LM3485 LED DRIVER

Although, it was under pf, so I was hoping it was be ‘ok’. Have you computed your switching frequency correctly? Once its functional, and running cool, then comes reducing board space. Fancy ones with integrated switches, simple control loops etc.. For a better experience, please enable JavaScript in your browser before proceeding.

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Well, to my surprise, despite the datasheet claiming one must ‘raise’ the frequency I found that with a feed forward cap circuit as specified in the datasheet of pF, output voltage 3.

Anyone here used the LM3485?

The waveforms combine at the output before the capacitor. But I’m guessing my efficiency is far lower. Forums New posts Search forums. Since you said you used the same circuit, I would assume it’s the same.

Lm3485 Led Demo Board

Once its functional, and running cool, then comes reducing board space. Interconnection and Timing of Digital Circuits. So, I guess the main problem with my setup is the FET?

Also, the output capacitor must have a well defined esr. Media New media New comments Search media. What type of breadboard did you use for the prototype? Articles Top Articles Search resources. Get the item you ordered or get your money back. Found this link om3485 is an application note for a similar albeit synchronous hysteretic converter: I hope it can at least help someone out, whether or not they are using this chip.

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If you ever wondered how you motherboard can deliver Amps to your power hungry Core 2 Quad with those tiny caps, they use what is called a multiphase buck regulator.

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Anyone here used the LM? | Electronics Forum (Circuits, Projects and Microcontrollers)

I came across this article: It is designed to output 3. So, not my idea!

According to my ‘rough’ simulations, the ESR doesn’t seem to impact much on the operating frequency, just the output ripple. The hot fet means there is a significant voltage drop across the lled, likely activating the current limit.

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No additional import charges at delivery! It is hysteretic, which means variable frequency. Blueteeth Well-Known Member Mar 19, This is why I love this forum, one can get real world practical advice from those who have more experience.

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Original price EUR They are basing their charts on a 80 millohm capaciter. Probably should have ground plane on the other side, but I didn’t have any doublesided Lmm3485 material at the time.

Using the same values as they specify, the frequency goes up to The higher the frequency, the more important this is. Learn more – opens in a new window or tab International postage and import charges paid to Pitney Bowes Inc.