Part Number: LM5017 couple of queries before attempting isolated multi-outputs with LM5017
* Given VINmin =16v & IVSEC1 =15v, IVSEC2 =2.5v, IVSEC3 = minus 5v each @30mA , does it make sense to start design with non-isolated VPRI = 10v targeting isolated…
Hi Figo,
Please attach a quickstart calculator for this design:
https://www.ti.com/tool/LM5143DESIGN-CALC
This is important for us to understand your required specifications.
-Orlando
Pavan,
Please attach a quickstart calculator.
https://www.ti.com/tool/LM5146DESIGN-CALC
It is likely your compensation components are not optimized.
You need to optimize compensation components for your output capacitance as well, use the derated output…
Lumina,
Please input your MOSFET specs into the quickstart calculator. This will give an estimate of of power losses.
https://www.ti.com/tool/LM5146DESIGN-CALC
The MOSFETs are expected to heat up based on their power dissipation.
The high-side MOSFET…
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…
Hi Guohai,
The Fc crossover frequency is selected, usually between 1/10-1/5 of switching frequency.
The output capacitance is usually selected by other parameters, such as output ripple or transient response.
CBW is fixed. Fesr is calculated by the ESR…
Hi Patel,
Pls check the circuit with LM5017 calculation tool:
https://www.ti.com/tool/LM5017-QUICKSTART-CALC
Seems Cff is not required if Cout has big ESR
the layout is not clear, pls upload 2D image.
B R
Andy
Hello Humphrey,
For testing I would remove first the 10 ohm gate resistors and replace them with 0 ohm.
At the first glance, the schematic seems to be ok, but I did not find the time to fill in the quickstart calculator today: Here you can find it, to…
Hello,
Are you in FPWM mode?
Is the device switching stable? Can you probe the inductor current and SW node voltage?
Also please use the quickstart calculator:
https://www.ti.com/tool/LM5146DESIGN-CALC
-Orlando
Hi Zhang,
thank you for using the E2E forum.
Can you please fill out the quickstart calculator which can be found on the product page with your design data and attach it here as well.
https://www.ti.com/tool/LM5175QUICKSTART-CALC
Best regards,
Stefan …