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
Hi Venu,
Send on a completed quickstart calcualtor file (this is a critical file in circuit design, particularly to understand bode plot, power losses, etc.) https://www.ti.com/tool/LM5145DESIGN-CALC . Also, let's review the PCB layout -- see app note…
Part Number: LM5145DESIGN-CALC Other Parts Discussed in Thread: LM5145 A new project needs to output 15v10a for 24V power input. LM5145 is considered.
The design is shown in the figure below.
Q1 is burnt out when it is designed and used.
After Q1, Q2 and…
Hello Venu,
Can you check VCC if this comes up? It maybe the IC got damaged and recommend replacing and retrying. I hope the issue, if you are still facing problems, then please reopen this thread, please fil out the calculator sheet to help me understand…
Kazuya,
Please attach the schematic of their design.
Also quickstart calculator will be useful to fill out and attach. https://www.ti.com/tool/LM5145DESIGN-CALC
Please confirm the output capacitors and compensation components dont vary much over temperature…
Hello Terry,
For applications where Duty cycle is low, suggest using dissimilar MOSFETs, this is because HS MOSFETs with low duty can sacrifice RDSon for lower gate charge, lower gate charge in the HS MOSFET will result in lower switching losses. For…
Jakub,
See appnote on adjusting output voltage on-the-fly.
https://www.ti.com/lit/an/slyt777/slyt777.pdf
You can use the quickstart calculator to aid with design and component selection.
https://www.ti.com/tool/LM5145DESIGN-CALC
Hope this helps,
-Orl…
Uchikoshi,
Yes I believe so.
For optimal operation the inductor and compensation component values should have to be updated for stability.
Check the design with https://www.ti.com/tool/LM5145DESIGN-CALC
-Orlando
Hello,
Can you please fill out the LM5145DESIGN-CALC tool to help with the schematic review?
The excel spreadsheet can be found on the design tools simulation tab ( https://www.ti.com/product/LM5145#design-tools-simulation )
Regards,
Jimmy
Hi CSC,
The COMP network is still absolutely necessary for operation.
You can use the DAC to dynamically adjust the output voltage.
See figure 8 and equation 4 in https://www.ti.com/lit/an/slyt777/slyt777.pdf
Also why are you using parallel inductors? …