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How to deal with 24v->3.3V LDO circuit?

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24v to 3.3v

How to deal with 24v->3.3V LDO circuit?
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Goal : input : +24V~~+30V
output: 3.3V , 80mA
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I plan to use "LM317" .
If I input the 24V directly to LM317's input,
then the efficiency is too low ( efficiency = Vout/vin = 3.3/24 =13.75% ),
So I want to use a pre-regulator circuit , which as




May the circuit work well ?
And how to calculate the Value of R ??

Thanks.
 

ldo circuit

Use cheap switching regulator MC34063 from motorola. it is better (for your purpose)
 

ldo 24v input

If you realy want to use LDO at last stage for better performance you can you a pre-regulator- a switching regulator to step down from 24V/30V to 3.6V or 4.2V then use a LDO to get 3.3V.
 

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