Part Number: PMP41009 Tool/software: Hi Linda,
When the VDD voltage reaches the opening threshold, is there necessarily three pulse detection failures?
Sometimes I can only detect one or two or four pulses and then it stop working. What might be the…
Hi Shilin,
Sorry for the late reply. The clamp voltage VC 414V is tested at the peak maximum peak pulse Current 1.5A, and it is from 256V ~ 315V when the test current is 1mA, the current will not exceed 1mA for PMP41009, so the maximum voltage at HV pin…
Part Number: PMP41009 Tool/software: Hi,
I made a flyback power supply with reference to PMP41009. But the switching frequency is not stable when a constant load is added. So what is the possible cause? What are the adjustments?
Thank you
Part Number: PMP41009 Other Parts Discussed in Thread: UCC28740-Q1 Hi,
I got some questions about UCC28740-Q1(Design reference PMP41009)
1. The recommended primary side ratio Nps of the transformer is 43.86, But this means a too much primary inductance…
Thanks for your reply.
And i wana know that dose the low duty ratio affect the stability of the control loop?
Can The resistances and capacitors be set the same as PMP41009 while I used a different optocoupler and adjustable shunt regulator than PMP41009…
Hi, Shilin,
It is possible to do the regulation without optocoupler. Below is the example to accomplish feedback through auxiliary winding(Vout), however, we can't directly add resistor on auxiliary winding rectifier voltage because there is no error…
Part Number: PMP41009 Why place a filter capacitor on the VS input even though specification states "Avoid placing a filter capacitor on this input which interferes with accurate sensing of this waveform"? Also, what noise effects are being considered…
I'm sorry for replying late, because in Japan, it was a long holiday during Golden Week.
As for the problem, I've solved it.
I will post a new thread if there is something I don't understand or want to ask.
Thank you.
