Dear Teams,
We use MPQ4263 to output 20V/5A for USB Type-C charge application. Now we need to do the worst case calculation, so could you share me how to calculate the power loss of buck-boost MPQ4263.
Thanks!
You might want to consider measuring it. Loss is complicated. What inductor do you use? How much stray capacitance does your layout have at the switch nodes? Trace resistance?
Hello,
jshannon would be correct as in terms of getting the exact loss for your system, measurements would be the most accurate method in terms of measuring loss.
However, it is also worth noting the loss equations as mentioned in the MPQ4263 datasheet. Since I am not sure as to what your source would be, there are loss equations for Buck mode and Boost mode respectively. They are provided below as approximations for what losses are to be expected:
Buck Mode Ploss (page 39):
Boost Mode Ploss (page 38 and 39):
Hi jshannon,
We use components as same as EVF52000-4263-R-00C. We want to calculate the power loss of MPQ4263 itself.
Thanks!
Hi Krishan,
Thanks for you replay.
Yes, we will do the power consumption test when the sample is ready, but we want to evaluate the power loss when we design the schematic. The power loss calculation of inductor, SWA, SWD, input and output capacitors have been completed, so we want to know how to calculate the power loss of MPQ4263 itself.
Thanks!
Thanks for the added details!
For loss equations of the IC by itself, the datasheet specifies this as a function of temperatures with the following equation:
PD (MAX) = (TJ(MAX) - TA) / θJA
Where the variables represent the following:
(Ambient Thermal Resistance) θJA = 39.1 degrees Celsius Watt for a QFN-20 (3mm x 5mm)
(Junction Temperature) TJ(MAX) = 150 degrees Celsius
(Ambient Temperature) TA = Any Ambient Temperature