thermal printer power supply......

[jit_singh_tara]

Hello friends ,


I am using a thermal printer ...it runs well on SMPS .......IT requires 1.5 Amps while printing.....


When i try to run it using lm317 to generate the specified voltage 7V.it doesnt work......I tried to measure the current in this case ....it shows only around 300 mA.....

what i figured out is that smps was able to provide full current 1.5Amps while my regulator lm317 was not , though it is rated to provide around 1.5 Amps.....

Please suggest what to do ......how to run the printer using this regulator.....

Thanks and regards
Jitender....

 

[amayilsamy]

You can use LM350 Adjustable Voltage its support output current 3 A.

http://cxem.net/doc/pitanie/LM350.pdf

And Some Linear regulator available..

Or Otherwise you can choose Switching regulator Like LM2596,LM2576 etc..

And one more Chance in LM317 you connect parallel it can give more current.

Refer LM317 Datasheet.


http://www.ee.buffalo.edu/courses/elab/LM117.pdf

Page # 22
I hope its helps you.

- - - Updated - - -

 

[jayanth.devarayanadurga]

Your Transformer should be of 1.5A and above if you want 1A. Regulator doesn't give 1A. If you want 1.5A output then choose your transformer which can provide 3A and regulator which can handle 3A So when you drive 1.5A it will be working at 50% load and the components will not heat. You can also use battery whose rating is > 2 or 3Ah.