The 22 switching transformers featured in this collection were designed for use with Integrated Circuit (IC) chips developed and made by Power Integrations™. Tailored specifically for this purpose, these SMPS transformers have been optimized for use in applications related to these IC chips. However, these high-frequency, ferrite core transformers have value in many other applications as well. Our expert team can also provide switching transformer winding services to meet your exact specifications; request a quote today.
What is a Switching Transformer?
Switching transformers are also known as SMPS (switch mode power supply) transformers, or switch mode transformers. The highly efficient SMPS transformer converts electricity, making AC or DC current usable by ensuring it’s the correct voltage for the application.
Switching transformers are very commonly used in electronics to transform AC voltage to DC. They’re often found in laptops, smartphones, computer devices, power sourcing applications, and more.
How SMPS Transformers Differ from Linear Transformers
SMPS transformers have various benefits that differentiate them from typical transformers.
- Switching transformers tend to operate at higher frequencies than traditional transformers. Many of these high frequency transformers operate between 10 kHz and 1 MHz.
- SMPS transformers are highly efficient, which means they experience reduced overall losses.
- SMPS transformers tend to be smaller in size and lower in weight than many other transformers. For many applications in need of a switching transformer, size is key. Smaller SMPS transformers can save space and reduce costs for manufacturers.
Switching Transformers for IC Chips
Prem Magnetics originally started to develop switching transformers for Power Integrations™ IC chips in 2002. We built three series in this range, starting with the SPP-3000 Series, followed by the SPP-4000 Series, and finally the SPP-4100 Series.
The IC chip transformers in all three series are still used today in a variety of applications, even with alternative chips. Browse all three series to find the ferrite core transformer that best meets your needs or contact us for more information.
Our IC Chip Transformer Series
You’ll find three subcategories of switching transformers for IC chips available with Prem Magnetics. This overview will help you navigate to the series that’s best for your application.
The SPP-3000 Series
The SPP-3000 series features PC through-hole SMPS transformers with a Circuit V input of 85-265 Vac, circuit power output of between 2.0W max and 5.5W max (depending on the switch mode transformer chosen) and Tfmr HIPOT of 4K Vrms Primary - Secondary .
Application description: AC to DC converter
Product Usage: Low power off-line switchers
Power Integrations™ chip part numbers: TNY253, TNY254 and TNY255
The SPP-4000 Series
Browse the SPP-4000 Series for PC through-hole switching transformers with a Circuit V input of 85-265 Vac, and 90-265 Vac, circuit power output of between 2.0W-80W max (depending on the transformer chosen) and Tfmr Hipot of 3K Vrms (primary to secondary(ies)).
Application description: AC to DC converter, AC to DC flybacks and switch mode transformers.
Product Usage: Enhanced eco-smart off-line switchers, notebook adapters and chargers, ink jet printers, constant voltage power adapters and cell phone chargers.
Power Integrations™ chip part numbers: TOP258PN, TOP256PN, TOP258EN, TOP259EN, TNY255EN, TNY256EN, TOP258MN, LNK362P, LNK363P
The SPP-4100 Series
Choose a switch mode transformer from the SPP-4100 Series for a PC through-hole or surface mount solution with a Circuit V input of 36-75Vdc (PoE+), 36-75Vdc (PoE) or 38-75Vdc. Power outputranges from 33W to 70W depending on the switching transformer chosen.
Hipot of 1.5KVdc primary(ies) to secondary(ies) & core or winding to winding & core.
Application description: These essential parts act as forward converters, coupled inductors, DC-DC forward converters, and switch mode transformers.
Product Usage: SMPS transformers in the SPP-4100 Series are found in various products, including: 33W DC-DC converters for satellite receivers, as L6 inductors for satellite receivers, in PoE and PoE+ and telecom applications.
Power Integrations™ chip part numbers: DPA425R, DPA426RN, DPA426R.
Custom Switching Transformer Design & Engineering
Prem Magnetics offers custom winding services for engineers looking for tailored switching transformer solutions. Our expert team is available to consult with you to create original switch mode transformer designs, or we can build new SMPS transformers based on your designs. We build prototype and production switching transformers, acting as a one-stop shop to ensure a smooth process to market.
Looking for Ferrite Core Transformers?
If you’re looking for ferrite core transformers you’re also in the right place; the high operating frequency of a sharp square wave nearly always requires the use of a ferrite material. We can provide the ferrite core transformer you’re looking for, made to your exact specifications.
Request a quote for SMPS transformers with output ratings, form factors, insulation, and mounting styles that meet your exact specifications.
SMPS Transformer FAQs
Below, we answer some of the most commonly asked questions about SMPS transformers.
What are the advantages of SMPS transformers?
SMPS transformers are smaller in size, generate less heat, highly efficient, and have excellent voltage regulation.
What applications are SMPS transformers suitable for?
SMPS transformers are commonly found in electronics and medical devices that require a small, lightweight solution to voltage conversion.
What should I consider when choosing an SMPS transformer?
To ensure you choose the right switching transformer for your application, be sure to consider the voltage conversion requirements, the switching frequency, compliance needs, and more key specifications. Please call our team for personalized advice.