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buck boost converter

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spec

Well-Known Member
Most Helpful Member
Hi Amey,

Welcome to ETO.

I see you are from India; care to put that next to 'Location' on your user page so that it displays in the window at the left of your posts.

You say that you want a circuit for an LM555 based buck boost power supply: afraid that is not enough information for us to give you a realistic answer. We need to know at least the following:

(1) Use of circuit
(2) Input voltage and current available (power supply for LM555)
(3) Output voltage range required
(4) Output current range required

spec

Crossed posts Eric :)
 

amey kelkar

New Member
Hi Amey,

Welcome to ETO.

I see you are from India; care to put that next to 'Location' on your user page so that it displays in the window at the left of your posts.

You say that you want a circuit for an LM555 based buck boost power supply: afraid that is not enough information for us to give you a realistic answer. We need to know at least the following:

(1) Use of circuit
(2) Input voltage and current available (power supply for LM555)
(3) Output voltage range required
(4) Output current range required

spec

Crossed posts Eric :)
Hey...
I m trying to simulate the ckt which I got from Google....
There is so many problems​
 

spec

Well-Known Member
Most Helpful Member
Care to show us the circuit?

What simulator are you using?

spec
 

schmitt trigger

Well-Known Member
On simulators, many times you have to set up the initial conditions for the solution to converge.

The way to do so varies on each simulator. Unfortunately I'm not familiar with Proteus.
 

Willen

Well-Known Member
Amey, post your circuit first, then they can help you precisely to simulate. Or they may attach the simulated file too.
 

spec

Well-Known Member
Most Helpful Member
Hi Amey,

Below is a part schematic showing the components in your original circuit re arranged.

The additional capacitors are decouplers: don't be tempted to omit then because they are essential for reliable and predictable operation of the circuit.

I have no idea what the input voltage is because you haven't said so there may be problems with the 555 12V supply line.

The output diode would work better if it were a high speed Schottky type.

I haven't completed the design or analyzed the pulse width modulation function or the feedback control; I thought you may like to experiment.:)

spec

2016_10_07_Iss1_ETO_BUCK_BOOST_SMPSU_Ver1.png

 
Last edited:

amey kelkar

New Member
Thank u so much....
I will try this
E="spec, post: 1275813, member: 259274"]Hi Amey,

Below is a part schematic showing the components in your original circuit re arranged.

The additional capacitors are decouplers: don't be tempted to omit then because they are essential for reliable and predictable operation of the circuit.

I have no idea what the input voltage is because you haven't said so there may be problems with the 555 12V supply line.

The output diode would work better if it were a high speed Schottky type.

I haven't completed the design or analyzed the pulse width modulation function or the feedback control; I thought you may like to experiment.:)

spec


[/QUOTE]
Thanx
 
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