Sim300 - 0.4A to 2A burst

[wozney]

Im trying to find some help with a sim300

I think it needs to accept burst up to 2A. I have another device that it attaches to but that only outputs 0.4A. I need to be able to send SMS message

Is there a way to up the 0.4A to 2A so the device can work properly

this is the info i got from another topic

"Your power supply MUST be able to supply 2A spikes for several milliseconds (I think 2 or 3ms)."

Thanks for your help

 

[manenef]

A current transformer would suffice. take care to impedance match.

 

[wozney]

Would you be able to provide me a company that sells them. Also it can't be a large unit.. Needs to be small. Do they have units that are really small

 

[GSM Man]

I have another device that it attaches to but that only outputs 0.4A.

What "device" do you have that outputs 0.4A? Typically, if you connect a large (>2,000uF) capacitor directly to the power pin of the SIM300 that will provide enough current for the 'bursts'. You should also have a 0.1uF cap on that pin.

 

[rongo024]

LM2576 regulator ic

 

[GSM Man]

LM2576 regulator ic

The LM2576 is rated for 3.0A output.

 

[BuckySparks]

Page 7 of this app note has details on the transient load profile of gsm


do not upload any file that is already available online and for free, give the link to the file only ..... MOD Aya2002


www.cpg.com.tr/.../28112007034111_wm_an_26_pwr_supply_v03.pdf