Custom SMPS & Switch-Mode Transformers
Switch-mode supplies live or die on the magnetics. P&A International engineers, prototypes and delivers custom SMPS transformers on EE/EF/ETD/EFD/RM/PQ ferrite cores — flyback, forward, push-pull, half/full-bridge and LLC topologies, 1 W to 3 kW, 20 kHz to 1 MHz+ — built to your schematic, target cost and compliance requirement.
As an engineering-led contract manufacturer founded as an engineering consultancy, we assign one dedicated engineer to your project from DFM review to qualified samples in 10–15 working days, then scale into volume through our vetted partner-factory network, where every supplier is ISO 9000 certified or better.Request a quote ›
consultancy + manufacture
per project, end-to-end
qualified samples with test data
every supplier certified or better
one-off to high volume
Why choose PA SMPS transformers
All topologies
Flyback, forward, push-pull, half/full-bridge and LLC — designed for your converter and switching frequency.
Low leakage & loss
Interleaved, sandwiched windings cut leakage inductance and AC/proximity loss for efficiency and EMI.
Safe isolation
Reinforced or triple-insulated wire, creepage/clearance to IEC 62368-1 / 61558, CE and UL as specified.
Built to your spec
EE/EF/ETD/EFD/RM/PQ cores, bobbins and potting selected and DFM-reviewed for your design.
Engineering capability
- Magnetic design & simulation — turns ratio, leakage inductance, core loss, AL, thermal modelling
- Core grade selection for power density and loss at your frequency
- Winding strategy — interleaving / sandwiching — for leakage and AC resistance
- Safety construction — reinforced / triple-insulated wire; creepage/clearance to IEC 62368-1 and 61558
- DFM review to hit target cost while preserving performance
- Built-to-spec compliance (CE / UL / IEC as specified)
- Qualified samples with full test data before any volume tooling
- One dedicated engineer owns the project end-to-end
At a glance
| Cores | EE / EF / ETD / EFD / RM / PQ / planar |
| Power | 1 W – 3 kW |
| Frequency | 20 kHz – 1 MHz+ |
| Topologies | Flyback, forward, push-pull, half/full-bridge, LLC |
| Isolation | To CE/UL/IEC 62368-1; reinforced insulation available |
| Prototype | 10–15 working days to qualified samples |
| Quantities | One-off prototypes to high volume |
| Quality | Every supplier in our network is ISO 9000 certified or better |
Why engineers & buyers choose PA
For design engineers
A true design partner — one dedicated engineer, full magnetic simulation and DFM support, rapid samples, and SMPS transformers optimised for efficiency, leakage, thermal and EMI. We routinely target leakage-inductance reduction and first-pass DFM approval on LLC resonant converters — not just off-the-shelf parts.
For purchasing
Low-risk scalability — predictable 10–15-day prototypes, flexible MOQ from one-off to production, target-cost DFM, a single point of contact, and a vetted ISO 9000+ partner network managed end-to-end by P&A. No hand-offs, no surprises.
3 easy steps to get started
Send us your spec
Send your drawing or spec sheet. One dedicated engineer reviews it and confirms the technical details with you.
Proposed design & quote
You receive a proposed design and indicative pricing — typically within 48 hours — to review and refine together.
Samples & production
Qualified samples with full test data in 10–15 working days; on approval we scale into volume through our partner network.
Applications
AC-DC & DC-DC power supplies · chargers and adapters · industrial and renewable power · telecom and data infrastructure · LED drivers · energy storage and battery management.
Explore related types: high-frequency & switch-mode magnetics, planar and LAN & signal transformers.
Choosing the right switch-mode transformer
A few decisions shape every SMPS design — sharing this detail lets us quote and prototype faster:
| Topology first | Flyback for low-power isolated rails; forward for mid-power; push-pull, half- and full-bridge for higher power; LLC for soft-switching and high efficiency. Topology, frequency and I/O voltages set the core and winding. |
| Core & material | EE/EF/ETD/EFD cover most SMPS work; RM and PQ give compact, low-EMI designs; planar suits low-profile high-density. Ferrite grade balances loss, saturation and cost at your frequency. |
| Leakage & efficiency | Interleaving and sandwiching control leakage and AC/proximity loss, which drive efficiency, snubber design and EMI. We model and minimise it. |
| Thermal headroom | Temperature rise comes from core and copper loss; we select bobbin, wire gauge (incl. litz) and potting to stay in your thermal limit. |
| Isolation & safety | Creepage/clearance, reinforced or triple-insulated wire and compliance to IEC 62368-1 / 61558, CE and UL designed in from the start. |
What to send us for a fast, accurate quote
The more of this you can share, the quicker we can return a proposed design and price:
- Schematic or topology, plus switching frequency
- Input/output voltages, currents and power (turns ratio if known)
- Isolation and safety requirements, and target standards
- Mechanical envelope — height, footprint, mounting — and thermal limits
- Target cost and annual volume or call-off pattern
- Any reference design, competitor part number or physical sample
Working from a competitor part or a sample is fine — our engineer will reverse-engineer it or design a drop-in equivalent to your specification.
📄 Download the SMPS transformer RFQ checklist & core-selection quick reference (PDF)
Get a quote
Send your schematic, switching frequency, voltages and spec sheet and one dedicated engineer will reply — typically within 48 hours — with a proposed design and indicative pricing.
One dedicated engineer reviews every enquiry and replies with a proposed design and indicative pricing. Your details are used only to respond to your enquiry. Prefer email? support@pa-international.com.au