Hi all,
I am trying to design and test this circuit to power several ICs in my complete design model (please see .gif attachment). There are several 15V regulators, one 6V and a couple of 5V ones.
The problem is the power supply (as you can see in the .gif) is a 48Vdc battery. How do I step this down to say 24 - 30V for the regulators?
Well, I tried using two 100kOhm resistors as a voltage divider. Works pretty well when regulators are not loaded. When they are loaded, the output voltage drops to something unusable. I want to use 4 of the 15V regulators to power Mosfet gate drivers, so I expect the output currents of these regulators to go as high as 1A.
I suppose the problem is with the large resistors in the voltage divider which limit the current. I tried reducing their values, but this leads to other problems of large losses in the resistors (even when no load is connected to the regulators).
I used Proteus Isis
What can I do to solve this problem?
Thanks for listening...
Edwin
I am trying to design and test this circuit to power several ICs in my complete design model (please see .gif attachment). There are several 15V regulators, one 6V and a couple of 5V ones.
The problem is the power supply (as you can see in the .gif) is a 48Vdc battery. How do I step this down to say 24 - 30V for the regulators?
Well, I tried using two 100kOhm resistors as a voltage divider. Works pretty well when regulators are not loaded. When they are loaded, the output voltage drops to something unusable. I want to use 4 of the 15V regulators to power Mosfet gate drivers, so I expect the output currents of these regulators to go as high as 1A.
I suppose the problem is with the large resistors in the voltage divider which limit the current. I tried reducing their values, but this leads to other problems of large losses in the resistors (even when no load is connected to the regulators).
I used Proteus Isis
What can I do to solve this problem?
Thanks for listening...
Edwin