Voltage converters for every application

A DC/DC voltage converter is an electrical circuit that converts one direct current (DC) voltage to another direct current (DC) voltage by transferring energy from a power source to a load. There are essentially two basic types of DC/DC converters: buck and boost.

Buck converter vs boost converter

A buck converter lowers the input voltage to a lower output voltage. The input voltage is applied to a coil that is switched on and off perio­dically with a switch. The switching on and off of the switch generates an alter­nating voltage, which is smoothed to the output voltage by a capacitor. The frequency of the switch deter­mines the efficiency of the converter.

A boost converter, on the other hand, increases the input voltage to a higher output voltage. In this case, the switch is switched differently: The input voltage is applied to a coil, which is periodically charged and discharged by the switch. In the process, a higher output voltage is generated by passing the voltage via a capacitorr into a load resistor.

There are also other types of DC/DC converters, such as the buck-boost converter, which can produce both a higher and a lower output voltage. However, all these con­verter types have in common that they use energy transfer from one DC voltage to another by using switches and coils or condensers.

Efficient use of the converter with the right frequency

The recommended frequency for a DC/DC voltage converter depends on various factors, such as

  • type of converter,
  • power
  • efficiency
  • size of components
  • application in which the converter is used

In general, a higher frequency is advantageous as it allows for smaller components and increases the efficiency of the transducer. For most applications, fre­quences in the range of a few 10 kHz to a few MHz are recom­mended. A typical value for modern DC/DC converters is about 1 MHz. However, higher frequencies can also result in higher switching losses, which can lead to reduced efficiency.

The choice of frequency can also be influenced by other factors such as electro­magne­tic inter­ference (EMI) and noise. In some applications, therefore, a lower frequency may be more advantageous to mini­mise these problems.

Therefore, it is important to know the requirements and limitations of your specific application before choosing a frequency. We can advise you on this!

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DC DC Converter - TOPPOWER


DC DC Converter - TOPPOWER

DC-DC Converter


  • Isolated Unregulated & regulated DC/DC
    0.1W - 3W
    SIP Types | SIP/DIP Types
    Input: 3.3V - 15V
  • Isolated Regulated DC/DC
    1W - 50W
    SIP Types | DIP Types
  • Non-Isolated DC/DC
    0.5A - 2A
    Input: 12V / 24V


  • Automation
  • Power Grid
  • Smart Home
  • Regenerative Energies
  • ITK, Measurement
  • Transport/Traffic
  • Military, Security

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TOPPOWER AC DC voltage converter

AC-DC Converter


  • AC/DC On board regulated
    DIP Small Volume Type (1W - 20W)
    DIP Highly Reliable Type (3W - 30W)
  • AC/DC Enclosed & open frame (25W - 1200W)
  • AC/DC DIN rail (15W - 480W)


  • Automation
  • Power Grid
  • Smart Home
  • Renewable Energy
  • ITK, Measurement
  • Transport/Traffic
  • Military, Security

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Who can place an Order with us?

All those who have registered a trade. We supply to large customers as well as medium-sized companies, small busi­nesses and engineering offices. Schools, colleges, univer­sities and public institu­tions are also provided with technical advice and supplies. Depen­ding on the purchase quantity and product, we grant staggered prices that can vary on a daily basis. Ask us for an indivi­dual offer.

Do I have to order online in the shop?

No, you are also welcome to request an individual offer. The ordering option at is particularly suitable for smaller quantities. The WEBSHOP is to be understood as an additional service offer where you can get a quick overview of availability, delivery times and prices. Furthermore, with its filter and search function, the shop also offers a quick overview of the different variants, designs, voltages, currents. Our stock in Freiberg am Neckar (South West of Germany) is well stocked for the common types. Provided that our suppliers accept it, special solutions are also offered here. In this case, we recommend that you ask us about delivery times.

What can you expect from CAPCOMP?

Competitive, fair pricing and clear communication are our top priorities. We thrive on long-term customer relationships. That is why we take great care to answer your questions and concerns in a professional and impeccable manner. The quality of CAPCOMP's advice and sales performance is highly valued by our industrial customers. Your success is our success.

Where can I get current certificates from the manufacturers?

You can obtain the current certificates of the manufacturers directly on request via our info form. Due to the enormous amount and variety of product and company certificates, we do not want to make your selection unnecessarily difficult. Simply let us know which documents for which manufacturer and/or product you require. We will send you the requested documents directly.


QS/QM, Health & Safety, Certificates of Conformity, Compliance and Environmental Certificates

  • ISO 9001:2015
  • ISO 14001:2015
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  • et al
Why are components like ultracaps called different names?

The variety of terms is explained by the English-language terms commonly used in the electronics industry, which are often mixed with German terms or used synonymously. In some cases, manufacturers have also introduced artificial terms to better distinguish themselves from competitors. Here are the most important examples:

Double layer capacitors (DSK) are referred to synonymously as:

  • EDLC (Electric Double Layer Capacitor)
  • Supercapacitors = Supercaps
  • Ultracapacitors = Ultracaps
  • Goldcap™ [Panasonic]
  • Boostcap™  [Maxwell]
  • Greencap™  [Samwha]
  • PURIXEL™  [Pureechem] for supercap cells
  • PURETRON™  [Pureechem] for supercap modules

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