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…
Yes, that was one of the main selection methods I used, but it looks like there are also important parameters to select. I changed the FET, for one with less RDSon, lower gate charge, and lower threshold voltage and now the circuit starts perfectly, and…
Part Number: UCC28740 Other Parts Discussed in Thread: UCC28180 Hi,
I need to flyback converter IC. Could you suggest IC part number which has spefication in the below ?
Frequency:
How do I determine the maximum and minimum switching frequency specifically…
Part Number: UCC28740 The current thresholds for VS are 225uA for start and 80uA for stop. Start condition as I understand is a current over 225uA for each pulse to continue running, but how to use/understand the 80uA limit?
/Bert H
Part Number: UCC28740EVM-525 Other Parts Discussed in Thread: UCC28740 , TL431 Hi,
Thank you for your helpful response.
Can I use this controller with a non-isolated compensation network (FB pin)?
Thanks,
Raya.
Hi Eric, with your number of turns from transformer and Lp I get Rcs=0.171ohms(considering Iocc =2.5A(overcurrent value when converter goes to CC mode)) and RLC=0.225ohms.
I recommend updating values from EVM for your new design.
Thank you
Part Number: UCC28740 Hi,
I was able to see some UCC28740 reference design with Wurth transformer 750318383.
I want to generate the 13V @200mA, 7V @1.5A and -13V @100mA using mentioned part umber combinations.
Is it possible to do the same? If yes, please…