Skogsgurra,
Thanks for the help.
For anyone who wants to know. I found out why the output would not come on right away. In the spec sheet there is a start up threshold. For this chip it is 11.2V to 12.8V. I only had 11.7V on VDD. I increased that to 13.5V (max is 15V) and it works perfect.
Great. Thank you. This seems much more simple than setting up an error amp. Any idea why it takes so long for the circuit to output the PWM signal? I can apply power to my circuit and it takes almost five minutes for it to out put the PWM signal.
Again thank you for your reply.
Jesse
A little more info.
It seems that the feedback pin on this chip is intended to be interfaced with an optocoupler. So do I need to hard set the feedback voltage and only have it come on if the output voltage falls below a set level? I thought that this pin would use something similar to an...
Sorry I thought I uploaded my schematic to the site...here it is. I didn't realize I had to copy/paste the link.http://files.engineering.com/getfile.aspx?folder=b4ea0bee-0b93-467f-ae8c-2fc329a5299a&file=UCC25706.pdf
Hi everybody
I have never used this kind of IC before and have never really fully designed a boost converter ethier. I thought this would be a great learning experience. With the power portion of the converter aside I had a few questions about the UCC25706 chip.
Here is a list of parameters...
