Re: Zener diode regulator?
Jim,
you are not understanding what John is telling you....
If you start at 80 Volts and drop to 12 Volts, thats a drop of 68
Voltss. If you deliver 1 Amp then the resistor or regulator that is
dropping the voltage will dissipate 68 Watts. The regulator will
dissipate 68 Watts, not the load...
The ONLY way around this problem is to use a switching type power
supply which is more complex but there are some simple ones out there.
They work by "transforming" the power instead of just wasting it.
Lookup up "buck switching regulator"
If you really only need 100mA instead of 1 Amp, then your regulator
will dissipate 6.8 Watts which might be managable for you but probably
not in an SMT part.
Mark
.
Relevant Pages
- Re: AC->DC converter question
... Use a 7805 for the 5 volts, ... and power only one regulator at a time, ... I'd drop the voltage between the wall wart and the ... that would be about .96 watts ...
(sci.electronics.design) - Re: Low noise DC/DC converter
... Check in the manual for the max DC voltage: 10 volts will dissipate ... watts. ...
(sci.electronics.design) - Re: Zener diode regulator?
... If you deliver 1 Amp then the resistor or regulator that is dropping the voltage will dissipate 68 Watts. ...
(sci.electronics.design) - Re: Voltage shedding question
... caps and the regulator. ... since it'll be dissipating 10 watts at an amp - will drop ... regulator will only have to dissipate 3 watts. ...
(sci.electronics.basics) - Re: Altair Questions
... resistors is too high for them to have any significant effect. ... won't draw much power away from the regulator). ... needs 1.5 amps from a single regulator, that is 6 watts, which is more ... amps and dissipate 2.84 watts, leaving the regulator to "only" pass .79 ...
(comp.os.cpm) |
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