Can confirm that the UCC12050 has a power dissipation of 385 mW with only 50 mA of current load (Iiso) ?
Below my technical analisys.
The following table is taken from datasheet of UCC12050, Power Ratings
Defining Pboard the board power consumption, Pload the load dissipation power and Pucc the power dissipation of UCC than :
Pboard = Pload + Pucc
If ɳ is the efficiency of DC-DC converter than
Pboard = Viso x Iiso + (1-ɳ) x Pboard
When Iiso = 135mA, with Viso = 3.3Vdc then Pload = 445.5 mW and ɳ = 50% (full load in Figure 6-14)
In my case with a load current of 50mA the efficiency of ICC12050 is less of 30%
Therefore
Pload = 0.05 x 3.3 = 165 mW,
Pboard = Pload/ ɳ = 0.165/0.3 = 550mW,
Pucc = Pboard – Pload = 0.550 – 0.165 = 385 mW
How can improve the efficiency of UCC12050 ?
