EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: laserpon3 on March 12, 2014, 08:41:54 am
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Hello Everyone,
I'm trying to grasp the essentials about circuit design with eaglecad.
I can etch my own single sided pcb's with green solder mask and solder reflow with my modified toaster reflow oven and have learned the majority of schematic symbols *.
The circuit I want to make is the following circuit:
(https://www.mediafire.com/convkey/125b/ubb7pummg3e9lae6g.jpg)
(found on page 28 of this datasheet: http://www.ti.com/lit/ds/symlink/lm2596.pdf (http://www.ti.com/lit/ds/symlink/lm2596.pdf)
It is an inverting regulator (I want to turn a SMPS into a differential one)
I'm using a salvaged LM2596S from a buck converter (this one in fact: http://www.ebay.com/itm/181227591312?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 (http://www.ebay.com/itm/181227591312?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649)) and have bought multiple to be able to provide multiple voltages from 1 supply.
The circuit I ended up making in eaglecad was this.
(https://www.mediafire.com/convkey/190a/267utgm72w9wwdg6g.jpg)
I'm very sure I went in the wrong with the ground connection, on top of that I have no idea what where I could insert a pot to make this inverting regulator be adjustable as well.
I really hope I'm not asking too much
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Read the datasheet again. You have implemented the undervoltage lockout FOR the inverting regulator, but you haven't implemented the switching part at all :)
Figure 37 is more like what you want. Possibly without the delayed start if you don't need it. My guess is you have no idea if you do or not.
I would also suggest that you use Eagle's "smash" function on all your components and move their designators and values so they don't overlap other components and are not placed vertically.
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Read the datasheet again. You have implemented the undervoltage lockout FOR the inverting regulator, but you haven't implemented the switching part at all :)
Figure 37 is more like what you want. Possibly without the delayed start if you don't need it. My guess is you have no idea if you do or not.
I would also suggest that you use Eagle's "smash" function on all your components and move their designators and values so they don't overlap other components and are not placed vertically.
Thanks very much! :) I'll look into all of this.