What is the relation between the input and output current of a generic efficient ( not just a zener diode) DC voltage stablizer ie: If the input voltage equals 15 V the stabilized voltage equals 12V and the output current equals 2A whats the input current of the stabilizer? Does the input current decrease with input voltage ?
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\$\begingroup\$ Have a look on this question/answer. \$\endgroup\$Bence Kaulics– Bence Kaulics2015-06-13 14:40:21 +00:00Commented Jun 13, 2015 at 14:40
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For linear regulators (such as 78xx, LM317) the input current is equal to the output current, plus a little bit to power the regulation circuit.
For a switch mode regulator, the power input is equal to the power output plus a little for regulator inefficiency.
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\$\begingroup\$ Short and sweet; +1. \$\endgroup\$EM Fields– EM Fields2015-06-13 18:22:57 +00:00Commented Jun 13, 2015 at 18:22