| ??? 01/12/06 18:20 Read: times |
#107191 - Regulation Responding to: ???'s previous message |
Kai Klaas said:
But this simple formula is only valid for very strong transformers, which do not show relevant ohmic resistance of secondary winding, and if the nominal load is drawn from the transformer. But in reality the finite transformer impedance leads always to a lowering of output voltage of up to some volts under nominal load. This "strength" is called the regulation of the transformer and is expressed as a percentage from open circuit to fully loaded. So, a 5000µF storage cap for a 100mA application is highly overdimensioned. Also remember that the regulator can do a lot, provided the supply at the cap doesn't drop below the regulators ability to adjust it. Use it. Steve |
