Part Number: LM5017-QUICKSTART-CALC Other Parts Discussed in Thread: LM5017 Is it possible some error in calculating Vout in the spreadsheet has gone undetected? Sometimes, the col for Vout will be wrong and in white so one cannot correct that.
An interesting…
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: LM5143DESIGN-CALC Other Parts Discussed in Thread: LM5143-Q1 Hi, Team,
Please let me confirm about "Effiency/Power Loss Analyzer shown in IM5143-Q1 Quickstart Design Tool. In the section of "Effiency/Power Loss Analyzer" in the file,…
Hi Bob,
Apologies for the delay.
Here are some comments:
You may want to use different high-side and low-side FETs (depending on Vin, Vout and where optimization should occur in the Vin range). Use the quickstart calculator in tandem with the NexFET…
Hi Ryan,
the losses of the Buck low side MOSFET can be calculated with:
P_switch.loss = 2 * Deadtime * Fsw * Vsd * I_Out
Deadtime can be set to 50ns
Vsd = Forward Voltage of MOSFET Body diode
I may also use the Quickstart calculator which lets you set…
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 Akhil,
can you please fill the design details and the MOSFET parameters into the quickstart calculator:
https://www.ti.com/tool/download/LM5175QUICKSTART-CALC
and share it here.
Can you also share the schematic.
Please let me also know what you had…
Hi Jeff,
there is a range for the inductor value to choose and this can be then selected based on the application requirement.
A larger inductor value typically has bigger size, maybe higher cost but less ripple current therefore less core losses.
Based…
MJ,
Please fill out and attach a quickstart calculator.
https://www.ti.com/tool/LM5146DESIGN-CALC
Be sure to tie SYNCIN to VCC or GND to configure FPWM or Diode emulation.
Hope this helps,
-Orlando
Hi Joscha,
the LM51772 will fit very well but input range is limited to 55V. The LM5177 can be used as well which will also allow higher input voltages but for that device the output voltage control needs to be done externally.
Due the the large about…