47000 and 48000 Series PCB AC-DC Power Supplies
- Technology
- PCB AC-DC power supplies
- Partner
- Myrra
Myrra’s 47000 and 48000 Series AC-DC modules provide a convenient way to integrate a mains power supply directly onto a circuit board without a separate PSU. These compact flyback converters are fully encapsulated in a plastic case and deliver isolated DC outputs from a universal 85–265 Vac or 120–370 Vdc input. The 48000 Series focuses on ultra-compact 1 W to 3 W modules for low-power electronics, while the 47000 Series spans approximately 2.5 W to 60 W and includes dual-output variants. The range is suited to industrial controls, IoT devices, smart appliances, and embedded systems where space, safety, and efficiency matter. International safety approvals help simplify compliance for end equipment. High efficiency and very low no-load consumption support modern energy-saving requirements. Integrated protection features and internal EMC compliance reduce external design effort. The result is a practical PCB-mount AC-DC solution for compact, isolated, and globally compatible power conversion.
The Myrra 47000 and 48000 series AC-DC power supplies are compact encapsulated modules designed for direct PCB mounting in embedded mains-powered equipment.
With universal AC input, reinforced isolation, integrated protection functions, and low standby consumption, they help designers replace bulkier transformer or open-frame solutions with a simpler drop-in switched-mode power stage.
The 48000 Series is aimed at ultra-low-power applications from 1 W to 3 W, while the 47000 Series extends into higher-power designs up to 60 W and includes single-output as well as selected dual-output options.
Range features
A high level overview of what this range offers
- Fully encapsulated PCB module: Potted construction with flame-retardant enclosure supports safer direct board integration and reinforced insulation.
- Universal mains input: Accepts 85–265 Vac and 120–370 Vdc, enabling one design for global voltage ranges.
- Wide power coverage: Available from 1 W to 60 W to support low-power sensors through to larger control electronics.
- Single and dual output options: Standard output voltages from 3.3 V to 24 V, with selected 47000 Series dual-output variants.
- High efficiency and low standby draw: Typically around 70–80% efficiency with very low no-load consumption for energy-sensitive designs.
- Integrated protection functions: Includes overload, short-circuit, and over-temperature protection with auto-recovery behavior.
- Built-in EMC performance: Designed to meet Class B emission requirements without mandatory external EMI filtering.
- Compact standard footprints: Smaller models can fit common PCB transformer replacement footprints for easier upgrades.
- Certified safety isolation: Reinforced isolation with international safety approvals helps accelerate end-product compliance.
What’s in this range?
All the variants in the range and a comparison of what they offer
Specification | 47000 Series | 48000 Series |
Power range | 2.5 W to 60 W | 1 W to 3 W |
Output configuration | Single-output and dual-output models available | Single-output models only |
Standard output voltages | 3.3 V to 24 V, including selected dual-output options | 3.3 V to 24 V single outputs |
Input voltage | 85–265 Vac, 47–440 Hz, or 120–370 Vdc | 85–265 Vac, 47–440 Hz, or 120–370 Vdc |
Isolation and safety | Reinforced isolation, 3000 Vac test, IEC 60950-1 / 60335 / 61558 certified | Reinforced isolation, 3000 Vac test, IEC 60950-1 / 60335 certified |
Efficiency | ~75–80% at full load, model dependent | ~70–78% at full load, model dependent |
No-load input draw | Typically below 0.1 W for green models | Typically below 0.1 W |
Operating temperature | -25 °C to +70 °C ambient, some models up to +80 °C with derating | -25 °C to +70 °C ambient |
Form factor | Compact encapsulated module, size varies by power level | Ultra-compact encapsulated module, e.g. about 25 × 16 × 16 mm for 3 W |
Protection features | Overload with auto-recovery, short-circuit, over-temperature | Overload with auto-recovery, short-circuit, over-temperature |
FAQs
for 47000 and 48000 Series PCB AC-DC Power Supplies
The 48000 Series focuses on Myrra’s smallest AC-DC modules from 1 W to 3 W for very low-power, space-constrained designs. The 47000 Series covers a broader range from about 2.5 W up to 60 W and includes both single-output and selected dual-output models. Both series share universal input capability and reinforced isolation, but the 47000 family offers higher power and more output configuration flexibility.
They are designed as ready-to-use PCB power supplies with internal EMI filtering and internal output capacitors. In many applications, only an input slow-blow fuse is needed for safety, and a MOV or surge suppressor may be added where surge protection is required. Under normal operation, no mandatory extra output capacitors or external EMI chokes are typically needed.
In this context, unregulated versions use primary-side regulation only, so output voltage can vary more with load and input conditions. Regulated versions use secondary-side feedback, typically with an optocoupler, to hold the output voltage more accurately. Regulated models are the better choice where tighter voltage tolerance is important.
Some dual-output versions provide isolated outputs that can be used independently or arranged as a symmetrical supply such as +V/-V. Other versions use a common-ground dual-output arrangement. The exact configuration depends on the specific module, so the datasheet should be checked to confirm whether the outputs are isolated or share a common return.
Both series are designed with reinforced isolation between the mains input and low-voltage output. The typical isolation test voltage is 3000 Vac, supporting use in industrial, commercial, and household equipment that requires mains isolation. Proper PCB spacing and the recommended input protection should still be followed during integration.
Typical efficiency is around 70–80% at full load, depending on the model and output voltage. Heat generation is modest for this class of encapsulated flyback converter and is dissipated through the module body under natural convection. In most applications, no separate heatsink is required as long as the module is operated within its power and ambient temperature limits.
These modules are designed for very low no-load consumption, generally below 0.1 W for the lower-power models. Regulated versions typically do not require a strict minimum load and can operate with light or zero load. This makes them suitable for standby-heavy products and low-energy embedded systems.
Paralleling outputs is generally not recommended because small output voltage differences can cause uneven current sharing. Series connection can be possible if the outputs are isolated and the total voltage remains within safety and application limits. Any such configuration should be verified against the datasheet guidance for the exact module.
The standard ambient operating range is typically -25 °C to +70 °C. Some 47000 Series models may support operation up to +80 °C with output derating. For hotter enclosed environments, selecting extra power headroom and checking the derating curve is recommended.
These series are intended for industrial, commercial, and household applications rather than patient-connected medical equipment. They are certified to industrial and consumer safety standards, not the medical standard IEC 60601-1. If a medical design requires dedicated medical isolation or leakage-current compliance, a medical-rated power solution should be used instead.
