Hi,
I plan to use an AC adapter of +9V @ 2A as the main power source and step-up and step-down this power source to create few different voltage supplies (+12V, +3.3V and +1.8V).
My problem is should I be stepping down the +1.8V from the main power source of +9V or stepping down from the regulated +3.3V (which is first step-down from the +9V). This is because the voltage difference between +3.3V and +1.8V is only +1.5V while the voltage difference between the +9V and +1.8V is as high as +7.2V. I think there will be waste of energy for such a conversion, right?
How should I arrange it such that the power efficiency is optimum?
Thanks for any help in advance.
Regards,
eric
I plan to use an AC adapter of +9V @ 2A as the main power source and step-up and step-down this power source to create few different voltage supplies (+12V, +3.3V and +1.8V).
My problem is should I be stepping down the +1.8V from the main power source of +9V or stepping down from the regulated +3.3V (which is first step-down from the +9V). This is because the voltage difference between +3.3V and +1.8V is only +1.5V while the voltage difference between the +9V and +1.8V is as high as +7.2V. I think there will be waste of energy for such a conversion, right?
How should I arrange it such that the power efficiency is optimum?
Thanks for any help in advance.
Regards,
eric