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Linear power supply

What is a linear power supply? Our range


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How does it work?


A linear power supply is an electronic system that converts mains voltage into a stable and reliable direct current voltage, suitable for electronic equipment. It operates through a chain of simple and robust components: a transformer that steps down and isolates the voltage, diodes that rectify the current, capacitors that smooth out variations, and finally a linear regulator that precisely stabilizes the final voltage.

A linear regulator is an electronic component made up of a power element, a voltage reference, and a control circuit, which continuously adjusts the voltage by dissipating excess energy in order to provide a perfectly stable and low-noise output.

This operation without high-frequency chopping allows for a very clean power supply, with a low level of electrical noise, making it a solution particularly suited for sensitive applications and systems requiring reliability and stability..


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Principle diagram of a linear power supply

Schematic diagram of linear power supply
Industrial linear power supplies (also called series regulated linear power supplies) are presented in the form of high-reliability mini-modules powered by the mains, with maximum thermal dissipation homogenized by epoxy molding.
  • Encapsulated, the series regulated linear power supply becomes a simple, compact, tropicalized, isolated component, insensitive to humidity, dust, and vibrations.
  • 90 basic models, Mono, Double, Triple sources, with fixed or adjustable voltage, provide 3 to 48V (0 to 500V on request), from 0.6W to 24W.
  • 29 common options multiply the possibilities of these power supplies.
  • In standard version, the housings are equipped with 2 M3 inserts and 1mm pins for mounting on printed circuit boards.
  • Other versions are available on request, please consult us.

Input voltage :

230 VAC ±10% / 50 to 400 Hz

Output voltage : 

  • “Fixed” version: at 1% of nominal Vs (at 20°C)
  • “Adjustable” version: with INCORPORATED adjustment

Series regulation :

  • 230 VAC varying ±10% : < 10-3 of Vs
  • load varying from 0 to max
  • 4.10-3 of Vs for 6 V model
  • 2.10-3 of Vs for model > 6 V

Response time :

< 30 µs

Residual ripple : 

< 1 % of the nominal output voltage (< 0.1 % in fully linear technology)

Dielectric strength input/output: 

2000 V rms at 5 mA

Isolation input/output: 

100 Mohms at 500 V

Output current:

Built-in adjustment (10-turn shaft) on the "1 SR" series with a perfectly rectangular characteristic, from zero to nominal i, with the voltage also adjustable from > 1 V to the nominal voltage

Protections:

  • Overloads and short circuits: rapid current limitation
  • Against excessive temperature rises: automatic and progressive current limitation, first disconnection afterwards
  • Sealing: IP67 (excluding connections)
  • Optional external fuse, delayed

Thermal characteristics:

  • Storage: -40°C to +85°C
  • Operation: -30°C to +70°C with a current reduction of 2% per degree from 45°C, 50°C for metal case version
  • Temperature coefficient: 2.10-4 of Vs per degree

Mountings:

Different enclosures available:

  • Wall mounting with 2 M3 metal inserts on the surface 89 X 64 mm and 4 metal inserts for 100 X 100 enclosures
  • Pin for printed circuit board
  • Faston terminal block
  • DIN rail