The circuit is a boost step-up regulator based around an LM2577-ADJ voltage regulator chip and a few other discrete components. Resistors R1 and R2 set the regulated output voltage.
A switch inside the voltage regulator closes between pins 4 and 3, causing current to flow through the inductor to ground. When the switch is released a few microseconds later, a back-EMF ‘kick’ is produced by the inductor, resulting in a positive pulse with respect to the input voltage. This pulse charges the output capacitor via the schotky diode, which tends towards an equilibrium voltage.
The switch continues to oscillate, the diode preventing the switch from shorting the output capacitor during the ‘on’ phase. The output voltage is monitored via the voltage divider R1/R2, causing the duty cycle of the switch oscillator to be continuously regulated in order to maintain a constant output voltage under varying loads.
The output voltage defined by R1/R2, if you want to take a 12 volt to 15 volt dc booster is easily.
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Note:
You can buy the circuit module that easy to use at amazon.com.
LM2577T-12/NOPB – IC, STEP-UP VOLTAGE REGULATOR
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mike
12 Jul 2012tnks,,, ive coppied your designs,,
taher
12 Mar 2013I amateur electrons and your web site very interesting and very useful, but i need your help in the circle to convert 12 volts to 19 volts with 4 AMP used for a laptop? Thank you very much
eli
6 Feb 2014hey does this work for 12v 3amp power supply? 🙂
admin
7 Feb 2014Hi, taher
Now, I do not have the circuit as you need.
But I see in amozon.com it have look alike.
https://t.co/rJNofcTF3r
Balaji
3 May 2014I need a 5dc to a 20v dc 3amp converter. I tried lot of circuits but no use Plz anyone help me to build right one
adelusi
2 Mar 2015sir how could i make 100uf inductor? and what is actual output voltage ?
zafar
23 Apr 2016Sir I have old car and electric wiring decade Windows moter not working properly. I want circuit that’s enhance the 12 V to 12 V with high current.
davo
31 May 2017Hi guys. I have a 12V to 15V 8A step up module I purchased off eBay. I am using it out of my car accessory socket and outputting through a 30a solar charge controller to charge and maintain an auxillary AGM battery. It works fine for a few minutes and then seems to spike blowing the 15A fuse in my accessory socket plug. I added 2 6A x 100V power diodes in parallel into the input side as i read somewhere that it is possible to get a back AC spike out of some of these circuits but it hasn’t helped. Any ideas??
jagatap pk
9 Oct 2018hi guys m required 4-5 volt dc convert to 12 volt 2 amp out req plz tell convertor details
ElecCircuit.com
9 Oct 2018Hello, Jagatap pk
Thanks for your visiting my site.
I try to test my circuit. https://www.eleccircuit.com/12v-24v-step-up-converter-circuit-using-tda2004/ . It cannot give a high current as you want. You may buy DC converter at Amazon or online store it is so inexpensive. But If you need to build circuit diagram. Now I do not have the circuit. I am sorry.