Part Number: PMP9053
Hi all,
I tried to follow the power supply reference designs, PMP 9053 and PMP 9608. These two designs are very similar. PMP 9053 outputs 3.3V while PMP 9608 outputs +-3.3V. However, I found the diodes used for PIN 1 and 2 of transformers are different in these two reference design (D4 D6 in PMP 9053, D2, D3 in PMP 9608). I am using the diodes in PMP9608 design. Their reverse voltages are lower than them in PMP9053.
Right now, UCC28910D cannot start up in my circuit (it might be broken, too) because the frequency of DRAIN (PIN8 of UCC28910) is only 15Hz. I double checked the connections and orientation of the diodes. Is it possible that the problem might be caused by the diodes I selected. Does anyone help me understand the functions of these two diodes and how to select the diodes for this circuits?
Meanwhile, I am not sure what the frequency of the voltage from DRAIN (PIN8) should be under the working condition and how this frequency is controlled?
Thanks.