Thanks for the help, I've updated the EXCEL with the correct ESR, I'm using 4 10uF low ESR ceramic cap + 1 elec 470uF, with your excel it should be around 5m Ω so i used 10 for my calcs. Now the COMP values are really strange in the LM5149 excel…
Hi Tony.
The recommended switching frequency for a 12V output is quite high with this module (to maintain a reasonable 30-50% the inductor ripple current at Vin = 24V, 36V, etc.).
However, if the Vin-max of your application is low (e.g. less than 18V…
Hi Dominykas,
Could you give me some additional design specs: Vin: 4.2V Vout: ?? Max Load: ??
Based on the feedback divider selected, the target output voltage would be below the input voltage, so the device never becomes active.
We also have a quickstart…
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…
Hi Radoslaw,
thank you for using the E2E forum.
Unfortunately we do not have a reference Design available for that power and voltage ratings but you can work with the Quickstart calculator ( https://www.ti.com/tool/download/LM51772-QUICKSTART-CALC )
to…
Hi Abhishek,
I recommend using the LM25143 quickstart calculator: https://www.ti.com/tool/LM5143DESIGN-CALC
Set Vout = 20V first and derate the ceramic output capacitance accordingly. Then fix the compensation values and check the loop with Vout =…
Part Number: LM5017
Hello TI,
A. Kindly reply to the related thread https://e2e.ti.com/support/power-management/f/196/t/783364
B. LM5017 flybuck transformer xlsx, Air gap calculation Cells I29 & I33, use complex equation comprising of Centre leg length…
Hi Malakondareddy,
Can you send more specifics of the circuit you're trying to simulate - Vin range, Vout, Iout, Fsw - and I will try it. As an alternative, please refer to the LM25149 quickstart calculator https://www.ti.com/tool/LM5149-LM25149DESIGN…
Hi Nicolas,
I suspect you have huge inductor core loss and/or FET switching loss.
Send on a completed quickstart calculator file so we can examine the power losses: https://www.ti.com/tool/LM5146DESIGN-CALC
PS: given the max Vin of 58V, the LM5145…
Hi Mohsin,
It's good practice to fill out the quickstart calculator for your design https://www.ti.com/tool/LM63460-LM64460DESIGN-CALC .
Note that 1.2uH seems high here. We use a 0.76uH in the EVM, and that's for a 5V output. You may use 0.47uH or…