Other Parts Discussed in Thread: UCC2897A , UCC3580-4 , UCC2894 , UCC2892 Friends:
Is it feasible to implement an active clamp forward converter using UCC2897A with the following nominal characteristics:
Vin = 350V
Vout = 24V @ 1A
If other…
Hi,
The reference for this design has been taken from the attachment ( slua303.pdf ). They have discussed about ZVS there.
If ZVS will not happen, what is the required leakage energy and how to calculate the same to achieve ZVS?
How much efficiency…
Hi,
Im looking at the document (attached) SLUA303. At page 38, equations 108 and 109. How can I plot these two equations to illustrate my uncompensated loop?
18541208960192.pdf
Hello Tansel,
The UAF42 topology does not accommodate differential operation. I suggest using a multiple-feedback (MFB) active filter which lends itself nicely to a differential input, or fully differential filter. I wrote an article for TI's AAJ some…
Hi Tracy,
We have a application note which can guide you how to design a ACF board with UCC2897A, I attached it for your reference.
Also we have EVM board on line. you can order one to test it . The link as below:
0044.Understanding and Designing…
Hi Alec,
Adjust gate driver resistor value only can speed up/down the turn on slew rate of MOSFET , But what we are talking about are hard switching or ZVS.
before the main FET turn on , there is must have a negative current through body diode .then…
Hi Tracy,
Firstly, you have to correctly biased the TL431B , TL431B require a minimum cathode current for regulation, it is 0.7mA. So please parallel a 1K resistor on the opto-coupler diode. I don't know how you adjust the loop compensation that let…
Hi Alec,
Attached an application notes for your reference. there is a step by step guideline to calculate the output inductor and the AUX winding turns .
You can find it from page 9th . hope can help you.
Thanks. Understanding and Designing…
Hi Hsu cheng,
Please kindly find attached UCC2897a Design Calculator in excel format. and I also attached a paper about how to designing an Active Clamp Current
Mode Controlled Converter Using the UCC2897A, in which you can get the answers of the…
Hello,
The UCC3806 is a dual output controller though it can be used in a flyback where only one of the outputs are used to drive the switch it might be better to choose a single output controller. Look at page 46 of the attached under General Purpose…
