Delivery times may vary, especially during peak periods. This simulates very high frequencies and allows the use of small capacitors. I’m confident the way of calculating it in the datasheet using either the RDSon, or an external current sense resistor is fine. So this isn’t an exact science but we can guestimate some things. Learn more – opens in a new window or tab. This amount is subject to change until you make payment.

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Simulations are all well and good, but they aren’t sitting on a PCB hooked up to multimeters Ok, so more info. Did you try using a higher value inductor?

Anyone here used the LM3485?

Original price EUR 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. Lfd afraid I wasn’t aware I should have thought it through of this specification The hot fet means there is a significant voltage drop across the fet, likely activating the current limit.


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Lm3485 Led Demo Board

Blueteeth Well-Known Member Mar 19, Get an immediate offer. Please enter a number less than or equal to 1. Anyone here used the LM? Watch list is full.

Click here to register now. Some answers to questions: So, I’ve gone les to this project, dug out the PCB’s, and grabbed the new parts I ordered months ago for it.

As for your cap, that is probably the rest of the problem. Everything I try, serves to raise the frequency even higher. Lm348 by the 22uH inductor, I would off-the-cuff guess this circuit was designed to operate around k.

Discounted price EUR Hey folks, don’t know if anyone who replied here are still active members, I hope so! Sign in to check out Check out as a guest. With Vin from say V which should cover 9,12 and 15V adapters.


Also, since the output load can drop as low as 30mA, I wanted my converter to remain relatively efficient at these loads. For my own curiousity, I shall ked the output cap to something with a ‘crap’ ESR.

I hope it can at least help someone out, whether or not they are using this chip.

The PCB gets hot, but not ‘too’ hot after running for 5 minutes. It shouldn’t make a differece, but it does! The converter runs up to 1Mhz, the higher the frequency, the lower the inductance and capacitance required. More information at returns.

Media New media New comments Search media. The micro will probably lev the noise maker in fact.

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Select a valid country. This simulates very high frequencies and allows the use of small capacitors. I don’t know if the LDO is necessary.