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Switch Mode Power Supplies

Bobbins cores and complete transformers for offline and DC to DC switching converters.

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Switch Mode Power Supplies components from CB Magnetics

What Goes Wrong In This Segment

The four problems that come up most often on enquiries from this market.

Footprint locked before the sample arrives

A layout cannot be finished while the pin pitch and row spacing of the former are still unknown.

Plastic that fails the solder profile

A thermoplastic body that softens in a wave or a solder pot costs a whole build.

Three suppliers for one component

Former from one place, core from another, winding from a third, and three tolerance stacks to reconcile.

A size change becomes a supplier change

Moving from EF to ER late in a project should not restart qualification.

What buyers need instead. Published geometry, a plastic rated for the process in use, and one source that covers the whole core series.

Ranges That Fit

Transformer Bobbins and Hardware

Transformer Bobbins and Hardware

Bobbins for EE EF EFD ER ETD PQ EPC and RM core sets

Magnetic Core Materials

Magnetic Core Materials

Tape wound cores where ferrite loss or saturation is the limit

Transformers

Transformers

Complete switching transformers wound to your electrical specification

Typical Applications

  • Offline flyback and forward converters in adapters and industrial supplies
  • DC to DC converters on control boards
  • Auxiliary supplies inside larger equipment
  • Filter inductors and common mode chokes on the input stage

How A Project Runs

  1. You send a drawing a reference design or a part list
  2. We check it against tooling we already own
  3. Material pin geometry and electrical values are confirmed in writing
  4. Samples from an existing tool, or a tool is cut for a new geometry
  5. Dimensional and electrical checks before shipment

See the plant that does this

Recommended Parts

Published parts from the range most used in this segment.

PQ2008 Vertical bobbin with 8 Pins - CB MagneticsPQ2008 Vertical bobbin with 8 Pins4+2+2 pinsPhenolicP 3.0/4.5/6.45mmPQ2016 Bobbin, 6+8 Pins, 1 Section - CB MagneticsPQ2016 Bobbin, 6+8 Pins, 1 Section6+8 pinsPhenolic, Pin Material: CPQ2016 Vertical Bobbin 4+6 Pins - CB MagneticsPQ2016 Vertical Bobbin 4+6 Pins4+6 pinsPhenolicP 2.5mmPQ2016 Vertical bobbin with 8 Pins - CB MagneticsPQ2016 Vertical bobbin with 8 Pins6+2 pinsPhenolicP 3.8/4.95mmPQ2020 Bobbin, 6+8 Pins, 1 Section - CB MagneticsPQ2020 Bobbin, 6+8 Pins, 1 Section6+8 pinsPhenolic, Pin Material: CPQ2620 Bobbin, 6+6 Pins, 1 Section - CB MagneticsPQ2620 Bobbin, 6+6 Pins, 1 Section6+6 pinsPhenolic, Pin Material: CPQ2621 Vertical Bobbin with 12 Pins - CB MagneticsPQ2621 Vertical Bobbin with 12 Pins6+6 pinsPhenolicP 3.8/7.6mmPQ2625 Bobbin without Pins - CB MagneticsPQ2625 Bobbin without PinsPhenolicPQ2625 Bobbin, 6+6 Pins, 1 Section - CB MagneticsPQ2625 Bobbin, 6+6 Pins, 1 Section6+6 pinsPhenolic, Pin Material: CPQ2625 Vertical Bobbin with 4 Pins - CB MagneticsPQ2625 Vertical Bobbin with 4 Pins2+2 pinsPhenolicP 7.62mm

View the full range

Related Reading

Bobbin Series GuideMaterial GuidePin and Footprint Guide

Questions From Switch Mode Power Supplies Buyers

Which parts do you supply into switch mode power supplies

Bobbins for EE EF EFD ER ETD PQ EPC and RM core sets; Tape wound cores where ferrite loss or saturation is the limit; Complete switching transformers wound to your electrical specification.

Can you build the whole wound component

Yes. The former the core and the winding can come from one bill of materials and be quoted as a finished part.

What if the core shape I need is not listed

Send the drawing. Tool design and injection moulding are in-house services, so a new geometry is a tooling job.

Do you hold quality certification

ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018. All products are RoHS compliant.

How are prices set

Per part and per quantity. Send a part list or a drawing with annual volumes.

Send The Specification

A reference design a drawing or a part list is enough to start. Engineers reply, not a call centre.

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