Part Number: PMP41009 Other Parts Discussed in Thread: UCC28740 , , PMP41031 Tool/software: Hello, I am debugging a self-designed flyback switching power supply with an input of 90-900VAC and an output of 24VDC. I use the UCC28740 chip and adopt the relevant…
Part Number: PMP41009 Other Parts Discussed in Thread: UCC28740 , Tool/software: Hello,
1：I want to design a wide-range input flyback switching power supply with 120-1350VDC input, 24V output, and 40W output power, referring to the circuit in PMP41009…
Part Number: PMP41009 Hello Linda,
TVS is used for voltage clamp in the design of PMP41009 and the clamp voltage VC of P6KE300A is 414V, So how to ensure that it will not exceed the maximum voltage of HV pin 700V?
What should I consider when choosing…
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…
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…
Part Number: PMP41009
Hi:
I have a question about the selection of Rcs and Lp.
In my design, the Lp calculated by sluc487b is too large. This will make the volume of the transformer large. If I choose a smaller Rcs I can reduce the value of Lp.…
Part Number: PMP41009 Other Parts Discussed in Thread: UCC28740 Hi Experts,
We are researching the reference design PMP41009, with below two questions:
1. In the cascode architecture, the normal operating voltage of D3 on the two side of Q1 G-S is…
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…
