The hot fet means there is a significant voltage drop across the fet, likely activating the current limit. Although, it was under pf, so I was hoping it was be ‘ok’. Contact the seller – opens in a new window or tab and request a postage method to your location. But frankly, its annoying me that I can’t lower the operating frequency to something more respectable like Khz. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Back to home page Return to top.

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In terms of component values the two largest contributors are the inductor, and output capacitor, as well as the ‘feed forward’ cap.

What type of breadboard did you use for the prototype? I used 24k initiailly, but changed this to 47k when the output dropped assuming it was curent limit kicking inmade no difference.

I might mock something up and see how it turns out. The hot fet means there is a significant voltage drop across the fet, likely activating the current limit. If you ever wondered how you motherboard can deliver Amps to your power hungry Core 2 Quad with those tiny caps, le use what is called a multiphase buck regulator.

> circuits > Lm Led Demo Board l –

As for the space issue, ma is not a lot, If you really wanted to, you could quite easily fit a ma switching converter in 1 square inch. I thought this was high enough as to not lm3845 a series resistor for correct hysteric operation.

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Once that is sorted, and keeping my 22uH inductor, I can experiment with output caps. And certainly something I would consider over a lfd switcher’ when cost is at a premium. Watch list is full.

Anyone here used the LM3485?

Skip to main content. New Circuits Ultrasonic distance finder circuit. Learn more – opens in a new window or tab Any international postage and import charges are paid in part to Pitney Bowes Inc. But I’m guessing my efficiency is far lower. Simple Metal detector circuit with CD Get the item you ordered or get your money back. Graphic LCD – Aff. This item can be sent to United Statesbut the seller has not specified postage options.

I have two prototypes, one on single sided FR4, all surface mount. Also the duty cycle was very close to my calculations always a plus eh? This slackens the restriction of using specific output caps to maintain stability and to keep the switching frequency within a range so that all other parts can be chosen within a certain band of values. Discounted price EUR I originally picked this chip because I wanted to use a small inductor, that is uH.

Anyone here used the LM?

Lm3485 Led Demo Board

Back to home page Return to top. Report item – opens in a new window or tab. On side note, as I had to effectively ‘build’ a circuit that behaves like the LM in LTspice no native spice model anywhere on the web I came up with a fairly straightforward pracitcal implementation, using aand LM plus some passives.

Sign in to check out Check out as a guest. Its ,m3485 me somethign rotton A current output of mA should be possible but it’ll probably be running at mA nominal. Echo Depth Sounding Sonar for Boats.