Other Parts Discussed in Thread: UCC28631 Hello,
I've tried implementing a universal input 45W flyback converter using the UCC28631 controller. My problem is that after following the datasheet and doing calculations and doing verification calculations…
I found that using 4.99K on R6 allows for startup at 70Vdc, that is good. When i cause a dip in bulk voltage down to 10Vdc, then back to 70Vdc with in 2 seconds it is fine. But the same dip over 5 seconds triggers the latch mode where the VDD pin circles…
Hi Matthias, the UCC28631 is suitable, as long as you adjust the value of R6 from the value recommended value in the datasheet, with the caveats mentioned in the link Patrick has posted above. The UCC287x family of controllers could also be suitable for…
Michael,
Yes, it is possible to trigger the CS pin fault detection if AC input is increased very slowly, depending on the particular design and the value of primary inductance Lmag and current sense shunt Rcs.
If Lmag is quite large, and Rcs is…
Hello Simon,
The UCC28631 is designed to provide continuous constant current control, but it cannot provide continuous constant power control. However, it does have the capability to accommodate a temporary over-load condition for limited time, depending…
Bernard,
So the UCC28631/2 device will not start up unless the HV pin sees >90V, correct?
Is there a way to get this device to operate at lower voltages, or is it necessary to choose one of the other chips you suggested?
-Thank you.
Part Number: UCC28910 Other Parts Discussed in Thread: UCC28730 , UCC28610 , UCC28631 Tool/software: Hi,
I need to design a flyback converter with 2 isolated outputs (12V 10mA, 6V 350mA).
Input 18V - 70Vdc
The most important requirement is the no…
Part Number: PMP20495 Other Parts Discussed in Thread: UCC28710 , UCC28631 , UCC28910 Hi team,
Could you please let me know the role of R2 connected in parallel to D2 in PMP20495?
I'd appreciate if you attach the relative app note of high-side buck…
Part Number: UCC28633 Other Parts Discussed in Thread: UCC28634 , UCC28631
Dear Sirs. We have designed a flyback conveter using the UCC28633 with a defined output of 65V following the recomendations from corresponding technical notes. But we are having…
Hi Mike,
Thanks for your reply.
Also, customer is considering DC HV start up, can you help clarify the difference between UCC28631 and UCC28634? Thank you！
Regards
Yunjing
