Hi All,
I'm familiar with using the 7805 reg to some degree, like the one referenced here http://www.datasheetcatalog.org/datasheets/150/44435_DS.pdf
I'm hoping someone could explain..:
1. Dropout Voltage.. I think I get this, if so these would be correct.. no ..? - for the 7805 5V Reg
Vin/Vout
10 / 5
8 / 5
7 / 5
6 / 5
5 / 5
4 / 4
3 / 3
2 / 2 - Dropout Voltage..
1.9 / 0
1.5 / 0
1 / 0
2. What happens to the excess voltage.. is it just dissipated in heat?
3. Slightly outside the scope of the question but what would I use for a situation where my Vin will start at 10V and slowly decline to say 3volts but I want to have a 5V regulated(and no less than 5V) for as long as I can.. i.e. a dropout at 5V.
Curve like this..;
Vin / Vout
10 / 5
8 / 5
6 / 5
5 / 5 - dropout here
4.8 / 0 - below droput
4 / 0
3 / 0
feeling like this is a long winded question.. but thanks in advance, no doubt a simple answer!
I'm familiar with using the 7805 reg to some degree, like the one referenced here http://www.datasheetcatalog.org/datasheets/150/44435_DS.pdf
I'm hoping someone could explain..:
1. Dropout Voltage.. I think I get this, if so these would be correct.. no ..? - for the 7805 5V Reg
Vin/Vout
10 / 5
8 / 5
7 / 5
6 / 5
5 / 5
4 / 4
3 / 3
2 / 2 - Dropout Voltage..
1.9 / 0
1.5 / 0
1 / 0
2. What happens to the excess voltage.. is it just dissipated in heat?
3. Slightly outside the scope of the question but what would I use for a situation where my Vin will start at 10V and slowly decline to say 3volts but I want to have a 5V regulated(and no less than 5V) for as long as I can.. i.e. a dropout at 5V.
Curve like this..;
Vin / Vout
10 / 5
8 / 5
6 / 5
5 / 5 - dropout here
4.8 / 0 - below droput
4 / 0
3 / 0
feeling like this is a long winded question.. but thanks in advance, no doubt a simple answer!