3V to 5V dc-dc step up converter

3v to 5v converter

hi everyone...

i am a newbie and i have a problem here. i would appreciate very much if anyone can help me with it...

how to build a simple 3V to 5V dc-dc boost converter?

Thankx..(-_-)

3 to 5 volt converter

how about the MAX666. but it has a typical output current of 40mA. u didnt tell your current requirement so i cant tell u the right IC. but u can do a search on google, maxim's website, linear's website and national website. ull be glad to see the results

5v to 3v converter

actually i don't want to implement any ICs in the circuit. The current must be within 30mA.
I've done alot of research using the search engine but the circuit they recommand all uses switches but i am ask not to use one... so it's abit headache for me... Thanx for helping

step up converter 5v

i have to use discreet components to build the cirucit.

simple step up converter

8) A discreate solution will be difficult and costly.
if you want to try, try this---
Make an astable oscillator with low vcesat transistors with a frequency of around 25 Khz and then use a voltage doubler or a voltage tripler fallowed by a 5.1 Volt Zener for regulation.

or if cost is the problem even a 555 timer can be used as an oscillator fallowed by the voltage multipliers and Zener.

3v to 5v boost converter

i can't use these components caused it's for my school project it will be too costly for me...
Actually there's one site which i've visited show me how to build the dc-dc converter circuit but i don't know what values should i used for the components. Can you give me some suggestions? Thanz =)

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i've tried using these components but the results is wrong it didn't boost my circuit at all...

i've used:
1)150uH inductor
2)BC817-25 transistor
3)0.47uF cap
4)BAS85 diode

Thanxxx

555 step-up

the page doesnt work, it gives the following message

The page you have requested has moved or no longer exists.

Click to expand...

rauol has suggested a nice solution by using a 555 as the wave generator, followed by a voltage doubler. i dont think it would cost too much. but i would like to tell u that the most efficient solution will be a single IC solution. anyway u dont want to use that too.

3v to 5v dc-dc

**broken link removed**

go to >>>2. BOOST CONVERTER STEP-UP CONVERTER

sorry abt the broken link.

That's the problem, my project requirements stated all these restrictions...

dc-dc voltage multiplier 5v 3v

Hi. try max1676. It's very simple 3 condensaors and 22uH inductor. It have very low quescent current - 16uA
Input voltage 0.7-5.5V, Iout-300mA.
It have shutdown pin and low battery in and out pins.

Best Regards

3v voltage step up

thanx for the suggestions but i cannot use ic i need to use discreet components

5v step up converter

**broken link removed**
SanGal the circuit given above is only Block level, you have to use PWM to control the Switching transistor. now a PWM will require An IC and referance or it can be a transistorized controller which uses some few dozen transistors(it is like making your own IC)

555 step up converter

Here is the answer:

I will give you some equations that will solve your problem. The thing is i won´t deduct these expressions, i will leave this part for you becouse you have to learn things.

For the following equations refer to the boost converter on the website:

h**p://www.powerdesigners.com/InfoWeb/design_center/articles/DC-DC/converter.shtm

Click to expand...

Equations:

First find Ilavg (average inductor current):


Ilavg = Po/Vi


Second choose a working frequency. Let´s choose 20KHz...

With Fc = 20Khz we can find Ton and Toff (on and off times of transistor)

Vi = Vo*Toff / Tc

where Tc = 1/Fc and Vi =3 and Vo = 5 (you said)

We can obtain Ton = Tc - Toff

Now we have to set a project constraint. This constraint is the current ripple you are willing to expect on the inductor. Let´s choose a ripple equals to Ilavg.

dipp = Ilavg


dipp = Vi * ton / L

since we have Ton, Vi,dipp = Ilavg we can find the L

Now we have to find a capacitor. Any value (big enough, say 100uF) will do, but you can use this equation:

dVcpp = Io*Ton / C

where Io is the current on the load.
This Io can be obtained by Vo / R where R is the load resistance


Here we have another project constraint. dVcpp is the ripple you think is acceptable on your output voltage. Let´s sya it is 1% of Vo.

With all these data you can calculate the capacitor value...

As i said before you have to understand the process not just use these equations.

Another importante point: These equation are only valid for continuous conduction, this means, dilpp must be less or equal the 2 time Ilavg.

Try a power electronics handbook. It will help a lot. The above site is also very good and helpfull.

Any doubt send me a private msg.

I just don´t know how you are going to build the clock circuit....

hope i could help

mcoster

3 volt dc to 5 volt dc converter application

Hello, i think you didn't understand the project requirements correctly, i also had to built a DC-DC converter with DISCRETE components but what my teacher wanted was that i didn't use an IC that did it all, i had to use 555 LM311 4013 and so on, so i think you should ask what the project requirements really are before you kill your head with the project.

dc-dc converter 3v to 5v

what i am suppose to do is to integrate this dc-dc converter into a remote control to drive an LED because the current circuit which i used couldn't drive the LED when the voltage drop.

3v to 5v step-up converter

You could use LTC3402 or other model's from Linear Technology. LT is leader DC-DC converter's.

5v step-up converter

what i am suppose to do is to integrate this dc-dc converter into a remote control to drive an LED because the current circuit which i used couldn't drive the LED when the voltage drop.

Click to expand...

could u give some more details.

and one thing more. when u made that remote u probably used a couple of ICs. or was that discrete too?? if u did use some ICs in the remote, then why not in the DC-DC converter??

3v to 5v step-up

If you need large current,ithink you can use 3842+mosfet for boost topo to realize it,and you also can do with hitcup overcurrent protection

3v to 5v voltage multiplier

could u give some more details. and one thing more. when u made that remote u probably used a couple of ICs. or was that discrete too?? if u did use some ICs in the remote, then why not in the DC-DC converter??

Click to expand...

the reason i can't add in more ICs is that the PWB is already fix cannot change the layout already...

step up converter san antonio

Just as a note: You are using the wrong voltage. There is never a need to transform a 3Volt supply to a 5volt supply. You should use the voltage you want which is 5 volts.

dc step up 3v to 5v

that's because the remote control used 2 AA batt which can only supply 3V. Which was the reason why i need to step up the voltage..