isaac12345
Member level 2
Hi,
I am using an Onsemi MC33269TG voltage regulator as a constant current source to charge a pack of NiMh batteries (12V). I found that on switching off the circuit's input the battery pack powered the circuit back by providing current through the voltage regulator to the relay, then to the 7805 and to the pic,etc. To prevent this back flow of current, I added a 1N4008 diode right before the battery pack. The problem is that the diode has now altered the Vdrop of the regulator and increased it by approximately 1V. Is there any way of fixing this apart from changing the diode to one with a smaller forward voltage drop?
I am using an Onsemi MC33269TG voltage regulator as a constant current source to charge a pack of NiMh batteries (12V). I found that on switching off the circuit's input the battery pack powered the circuit back by providing current through the voltage regulator to the relay, then to the 7805 and to the pic,etc. To prevent this back flow of current, I added a 1N4008 diode right before the battery pack. The problem is that the diode has now altered the Vdrop of the regulator and increased it by approximately 1V. Is there any way of fixing this apart from changing the diode to one with a smaller forward voltage drop?