Hi,
I have some problems with TPS65131 datasheet.
1. According to the datasheet, L1 and L2 are inversely proportional to the required output current. Not the larger the inductance, the more energy storage? Trouble to explain the principle.
2.Do 6.8us and 7.5us have specific meanings in the feed-forward capacitance formula? What effect does C9 and C10 have on the circuit output if they become larger or smaller?
3.According to the datasheet, when the input is 5v , the output efficiency is as high as more than 80 %. however during the actual test(input 5V, output + 15 / - 15),the efficiency is 72 % and the converter is very hot. Where can efficiency be affected? What are the ways to improve efficiency?
4.According to the datasheet, the BSW pin goes low when ENP is set high. But in practice, this pin will output a square wave, what is the case? If the switch MOS is not configured, can this bsw pin be suspended?
5. “the connections of the components connected from CN, CP, FBN and FBP to AGND is important on this component. AGND needs to be a very clean GND directly connected to the power pad to make sure the IC is able to regulate properly.” Do PGND and AGND need to be wired separately and then single - connected?
Thanks
Aaron