Everything I try, serves to raise the frequency even higher. Will usually send within 3 business days of receiving cleared payment – opens in a new window or tab. To participate you need to register. Some have a feed forward cap of pf, some p, some have another cap from FB to gnd, some don’t have any. You must return items in their original packaging and in the same condition as when you received them.

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Image not available Photos not available for this variation. Lm385 managed to get the circuit working correctly. Gillyme9times New Member Jul 13, Click here to register now.

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Lm3485 Led Demo Board

International postage and import charges paid to Pitney Bowes Inc. Aside from buying various low esr caps, which are expensive I have many from old boards, just no ‘new’ ones must I be at the mercy of bloody ESR to determine lex converters frequency?

If a ceramic or film cap is used on the output, a series ked resistor must be added. Judging by the 22uH inductor, I would off-the-cuff guess this circuit was designed to operate around k. Original price EUR That’s the percentage of time it is in the ON state. If you don’t follow our item condition policy for returnsyou may not receive a full refund.


So, not my idea! I do strongly recommend you fix the Mosfet issue but you may be able to get it working right now by substituting a low ESR cap. I thought this was high enough as to not require a series resistor for correct hysteric operation. All waveforms look clean, the inductor current is held in a narrow window, and the output ripple is around 20mV.

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

The AC97 architecture separates the Analog and digital func- tions of the PC Audio system allowing both for system design flexibility and increased performance. Alas, leed they made errors in the values, or, more likely, I’m missing somethign obvious. Be the first to write a review. Plus, with the replies from this thread it helped me gain a much better understanding of converters, MOSFET’s, power electroics, and even filled in many gaps in my analogue knowledge.

Anyone here used the LM3485?

Also, since the output load can drop as ler as 30mA, I wanted my converter to remain relatively efficient at these loads. By National Semiconductor Corporation. Yep, I’m back to this. Datasheet says 50mohm ESR kHz. Postage cost can’t be calculated. Ill post a pic, this is a boost converter for a pressure sensor I designed. According to my ‘rough’ simulations, the ESR doesn’t seem to impact much on the operating frequency, just the output ripple. Unlike, standard linear regulator they aren’t really famous for stability anyway.


There are 1 items available. It works as expected when i breadboarded it Estimated delivery dates – opens in a new window or tab include seller’s handling time, origin postcode, destination postcode and time of acceptance and will depend on postage service selected and receipt of cleared payment – opens in a new window or tab.

I’m afraid I was assuming that the value simply determined output ripple rather than be a part of the hysteric operation as in this case. Multiple codec systems CAN be built using the standard AC-Link format of one serial data stream per codec, or using a unique National Semiconductor feature for chaining codecs together.

There is absolutely no reason to think you won’t have stable power for your micro. I might mock something up and see how it turns out.