Supply current vs supply voltage

Question

I would like to know how to interpret the graph on the datasheet for the MAX1771, please. 
 Page 4 of the datasheet shows a graph of supply current vs supply voltage. 
 --does this mean for 12V input the chip will only output ~0.1 Amp? 
 
 I'm using the MAX1771 in non-bootstrapped mode, V+ = 12V. 
 I need to limit the current thru my transformer to <0.5A. 
 So looking at Figure 4B on page 10 of the datasheet if I use a Rsense of ~100 mOhms it should work, correct? 
 
 Thanks in advance for any help!! 
 --Don

RDSmith · Accepted Answer

It is referring to the current into entire circuit if there was no load on the output. So this would be the current into the IC's V+ pin, plus the supply current needed to maintain the output at the setpoint with the given feedback / schematic. 
 
 The current limit chosen is a combination of the sense resistor and the built-in current limit. Per the Electrical Characteristics table, the current sense trip voltage is 100mV +/- tolerance (varies with IC grade). That will be the *peak* current, not the average current.)

Popular Forums

Product Forums

Application Forums

Design Center Forums

Highlighted Webinar

Places

Libraries

Latest Webinars

Challenge Yourself!

What's Brewing

Places

Resources

Highlighted Blogs

Latest Blogs

ADI Blogs

Visit ContentZone

Featured Content

View Content By Industry

View Content By Technology

Products Mentioned

Thread Details

Supply current vs supply voltage