Custom Switch-Mode Power Supply (SMPS) Design
Efficient, compact power starts with the right switch-mode design. P&A International engineers, prototypes and delivers custom SMPS — AC-DC switching supplies, on-board SMPS, DC-DC converters and USB-PD — built exactly to your input range, outputs, efficiency and safety-compliance requirement.
As an engineering-led contract manufacturer founded as an engineering consultancy, we assign one dedicated engineer to your project from design 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.
consultancy + manufacture
per project, end-to-end
qualified samples with test data
every supplier certified or better
DoE VI, 62368-1, 60601
Switch-mode supplies we design
AC-DC switching supplies
External, enclosed and open-frame SMPS — single or multi-output, convection or fan-cooled.
On-board SMPS
Switch-mode converters designed onto your PCB, with the magnetics, layout and protections built in.
DC-DC converters
Isolated and non-isolated DC-DC modules to your rail, efficiency and footprint targets.
USB & USB-PD
USB-A and USB-C Power Delivery designs with the protocols and protections your device negotiation needs.
Looking for a finished enclosed unit or a drop-in brand alternative? See our custom power supplies and MeanWell-alternative supplies.
Engineering capability
- Topology selection — flyback, forward, LLC resonant, with PFC above ~75 W
- Magnetic design (transformer, choke) for efficiency, regulation and thermal performance
- Multi-output, adjustable, remote-sense and PMBus / digital-control designs
- Efficiency engineering to DoE Level VI / CoC Tier 2 and low standby power
- Safety & EMC — IEC/UL 62368-1, medical 60601, CE/UKCA, EMC class B
- Protections designed in — OVP, OCP, OTP, SCP, hold-up and inrush control
- Thermal, mechanical and ingress-protection (IP) design
- One dedicated engineer; qualified samples with full test data before volume
At a glance
| Types | External adapter / enclosed / open-frame / on-board SMPS / USB-PD |
| Input | Universal 90–264 VAC, 50/60 Hz, or DC input |
| Output | Single or multi-output; built to your V/A per rail |
| Efficiency | DoE Level VI / CoC Tier 2; low no-load power |
| Safety | IEC/UL 62368-1, 60601 (medical), CE/UKCA |
| 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, topology and magnetic design, efficiency and thermal optimisation, and protections engineered in. We design the switch-mode converter to your envelope and safety class, not just a catalogue match.
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 input range, outputs, efficiency and safety targets. One dedicated engineer reviews it and confirms the design 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
Industrial automation & instrumentation · medical & laboratory equipment · LED lighting · consumer electronics · networking & telecoms · IoT & embedded · e-mobility & charging.
Explore related services: custom power supplies, MeanWell-alternative supplies, electronics contract manufacturing and flexible PCB.
Choosing the right switch-mode supply
Getting the SMPS architecture right early saves costly re-spins and compliance delays. A few decisions shape every design:
| Form factor | External desktop/wall adapter for portable gear; enclosed for industrial; open-frame to embed; on-board SMPS where the converter lives on your PCB. |
| Topology | Flyback for low-to-mid power; forward / LLC resonant for higher power and efficiency; add PFC above ~75 W. |
| Efficiency | Specify DoE Level VI / CoC Tier 2 and no-load power for external units — it drives topology, magnetics and thermal design. |
| Safety class | IEC/UL 62368-1 for ITE/AV, 60601 for medical; creepage, clearance and isolation built to class. |
| Protections | Define OVP, OCP, OTP, SCP and hold-up time up front so they are designed in, not bolted on. |
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:
- Input voltage range and frequency (or DC input)
- Output voltage(s), current/wattage per rail, regulation and ripple targets
- Single or multi-output; adjustable, remote-sense or digital-control needs
- Efficiency target (DoE VI / CoC Tier 2) and standby-power limit
- Safety and EMC standards (62368-1, 60601, CE/UKCA, EMC class)
- Protections, hold-up time, inrush and isolation requirements
- Connectors, plug type, mechanical envelope, cooling and IP rating
- Any MeanWell or other reference part, target cost and annual volume
Working from a reference part or a sample is fine — our engineer will design a drop-in equivalent or an improved alternative to your specification.
Get a quote
Send your input range, outputs and safety targets and one dedicated engineer will reply — typically within 48 hours — with a proposed design and indicative pricing. No project too big or too small.
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