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Too much current out of flyback converter, how to reduce it ?
Forgive my lack of writing ability. I are a engineer, not a english major. It seems to me that the USB is supposed to be powering the design. So, if you look at the USB connector...
Monday, 23 November 2020 - 23:53
Too much current out of flyback converter, how to reduce it ?
Look at D1. Now answer my question... :)
Monday, 23 November 2020 - 23:10
Too much current out of flyback converter, how to reduce it ?
So, I have to ask, what is the NCP1117 supposed to be doing?
Monday, 23 November 2020 - 16:32
Too much current out of flyback converter, how to reduce it ?
Also, USB3 supplies 5V at up to .9A. Doing the math, that is 4.5W. The fan needs 3.6W. (12V at .3A). The boost will have losses. You might have a fan that runs, but you will be...
Tuesday, 17 November 2020 - 17:11
Boost regulator excessive noise
I just found out some of the bad managers I worked for must have taught me bad things. Sorry about that. :)
Sunday, 16 August 2020 - 14:18
Boost regulator excessive noise
Good results?
Sunday, 16 August 2020 - 00:03
Boost regulator excessive noise
I would recommend it, yes. Capacitors should be ceramic X7R. Layout board for a few more than you think you need and stuff them if there are issues. You can always NOT stuff a...
Sunday, 9 August 2020 - 14:15
Boost regulator excessive noise
You stated that the inductor you are using is '120ma'. Inductors normally list current of Isat. Looking at the data sheet, the lowest Isat inductor recommended is 700ma. Highest...
Sunday, 9 August 2020 - 00:15
Boost regulator excessive noise
The Isat of your inductor is way too low. Check out the data sheet again. Take their coil comments to heart.
Saturday, 8 August 2020 - 13:03
How to calclate Rb value
When using a BJT transistor as a switch, in fully saturation, a good rule of thumb (used since 1972 by me...) is to assume a beta of 10 to assure it is fully on. Does not...
Tuesday, 16 June 2020 - 21:51
Selecting a PNP transistor for high-side drive
Oops. Missed that pre bias stuff. I never used those in design because they were more expensive than the discrete parts and when large quantities were involved, saving 10 cents...
Sunday, 26 April 2020 - 15:23
Selecting a PNP transistor for high-side drive
Try googling Baker Clamp and try that. I used one in the 1970's on a switcher power supply I designed to good sucess.
Sunday, 26 April 2020 - 15:08

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