tasha Posted July 22, 2011 Report Posted July 22, 2011 Good Day SirsI would like to ask for consultation to everyone who will be able to help me with my problemi made an adjustable stepup voltage dc to dc converter, i was able reach my desired voltage but the problem is, i think it does not supply enough power, so even if i setup the voltage to 6volts once i plug in the device to the circuit the 6volts output drops to like 3+volts? can anyone help me with this? by the way here is the attached pic of the diagram i made using the lm2577 Quote
tasha Posted July 22, 2011 Author Report Posted July 22, 2011 do i have to replace my regulator or can it be solved? Quote
audioguru Posted July 22, 2011 Report Posted July 22, 2011 You forgot to tell us how much is your output current.You also did not tell us how low the battery voltage drops with your load. Quote
tasha Posted July 23, 2011 Author Report Posted July 23, 2011 huhuhuu...sorry sir don't have a tester for current output=(i set it to 6 volts then when loaded it dropped to 3.83v=( Quote
tasha Posted July 23, 2011 Author Report Posted July 23, 2011 by the way thanx sir for the interest to help=) Quote
audioguru Posted July 23, 2011 Report Posted July 23, 2011 Every cheap multimeter can measure DC current. Buy one. It can also measure the battery that might have its voltage drop when the stepup IC has a load. Quote
ARUN CHOWDARY Posted July 23, 2011 Report Posted July 23, 2011 dont u tried by changing the load resistance Quote
tasha Posted July 25, 2011 Author Report Posted July 25, 2011 ok sir was able to test it loaded at 1.6amps sir Quote
audioguru Posted July 25, 2011 Report Posted July 25, 2011 was able to test it loaded at 1.6amps But its max allowed load is 800mA so you overloaded it. Reduce the load current to 800mA then it should work well. Quote
tasha Posted July 25, 2011 Author Report Posted July 25, 2011 is there by any chance that the circuit be tweaked so it can handle load that big?or maybe i have to replace the stepup regulator? Quote
audioguru Posted July 25, 2011 Report Posted July 25, 2011 is there by any chance that the circuit be tweaked so it can handle load that big?No. Your output current is much too high and your input voltage is too low.maybe i have to replace the stepup regulator?Select a more powerful stepup regulator that works with your low input voltage. Quote
tasha Posted July 26, 2011 Author Report Posted July 26, 2011 sir audioguru, thank you very much for the patience in answering all of my questions, truly you are a wonderful asset her in electronicslab community=) muah muah=Owill this regulator do?MAX1709 Description4A, Low-Noise, High-Frequency, Step-Up DC-DC Converter Quote
audioguru Posted July 26, 2011 Report Posted July 26, 2011 Didn't you look at the datasheet of the MAX1709?Its max output voltage is only 5V, not 12V. Quote
tasha Posted July 26, 2011 Author Report Posted July 26, 2011 @sir audioit's ok, what i need is voltage that can be adjusted from 3.7v to 5.5v only, don't really need up to 12volts sir=)so can the new regulator do the trick for my requirements sir? Quote
Hero999 Posted July 26, 2011 Report Posted July 26, 2011 If you look at the Linear Technology, National and Maxim Semiconductor websites (Google them, if you don't know) you'll find a wizard to help you find the correct part. There's also a program which will help you to design the circuit. Quote
tasha Posted July 29, 2011 Author Report Posted July 29, 2011 thanx sir hero, will do that now=) thanx=) Quote
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