What is the simplest and most efficient way to reduce ±60V to ±15V?

[zergxia]

Dear friends, I need some help. What is the easiest way to reduce ±60V to ±15V with sufficient performance?

I initially plan to use LM317 tracking preregulator circuit and add TVS diodes for clamping protection. Doing so can meet the requirements while getting the powerful performance of LM317 and is relatively simple, but there are some problems that have not been resolved:

1. At the moment of starting, due to the need to charge the load capacitor, the load will be exposed to a dangerous environment far exceeding ±15V.and the LM317 is easily damaged. If I use 30V TVS diodes on each LM317 and connect 17V TVS diodes in parallel to the output port, can I effectively protect the load from overvoltage damage?

2. At present I know that LM317 can make a tracking preregulator circuit to achieve a voltage drop of 50-60V. So, can LM337 corresponding to LM317 make negative voltage tracking preregulator circuit?

3. I considered using LM783, but it does not have a negative voltage LDO.Are there other more concise high-performance positive and negative voltage regulator circuits?

thank you all!：D

[kokoriantz]

First bring down by switching converter to +/- 20v, than apply linear regulator.

[picowallspeaker]

Good old R+Zener diode
About 1k5 Ω and 15 V Zener

[zergxia]

Originally Posted by kokoriantz

First bring down by switching converter to +/- 20v, than apply linear regulator.

Positive and negative voltage; 400mA current; low-noise switching converter.
Is there a specific model recommendation?
Is the high frequency noise as low as that of a linear regulator?
Thank you ！

[bansuri]

You need a preregulator to lower the regulator input voltage, it is above the specs.
How much current is required at 15V?
prereg.png
This is good to 200mA, it gives 23V out

[jan.didden]

It all depends on the current levels those supplies have to deliver.
Without knowing that you can't give an intelligent answer.

Jan

[00940]

Originally Posted by zergxia

Positive and negative voltage; 400mA current; low-noise switching converter.

45*0.4= 18W per rail of wasted energy if you go for a linear solution, so yes a switching solution is the way to go.

The easy but not cheap way is to use two isolated dc-dc converter such as the SPB09C-15 from Meanwell. 36 to 75v input, 15v@600ma output. But about 15$ each... Follow that by a CLC filter.

[vacuphile]

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and many more options if you look

[JMFahey]

Originally Posted by zergxia

Dear friends, I need some help. What is the easiest way to reduce ±60V to ±15V with sufficient performance?

WHAT-IS-THE-LOAD-CURRENT?

I initially plan to use LM317 tracking preregulator circuit and add TVS diodes for clamping protection.

Are you asking for a solution or confirmation on your already decided plan?
We lack important data.
And not sure about your "clamping" either.

Doing so can meet the requirements while getting the powerful performance of LM317 and is relatively simple, but there are some problems that have not been resolved:

????????

1. At the moment of starting, due to the need to charge the load capacitor, the load will be exposed to a dangerous environment far exceeding ±15V.

No.
If anything, load will be *under* volted until any capacitor across it charges.

and the LM317 is easily damaged. If I use 30V TVS diodes on each LM317 and connect 17V TVS diodes in parallel to the output port,

can I effectively protect the load from overvoltage damage?

Which overvoltage?

2. At present I know that LM317 can make a tracking preregulator circuit to achieve a voltage drop of 50-60V. So, can LM337 corresponding to LM317 make negative voltage tracking preregulator circuit?

3. I considered using LM783, but it does not have a negative voltage LDO.Are there other more concise high-performance positive and negative voltage regulator circuits?

You are running too fast for us to catch up , please supply full details on your load requirements first.

And welcome to the Forum

[gmphadte]

Where do you get your 60 volts from...is it a transformer.
Why not use another transformer.

gajanan phadte