The LM/04HV are monolithic switching regulators de- VIN Range 6V to 42V (LM) .. the front page of this datasheet, the inductor and LED can. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2All trademarks are the property of. The LM/04HV is a buck regulator derived controlled cur- .. Reproduction of TI information in TI data books or data sheets is permissible.

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LM Datasheet(PDF) – National Semiconductor (TI)

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For a better experience, please enable JavaScript in your browser before proceeding. Thread starter cjurczak Start date Dec 27, I threw together a small PCB to test and make sure Pm3404 have everything working. And to my surprise it works the first time I turn the power on.

LM3404 Buck LED driver IC overview

I know its not much, and the board is kind of messy, but it gets the job done Ok now for the problem After letting it run at for a few moments longer it settled at about 16mA and I noticed that they recirculating diode is hot to the touch I unplugged the power everything cooled down promptly And upon applying power everything repeated So in an effort to cool it off while still running I blew onto the board Up to about 25mA No where near the designed mA From the LM datasheet this seems to be a suitable diode for use in this situation I’d appreciate any comments or previous experience on this topic This board is being use just as a proof of concept, since I have never used this chip before Eventually I’d like to incorporate it into a larger project, but not unless I can iron out this bugs Thanks for all your time, and help Ubergeek63 Well-Known Member Dec 28, If, for instance, the LED is at 3.


If, on the other hand, you are running from 25V you said you are using 30V diodes you have 3. So conduction dissipation alone becomes 0. Which brings up another question: Sorry for the delayed response, I’m been on the road and I didn’t have anymore specifics Supply voltage for the system is a 12VDC switching psu Operating frequnecy is about kHz, set be a k resistor The inductor is a 22uH 1A inductor The inductors datasheet is here Which is why I have the input voltage at 12VDC Would a higher rated diode with a larger package be of any use to help dissipate heat more effectivly, and hope to keep it operating normally Or should I try to match my source more carefully to my load?

LM overview, product comparison and replacement search

I seems dropping all this energy on the diode would be inefficient I was hoping this design would datashert an energy efficient solution Thanks again for all your help You must log in or register to reply here. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Potentiometer Questions Started by norbss Yesterday at Started by fastline Yesterday at 8: Just saying hello Started by MichaelaJoy Yesterday at 6: This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.


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