Part Number: LM5145DESIGN-CALC Other Parts Discussed in Thread: LM5145 Hello team,
I have a question about LM5145 design calculator.
MOSFET loss curve doesn't change when I change Qrr value of Low side FET. Only efficiency curve is changing by the parameter…
Part Number: LM5145DESIGN-CALC dear supplier ,
I am trying to use the LM5145RGYR in our product , please help to check the design if there is any mistake or problem , if you have any question please let me know. I am looking forward to your reply, thank…
Part Number: LM5145 Other Parts Discussed in Thread: , LM25145 , LM5146 Hi,
On the LM5145 product page both tools are listed. The Excel sheet looks similar, same input boxes. But when filling the sheets with the same requirements and values, I get large…
Part Number: LM5145DESIGN-CALC Other Parts Discussed in Thread: LM5145-Q1 , LM5146 , LM5145 Hello team,
I would like to confirm below two things regarding LM5145DESIGN-CALC excel tool.
Compensate pole location Comments of Fp1 and Fp2 in excel tool says…
Part Number: LM5145DESIGN-CALC
I want to design in the case of negative output using LM5145DESIGN-CALC.
However, It seems that it can only be designed in the case of positive output .
What should I do?
I want to observe the figure of Bode-Prot, in the…
Hello,
Please use the LM5145 quickstart calculator to help with compensation design for the LM5145 https://www.ti.com/tool/LM5145DESIGN-CALC .
Also, the various transfer functions (Vout-to-COMP and COMP-to-Vout) are provided in the datasheet.
Regards…
Hi Neo,
I suspect the design is unstable - please complete the quickstart calculator to check https://www.ti.com/tool/LM5145DESIGN-CALC . Note the 22uF/25V output cap will be ~10uF at 8VDC. Set the crossover < 25kHz. what is the ESR of the electrolytic…
Hi David, please send the schematic and a completed quickstart calculator with FET part numbers.
https://www.ti.com/tool/LM5145DESIGN-CALC
Regards,
Tim
That FET has a very high Qrr of 111nC - try one with lower Qrr to improve the noise behavior, e.g. CSD18563Q5A.
See here for the quickstart: https://www.ti.com/tool/LM5145DESIGN-CALC
