The card was manufactured and soldered already, but the chips of tpsm63606 are very hot after several minutes? I have used 3 pcs tpsm63606, is it too much?
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hi for -15V,
you need to set the frequency between 1.8-2.2Mhz, and cause the actual mosfet voltage rating is input + output, so it is around 35V , the max output current is around 3A. the mosfet is very close to its max voltage, so I think it is the reason for module is hot, and by the way, do you give the module enough copper for thermal dissipation?
RT is replaced with 6.2Kohm resistor and the heat is still there. This afternoon, I just enabled -15V output, When Input is 19V, it is still very hot. It is obvious that -15V generate the heat. I changed the input to 15V, 12V,10V, the output is still -15V. But when I changed the input to 9V, it didn't output -15V, only 600mV. Anything is wrong?, the schematic is attached, please check it. Is there any error in the schematic?Powercard V301.pdf
I did some wenbench estimation, it looks in very light load, the silicon still have 1.14W, I think it is due the inductor and switching loss in high input voltage.
pls notice this condition is 35Vin 15Vo Io=0.1A buck , the inner mosfet and inductor will have same voltage and current stress as 20Vin -15Vo 0.05A inverting buck boost condition