Mautaxe After this the circuit works pretty fine. As I mentioned the ebay item which I procured has similar behavior during startup. There is a current limiting resistor,so that should prevent excessive draw,even during start up? They have a similar example in the ds for 15V mA,where the inductor is uH. Any suggestions on how to improve this?
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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. 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.
They have a similar example in the ds for 15V mA,where the inductor datashset uH. Sign up or log in Sign up using Google.
Post as a guest Name. After this the circuit works pretty fine. Home Questions Tags Users Unanswered. I procured a similar circuit from here. I would focus on the coil.
During this time the battery voltage falls to about 1. The problem I am facing is that the voltage takes about 10s. Sign up using Facebook. EmbSysDev 1 1 Will it work correctly without pin 2 connected? Email Required, but never shown. The inductor in this configuration does not limit the output current. Any suggestions on how to improve this? Slow start up of LM Ask Question. Most 10 Related.
Note that this is already greater than the mA that the datasheet is specified to handle. During this time the battery voltage falls to about 1. I would focus on the coil. Your 1 nF capacitor sets the oscillator frequency at about 80 kHz, which is a After this the circuit works pretty fine.
LM3578 DATASHEET PDF
Will it work correctly without pin 2 connected? LM Datasheet pdf — Switching Regulator — National Semiconductor The datasheet only guarantees operation from 2V, so if your batteries are sagging below that, datashee either need some sort of soft-start circuit or some extra cells to stay above the minimum operating voltage. Note datadheet this is already greater than the mA that the chip is specified to handle. Sign up using Email and Password.
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