As 78XX version, 79XX is also voltage stabilizer. But like 7805 have +5V stable the same is with 7905 just with opposite (negative) sign or -5V that's the only difference between these two voltage stabilizer. And here also the last two digit of 79XX represents negative output voltage. More detail about power consumption you can look at my previous post about LM78XX it's the same calculation.
ATTENTION
I know a lot of people who asked me if they can normally connect +12V on LM7905 as on LM7805 and the output voltage would be NEGATIVE -5V. Answer is NO!!!! Don't even try it otherwise your IC is DEAD! It would be remarkable to connect +12V and then he convert to negative voltage. But the man who would invent that hasn't been born yet. :D If you want stabilized negative voltage you must have negative input voltage. Now transformers with two or more secondary coil come to expression. but that in the next episode :)They can be found in different package as well as LM78XX, that's standard type TO-220, TO-3, SOT ... more about it you can find in datasheet.
How it looks in schematic
LM79XX DATASHEET
0 comments:
Post a Comment