-48V power supply board design

[Laplace]

safety requirement for 48v supply

I need to design a -48V DC power supply board which takes 220V AC as input for telecom system.

Any schematic or suggestions?

Thanks....

 

[flatulent]

regulations and standards

There are numerous standards and government regulations for the parameters of such a supply and the type of parts it can use.

Meeting these parameters will be the hardest part of the design.

 

[jzo777n]

Re: -48V pero supply design

Some of the standards you must fulfil could be :
ETSI EN 300 132-1, 2, 3., Power supply interface at the input to telecommunications equipment;
ETSI EN 300 253, Environmental Engineering (EE); Earthing and bonding of telecommunication
equipment in telecommunication centres.
EN 41003, Particular safety requirements for equipment to be connected
to telecommunication networks".
ETSI EN 300 386-1,EMC requirements
…..

The ETSI standards could you find at https://www.etsi.org for download free of charge

And as usual EN60950, LVDS and more…

 

[goodboy_pl]

Re: -48V pero supply design

thank u jzo777n for the link!
but about your request:
what is the power level?
below 150W a flyback converter is a simple and low cost and stable solution.

what is the application?
a battery charger for telecom. systems or a power supply for stand alone com. system?
they differ in feedback and control ckt design; for the first one u need a current limit method but for second one it may be omitted.

PS: i will check if i have a sch. for it.

BEST!

 

[Moss]

Re: -48V pero supply design

If output power is small ( bellow 100w) I will sugest flyback based on MC3842 or 3844.. It is cheap and popular. Look at the datasheet for complete schematics.

 

[goodboy_pl]

Re: -48V pero supply design

someuseful info can befound in:
http://www.onsemi.com/pub/Collateral/SMPSRM-D.PDF

u must only change some component values to design your own SMPS or charger; here u can find some useful ckts.

for design and construction of the transformer, EMI related issues and choosing optocoupler/components see:

**broken link removed**
**broken link removed**

BEST!