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design for a Power Supply (Vin 60-70V, Voutput adj, 120ma

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Hi

I need to design some power supply with this characteristics:

Vin: 60-70V
Vout: Adj (3.3v..5v..10v)
Iout: 100..150 ma
Ignd: really low (as low as posible).

I have only 100 mW for all the circuit, and I need a power suppy with very very low Ignd (very power loss)

tia!
regards
 

Hi


Firt i think that you will need an isolated dc-dc power supply for that high voltage.(it posible that you need a second dc-dc regulator too,after you have a first low voltage from the high votage in).

you have some comp that make dc-dc converters

first option look on linear:
https://www.linear.com/prod/pft.html?product_family=power

chose switch-regulators/step-down/high-voltage-input(vin>=36)
and you get some regulators

some example :
https://www.linear.com/pdf/1725f.pdf


second option maxim
**broken link removed**

Best regards.
 
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Vishay-Siliconix is a good alternative for high input voltages (so-called Telecom voltages)

See for example Si9117, and several other possibilities - depending on features needed:

**broken link removed**

Good luck,

Ted
 
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