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Hi everyone, i have a DC 11V ,100mA= 1.1W, is there any way to convert it to 5V 230mA=1.1W?? is this achievable using a 7805 voltage regulator?
if not, please tell me how.thanks for your reply
hi dark, thanks for the reply. can i use a 5v zener diode to act as voltage regulator and achieve the 5V 0.23A??
im trying to use this power to charge a cell phone and 5V 0.23 is sufficient enough to do it
Hi everyone, i have a DC 11V ,100mA= 1.1W, is there any way to convert it to 5V 230mA=1.1W?? is this achievable using a 7805 voltage regulator?
if not, please tell me how.thanks for your reply
The max output current is 500 mA, as stated. The current can be limited using a resistor in series with the output.Electrical Characteristics (MC7805/LM7805)
(Refer to test circuit ,0°C < TJ < 125°C, IO = 500mA, VI = 10V, CI= 0.33μF, CO= 0.1μF, unless otherwise specified)
Sorry, this is worse than a 7805 because the series resistor wastes as much as the 7805 plus zener diode bypasses additional current. It can only supply 5V 100mA or less from 11V 100mA.have alook at the following links ;
12V to 5V DC converter using Zener diode and transistor : simple electronics
Would work if the value of Rb is adjusted for 11V. (I would start playing with 18k.) It's unregulated so it passes any variations from the incoming 11V. It would probably be around 60% efficient (11V 100mA in, 5V 132mA out) at best, because it uses the NPN in emitter follower configuration. The choice of diode D is critical to efficient operation, but none is recommended. It runs at about 20kHz so a fast schottky diode is a pretty good idea. 1N4001 is a poor choice. Coil isn't specified either.
you might require slight modifications also do consider the charging rate for the celphone battery . Even if you loose some current as conversion losses it will just take more time to charge your battery. There are dedicated buck converters out there ,if you need for hobby purpose the above links looks good to me .
That said, the Black Regulator is better than any of the suggestions, mine included.Pin 3 is connected to L, there's no transistor. Rb becomes 24k. L needs to be between 250 and 500 microhenries.
And those new emoticons are awful too! They are tiny and just don't have personality like the old ones did.