LM5141-Q1: Power management forum-LM5141Q

hi, Ting, 

I would recommend to use webench for  this design, it will output all the information once you input your design.

https://webench.ti.com/power-designer/switching-regulator/create/customize?&VinMin=8&VinMax=18&O1V=5&O1I=5&base_pn=LM5141-Q1&AppType=None&Flavor=None&op_TA=30&origin=pf_panel&lang_chosen=en-US&optfactor=3&Topology=Buck&flavor=None&VoltageOption=None

Elena

the webench design set current just only set 10A， can not set 15A。and just have N-MOSFET power dissipation，haven't LM5141Q itself power dissipation。

HI Ting:

you can refer below PMP design

https://www.ti.com/tool/PMP15019

and you can also use webench or quick calculation tools for power dissipation 

https://www.ti.com.cn/tool/cn/LM5141DESIGN-CALC

Thanks

thank you。

I know LM5141 IC power dissipation is 0.04W，

and I use the inductor PN is XAL1010-472MED, calculate inductor power dissipation is P=I*I*R(DCR)=15*15*0.0057=1.2825W，Does my calculation is correct？

but How to calculate the two power Mosfet power dissipation？

---whether or not  I can use the total Power dissipation P=12V*15A*3.5%=6.3W，then minus LM5141 （0.04W），then minus inductor （1.2825W）,the left is the two Mosfet power dissipation is 6.3-0.04-1.2825=4.9775W

   so one power mosfet power dissipation is 4.9775/2=2.48875W，Does my calculation is correct？

Hi Ting,

Please complete the LM5141 quickstart calculator to review component power losses. You also need to include inductor core losses.

Regards,

Tim