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Pacific Transformer designs and manufactures a line of pre-designed guitar amp transformers that can be purchased directly through our ecommerce site, Pacific Audio Magnetics.

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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.

Get a Custom Quote About Us
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.

Keep Exploring

Explore More Custom Transformers

Parent Hub Custom Transformers The full range of custom magnetics we design and build — compare every transformer type in one place. Back to the hub
01 Current Transformers (CTs) Current transformers (CTs) for accurate metering, protection, and monitoring. 02 High-Frequency Transformers Compact, low-loss transformers for switch-mode and high-frequency power conversion. 03 Isolation Transformers Galvanically isolated, electrostatically shielded designs for clean, safe power. 04 PDU Transformers Power distribution unit transformers for data centers and critical power. 05 Pulse Transformers Fast-edge pulse transformers for signal coupling, gate drive, and timing. 06 Step-Down Transformers Voltage conversion for machinery, imported equipment, and OEM gear. 07 Step-Up Transformers Boost lower input voltages to the higher levels your equipment requires. 08 Three-Phase Transformers Three-phase transformers for industrial power, distribution, and high-load applications. 09 Toroidal Transformers Low-noise, high-efficiency cores for audio, medical, and instrumentation. 10 Voltage / Potential Transformers (VTs/PTs) Voltage (potential) transformers for safe, accurate high-voltage measurement. 11 Guitar Amp TransformersCatalog Parts Available Output, power, and choke transformers for guitar amps — stock or custom. 12 Distribution TransformersCatalog Parts Available Single and three-phase distribution units up to 750 kVA. 13 Padmount TransformersCatalog Parts Available Pad-mounted transformers for commercial and utility sites.

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

Aerospace

Defense

Defense

Medical & Dental

Medical & Dental

Automotive & EV

Automotive & EV

Audio

Audio

Conveyance Systems

Conveyance Systems

Industrial & Commercial

Industrial & Commercial

Power Quality & Measurement

Power Quality & Measurement

Alternative Energy

Alternative Energy

Data Center

Data Center

Utilities

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.

Get a Quote

A few questions in — a quote back in one business day.

Our quoting system walks you through your project one question at a time — voltages, quantities, application — and builds your drawings as you go. A PACTRAN applications engineer stands behind every quote.

1DAY

Quote turnaround

Pricing and lead time within 1 business day

2DAYS

Prototype turnaround

A wound, tested prototype in 2 business days

Prefer to talk it through? 800-325-0501

Start your quote

Takes about 5 min

We'll ask, for example

What input voltage does your design see?

  1. 01

    Describe your project. In your own words — give us what you know.

  2. 02

    Answer a few guided questions. We only ask what your quote needs.

  3. 03

    Get your quote. Pricing, lead time, and preliminary drawings — reviewed by an engineer.

Start My Quote No account needed. Free engineering review.