel, snva870 is 4-phase implementation…
Part Number: LM5146 Other Parts Discussed in Thread: LM5143 , LM5149-Q1 , LM5148-Q1 , LM5149-Q1EVM-400 Hi Timothy,
In addition to relative thread, can you explain a bit about why LM5146's voltage mode control is inappropriate for 2-ph interleaving operation…
Hello,
Your switching frequency is coming in correct, however the early HO termination in FPWM should not be happening.
Right now your FPWM looks like DEM, which implies that the device may think current limit is being hit.
Also note the device starts…
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…
You can try using LM25149 or LM25148-Q1, these device can fold-back frequency during dropout conditions and achieve close to 100% duty cycle.
Also LM25149 and 8 have lower Input current IQ compared to LM25116, which will result in higher efficiency.
…
Part Number: LM25148-Q1 Other Parts Discussed in Thread: CSD18511Q5A , LM25149-Q1EVM-2100 , CSD18503Q5A , LM25148 , LM25149 , LM25149-Q1 Hi team,
As the title, could you kindly tell me what is the requirement of MOS? Do we have some recommended mos? Thanks…
Hi Anne,
EMC is specific to components selected and layout.
See the EVM https://www.ti.com/tool/LM25149-Q1EVM-2100 , the EMI results for that board are published in the User Guide.
Thanks,
-Orlando
