I am building several battery operated circuits for a solar powered system.
One circuit requires 5v and another 10v
I am regulating lets say 14v supply down to 10v with a LM2940 due to its low dropout.
I am regulating the 14v supply down to 5v with a 7805. These are supplied seperatley but from the same battery.
I was thinking that the LM2940 has to disapate 4v in this case, and the 7805 must disapate 9v - total 12v.
Would it be more efficient to regulate to 10v and feed the 7805 that 10v as well as the circuit requireing 10v meaning 4v is disapated and a further 5v - total 9v, or do I have this all wrong and it won't make any difference?
One circuit requires 5v and another 10v
I am regulating lets say 14v supply down to 10v with a LM2940 due to its low dropout.
I am regulating the 14v supply down to 5v with a 7805. These are supplied seperatley but from the same battery.
I was thinking that the LM2940 has to disapate 4v in this case, and the 7805 must disapate 9v - total 12v.
Would it be more efficient to regulate to 10v and feed the 7805 that 10v as well as the circuit requireing 10v meaning 4v is disapated and a further 5v - total 9v, or do I have this all wrong and it won't make any difference?