LM Switching Regulator. The is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the buck, boost, and. LM datasheet, LM circuit, LM data sheet: NSC – Switching Regulator,alldatasheet, datasheet, Datasheet search site for Electronic Components. LM Datasheet, LM PDF, LM Data sheet, LM manual, LM pdf, LM, datenblatt, Electronics LM, alldatasheet, free, datasheet.

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Hello all, I have this circuit which will take an input 4×1. The problem I am facing is that the voltage takes about 10s. During this time the battery voltage falls to about 1. After this the circuit works pretty fine.

I procured a similar circuit from here. Any suggestions on how to improve this?

DC motor speed control using LM3578

Your symptoms are actually a datasbeet contradictory. The excessive sag in battery voltage suggests that the circuit is drawing far more current than it should during startup, while the slow rise in output voltage suggests that the current is too low for some reason. Your 1 nF capacitor sets the oscillator frequency at about 80 kHz, which is a With a minimum input voltage of 3.

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Note that this is already greater than the mA that the chip is specified to handle. You’re overloading it, and this is datasheey to cut into your overall efficiency, dropping as much as 0. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Home Questions Tags Users Unanswered.

Slow start up of LM Ask Question. EmbSysDev 1 1 The datasheet only guarantees operation from 2V, so if your batteries are sagging below that, you’ll either need some sort of soft-start circuit or some extra cells to stay above the minimum operating voltage.

LM Datasheet pdf – Switching Regulator – National Semiconductor

Will it work correctly without pin 2 connected? There is a current limiting resistor,so that should prevent excessive draw,even during start up? Laszlo 1 I am doing this on a proper pcb with a ground plane,initially i had used a DIP version on a stripboard,with slightly better results. I would focus on the coil. The inductor in this configuration does not limit the output current.


But if the inductor is saturating, it’ll never get there. They have a similar example in the ds for 15V mA,where the inductor is uH. As I mentioned the ebay item which I procured has similar behavior during startup.

LM Datasheet(PDF) – National Semiconductor (TI)

In both circuits sometimes, rarely it powers up immediately,which is quite perplexing. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

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