| ??? 12/01/09 16:07 Read: times |
#171343 - It's a matter of definition Responding to: ???'s previous message |
Per Westermark said:
Minimalistic approach, since any more intelligent chip also having logic-level control inputs will always make you notice the logic-level VCC and miss the point of the constant current regulator actually regulating the current. Also without any adjustable resistor, since any adjustable resistor will directly be misinterpreted as a voltage regulator.
http://news.thomasnet.com/pdf/826992.pdf Just about the first thing it says is "Ireg(SS) = 20 mA@ Vak = 7.5 V" Doesn't that tell you that the supply voltage is critically involved in setting the current? Erik's assertion is that it's possible to generate a constant current without any input supply regulation. He implied that there's a current source that will provide a constant current despite the fact its input supply ranges randomly between 3 and 24 volts. That's where I challenged him to show us how it works. All he's referred to since then has been current sinks that are influenced considerably by the supply voltage. I just want to know what he means. RE |
