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+12V from +60VDC? How to Do it?

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UroBoros

UroBoros

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I need to derive a +12VDC @ 1.5 Amps.

My input is between 40VDC to 60VDC. I am looking for info about some switching regulator circuit plus info.

LM2576 was the first choice, but the HV version is not available here.

Please suggest some other options.

Thanks

Regards
PICSTUDENT
 

use a pwm controller / regulator + flyback.

fairchild has tons of such devices.
 

    UroBoros

    UroBoros

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Thanks for the info. Will search

btw will the following setupp work




Thanks
 

Try charge pumps
 

Hai,
Use simple series regulator using high volatge transistor to drop down the volatge. Then force this voltage into proper 12 volts regulator like LM series.
 

    UroBoros

    UroBoros

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harii74 said:
Hai,
Use simple series regulator using high volatge transistor to drop down the volatge. Then force this voltage into proper 12 volts regulator like LM series.
Click to expand...

Will this method cause much power wastage and heat generation? I have to use this to monitor the voltage level from a battery pack. So wastage to be avoided if possible!

Please give little more details.
 

Hi Picstudent,
Can you get the HV version of LM317 (LM317HV)? It can be configured as switching regulator as shown in the datasheet. Also, the bonus in the app example is higher current handling capability with external driving element.
 

    UroBoros

    UroBoros

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Hello!

The LM317 seems to be a plain linear regulator, otherwise there would be at
least one coil in the typical applications. In this case, if you
drop the voltage from 60 to 12, you will mostly generate heat.

rad20 said:
Hi Picstudent,
Can you get the HV version of LM317 (LM317HV)? It can be configured as switching regulator as shown in the datasheet. Also, the bonus in the app example is higher current handling capability with external driving element.
Click to expand...

Why not directly searching in Digikey products?

If you search for PWM voltage regulators, you can set all the selection conditions
you want.

Dora.

Picstudent said:
Will this method cause much power wastage and heat generation? I have to use this to monitor the voltage level from a battery pack. So wastage to be avoided if possible!

Please give little more details.
Click to expand...
 

    UroBoros

    UroBoros

    Points: 2
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The LM317 seems to be a plain linear regulator, otherwise there would be at
least one coil in the typical applications.
Click to expand...

You may find examples of LM317 being used as switching regulator in the datasheet here **broken link removed**. Go to page 9 of the doc, 2 examples given.
 

    UroBoros

    UroBoros

    Points: 2
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Hello!

Tanks for the info. I didn't know it could be used a switching device. I'll spend
some time to understand how it works!

Dora.

rad20 said:
The LM317 seems to be a plain linear regulator, otherwise there would be at
least one coil in the typical applications.
Click to expand...

You may find examples of LM317 being used as switching regulator in the datasheet here **broken link removed**. Go to page 9 of the doc, 2 examples given.
Click to expand...
 

    UroBoros

    UroBoros

    Points: 2
    Helpful Answer Positive Rating
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