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SMD SMPS Power Supply

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schmitt trigger said:
The optimal of course, is to have a single battery powering everything.

That battery voltage should be equal to the motor's requirements.
Why? Because the motors draw LOTS AND LOTS of power during acceleration, and even the most efficient PSU will waste significant amounts of power.

Then, use a MUCH SMALLER PSU to power the electronics.
Click to expand...

Hi
In My case the important is to keep constant voltage across the line sensor
 

Did you Read my reply:
Use a PSU to power the electronics.

By electronics I mean the sensors plus any ancillary circuits that require tight voltage regulation.

The PSU may be buck, boost or Sepic depending whether the output is lower, higher than the battery voltage.
 
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schmitt trigger said:
Did you Read my reply:
Use a PSU to power the electronics.

By electronics I mean the sensors plus any ancillary circuits that require tight voltage regulation.

The PSU may be buck, boost or Sepic depending whether the output is lower, higher than the battery voltage.
Click to expand...

Thanks for the reply

Have you work with LTC 3112 which can be used as PSU so I need to use single micro switch to power on and off using LTC3112 and I sow LTC3112 has a pin called "RUN". Can I able to use this pin power on and off using micro switch

Please advice

Thanks in advance
 

Hi,

reading the datasheet helps..

it says:
RUN (Pin 6/Pin 7): Shutdown Control Input. Operation
will be disabled when the voltage is forced below 0.75V
(typical) and less than 1µA of quiescent current will be
consumed.

What additional information do you need?

Klaus
 
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KlausST said:
Hi,

reading the datasheet helps..

it says:
RUN (Pin 6/Pin 7): Shutdown Control Input. Operation
will be disabled when the voltage is forced below 0.75V
(typical) and less than 1µA of quiescent current will be
consumed.

What additional information do you need?

Klaus
Click to expand...

Thanks for the reply

Yes assumed we connected micro switch to this RUN pin with pull up resistor ( Tied to 5v) and other side to ground

when we pressed the switch the voltage at RUN pint less than 0.75v and then it will shutdown but when we released the switch it will go to 5v and power ON again

Please advice

Thanks in advance
 

Hi,

what other function do you expect?

Klaus
 
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LTC3112 Vboost regulator experience

Dear All
Have a nice day

I am going to use LTC3112 Regulator IC as 9 v to 12v Vboost
I need to On and OFF the regulator using micro switch. as per the data sheet the LTC3112 have a pin called RUN

Please advice me if I can use this IC with my requirement

Is there any who have experience working with this IC

Data sheet https://www.google.lk/url?sa=t&rct=...9gdkPOlc4aKNvg6xw&sig2=Ubt2tlh2tdtaEikdoFf5tA

Your reply is highly appreciated

Thanks in advance
 

Re: LTC3112 Vboost regulator experience

Grounding the 'run' pin will turn the output off.
 

Re: LTC3112 Vboost regulator experience

Hi,

Please ask clear questions instead of starting new threads.
I merge both threads.

Klaus
 
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Thanks KlausST

Really I need to verify that the LTC3112 IC have a pin called "RUN" so can I use it to ON and OFF the output by using micro switch. Datasheet has explain it but i have not clear it

what data sheet says
RUN (Pin 6/Pin 7): Shutdown Control Input. Operation
will be disabled when the voltage is forced below 0.75V
(typical) and less than 1μA of quiescent current will be
consumed.
Click to expand...

Please see the datasheet hear

https://www.google.lk/url?sa=t&rct=...9gdkPOlc4aKNvg6xw&sig2=Ubt2tlh2tdtaEikdoFf5tA

see below picture for better understand my wiring with micro switch and LTC 3112 IC


111.JPG
 
Last edited:

The 220 ohm resistor seems useless. At worst case it doesn't allow to switch the converter off (if RUN threshold is in the lower range).

The permanent pull-up draws 2 mA battery current in off state.
 
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FvM Thanks for the advice

Still I don't know that LTC 3112 power on and off using RUN as per the above circuit once I removed the 220 resistor and connect it to ground

I am expecting when switch pressed once the power ON and when switch pressed again the power off...... Is this method working with LTC3112


Please advice

Thanks in advance
 

O.K., you are asking for a toggle switch function. That's not achieved by this or any similar voltage regulator I'm aware of. Last time I implemented similar logic in a device I used a D-flip-flop.
 
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Hi,

at least I understand the problem....

Use a toggle switch instead of a pushbutton, then the problem is solved mechanically instead of electrically.
Nobody will recognize the difference.

Klaus
 

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