PRODUCTS > FLYBACK TRANSFORMERS

Custom Flyback Transformers, Built for Your Converter

Pacific Transformer designs and builds custom flyback transformers for switch-mode power supplies — gapped ferrite cores, single or multi-output secondaries, wound to your turns ratio, gap, and leakage inductance targets. From a single prototype to 10,000+ unit runs.

Free engineering designs. Quotes in 24 hours. Prototypes in 48. Catalog pricing on custom work.

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Custom flyback transformers for switch-mode power supplies

Wound to Spec

Flyback Transformers, Wound to Spec

A flyback transformer is really a coupled inductor: it stores energy in a gapped core while the switch is on and releases it into the secondary when the switch turns off. That makes it the workhorse of low- and mid-power isolated converters — and it makes the gap, turns ratio, and leakage inductance the difference between a design that runs cool and one that never gets through EMI testing.

We wind single-output and multi-output flybacks from a few watts up to roughly 250 W, for switching frequencies from 20 kHz to 500 kHz, with the isolation, bobbin, and footprint your board requires. Send us the controller, the input range, and the outputs — our engineers spec the rest for free, and every unit is individually tested before it ships.

Send us your specs

Typical Specifications PTC-FB

Configuration Single- & multi-output

Voltage Range Inputs to 1000 VDC; multi-output secondaries + custom

Design Types Gapped ferrite, isolated, multi-winding

Power Range A few W up to ~250 W

Switching Frequency 20 kHz to 500 kHz

Order Quantity No minimums, no maximums

500kHz

Max Switching Frequency

4kV

Primary–Secondary Isolation

250W

Power Handling

0MOQ

No Minimums, No Maximums

Applications

Where Flyback Transformers Are Used

Wherever an isolated converter has to deliver several rails from one small magnetic — on the board, not in the cabinet.

Switch-Mode Power Supplies

Isolated AC-DC and DC-DC supplies where one magnetic has to produce several regulated rails.

EV & Battery Charging

Bias and auxiliary supplies riding on high-voltage DC buses, with the isolation to match.

Industrial Electronics

Drives, instrumentation, and control boards that need compact isolated power on-board.

Standby / Aux Power

Low-power always-on rails for housekeeping, gate drive bias, and control logic.

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Industries Served

From NASA payloads to guitar amplifiers, Pacific Transformer's custom magnetics power some of the most demanding applications in the world. Our engineering team has deep experience across industries where compliance, performance, and reliability aren't optional — they're required.

Aerospace

Defense

Medical & Dental

Automotive & EV

Audio

Conveyance Systems

Industrial & Commercial

Power Quality & Measurement

Alternative Energy

Data Center

Utilities

FREQUENTLY ASKED QUESTIONS

Flyback Transformers

A flyback transformer stores energy in its gapped core during the switch-on period and delivers it to the secondary when the switch turns off. Unlike a conventional transformer, primary and secondary currents never flow at the same time — which is why it is described as a coupled inductor rather than a true transformer.

Yes. Multi-output secondaries are one of the main reasons designers choose flyback topology, and we regularly wind three, four, or more outputs on a single core with the cross-regulation and isolation you specify.

We wind flybacks for switching frequencies from 20 kHz up to 500 kHz. Above roughly 100 kHz the winding strategy matters more than the core — we use the wire construction and interleaving that keeps AC losses and leakage inductance under control at your frequency.

No — no minimums and no maximums. We build from a single prototype through full production runs, with free engineering and a working prototype typically in 48 hours.

Send Us Your Specs

Specs in — a quote back in 24 hours.

Tell us what you're building. A Pacific Transformer applications engineer reviews every request and responds with pricing and lead time — no forms routed to a sales queue.

24HR

Quote turnaround

Pricing and lead time within 24 hours

48HR

Prototype turnaround

A wound, tested prototype in 48 hours

Prefer to talk it through? 800-325-0501

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