Developers of state-of-the-art switched mode power supplies (SMPS) face a variety of challenges: increasing performance requirements, high efficiency, compact designs, and robust designs. For single- to three-phase SMPS with 230 VAC input and output voltages of, for example, 5 V, 12 V, 24 V, and up to 48 VDC, selecting the right electronic components is crucial for performance, reliability, and time-to-market.
At alfatec, we support you in mastering these challenges. Instead of classic distribution, we offer you application-specific solutions – individually tailored to your requirements.
Functional blocks of a state-of-the-art SMPS
Below we show a simplified block diagram of a typical SMPS:
Read our article in this section or click here to view the circuit diagram, including product recommendations:
Each of these functional blocks focuses on specific electronic components from our suppliers, which we present as examples in the main section of this newsletter. These include components for mains input and EMC protection, high-performance semiconductors for power conversion, passive components for energy storage, and solutions for control, monitoring, and galvanic isolation.
Components for blocks Block Circuit Protection
Our supplier for fuses: Conquer
The CQ12LV product series of fast-acting SMD fuses from the supplier Conquer.
- 1-20 A
- 24V/63VDC
- fast‑acting
- 1206 package
Components for block mains filters
The supplier Faratronic offers film capacitors such as X2 from the C42 product series, C4V (125°C) and Y2 from the C43 product series, as well as film capacitors from the C6A series for mains filters. For outdoor applications, there are corresponding THB variants with increased robustness for the mentioned X and Y film capacitors.
- Rated voltage up to 480Vac
- Capacitance up to 27.0µF
As our manufacturer for wound products, Sunlord offers common mode chokes, PFC coils, storage inductors, SMD ferrites, and transformers.
Features of common mode chokes with toroidal core from the ARCDC product series:
- Variants: 2-, 3-, and 4-phase
- Rated currents: 0.5A to 50A
- Impedances: 1 kOhm to 4 kOhm
- Inductance: 1 mH – 20 mH
- Core materials: nanocrystalline, amorphous
Block PFC
Electrical characteristics of SMD PFC inductors in the AMWPQ series:
- Inductors 1.5 µH – 33 µH
- Nominal current: < 60A
Electrical characteristics of THT PFC inductors with toroidal cores (high power) in the ARLDC series:
- Inductors, for example, 150µH at 32A
- For power ratings up to 7kW
Block PWM Control
Our supplier for Snubber capacitors: Samwha
The supplier Samwha offers film capacitors from the CS and CQ product series, which we recommend for snubbers.
- e.g.: Housing 5750, dielectric X7R, capacity 10uF, rated voltage 100V
- e.g.: Housing 3225, dielectric X7R, capacity 4.7uF, rated voltage 50V
- e.g.: Housing 3225, dielectric X7R, capacity 10uF, rated voltage 50V
Our suppier S4sensors of the SPARC Group offers hall current sensors like the current sensor „S4-CSA02“:
Components for block galvanic Isolation
Our supplier Sunlord offers a wide range of transformers for various applications, such as SMPS, gate driver, and current sense circuits, with multiple core sizes and different rated powers according to your specifications.
Features of transformers in the ATWPEF product series:
- Temperature range: -40°C to +150°C
- Core sizes: EF-09/12/13/15/35
- Operating voltage: ≤400V to 1200V
- Output power: Po ≤3W to ≤100W
- Switching frequencies: ≤100kHz to ≤500kHz
Components for block DC/DC LDO
Electrical characteristics of shielded power inductors in the SWPA product series:
- Inductance 0.22~680 µH
- Nominal current up to 7.5 A
- Designs 2.5 x 2.0 mm – 8 x 8 mm in many height versions
- Compatible with industry standards and offering excellent value for money
- Magnetic powder material resin
Electrical characteristics of molded inductors in the MWSA/ MWLA / MWFC product series:
- Inductance 0.1 ~ 100 µH
- Rated current up to 45 A
- Design: 4.2 x 4.4 mm – 22 x 23.5 mm
- Suitable for high switching frequencies, MWFC version with flat wire and T-core for maximum efficiency
The CS and CQ product series from our supplier Samwha offer MLCC ceramic capacitors for DC/DC and isolated AC/DC switching regulators, for example, which we recommend as follows:
- Voltage: 6.3 to 3000V
- Capacitance: 0.5pF to 100µF
- Size: 0201 to 2220 inch (0603 to 5750mm)
Components for block rectifiers & filters
Electrical characteristics of SMD chip ferrite:
The APZ, AUPZ, and AEPZ series include ferrites for filtering DC current and signal lines with high insertion loss over a wide frequency range:
- Nominal current: up to 10A
- Size: EIA0201-EIA1806
- Impedances: 5 ohms to 1000 ohms @ 100 MHz
Components for PFC, rectifier & filter, and DC/DC LDO blocks
Our partner Chemi‑Con offers MLCC, polymer, and electrolytic capacitors with low ESR, small form factors, and good temperature stability—recommended for SMPS:
Electrical characteristics of SMD polymer hybrid capacitors in the HFX series:
- Endurance with ripple current: 4,000 hours at 135℃
- Rated voltage range: 25 to 63Vdc, Capacitance range: 33 to 560μF
- For high temperature and high reliability applications
Features of THT electrolytic capacitors in the KXN series
- Rated voltage from 6.3 to 450Vdc
- Capacitance up to 22000μF
- Long life 10,000 to 12,000 hours at 105℃
- Alternative product series with the same parameters as the KZN series.
Features of SMD polymer capacitors in the PXF series:
- Super low ESR, impedance, and high heat resistance
- Rated voltage range: 2 to 10 Vdc
- Capacitance range: 120 to 680 μF
Features of SMD low ESR polymer capacitors in the PXD series:
- Category temp range: -55～+125℃
- Rated voltage： 2.5～10V
- 120Hz Very low ESR, long life
Features of snap-in aluminum electrolytic capacitors:
The latest developments, such as the KHU and LHU series, are suitable for EV applications thanks to their low ESR and high heat dissipation.
- Rated voltages: up to 500V
- Rated capacity: up to 1420μF
- Service life: 3000h or 5000h
- Ripple currents: from 3610mArms to 4420mArms
The KHX and LHX series offer:
- Nominal voltages: up to 400V
- Nominal capacity: up to 1380μF
- Case size: 23x60mm
- Ripple currents: 1540mArms to 4320mArms.
Immerse yourself in the world of Chemi-Con and experience the future of electrolytic capacitors. Trust in over 90 years of experience and progress!
Components for primary switch and DC/DC LDO blocks
Our supplier Junshine for MOSFETs:
Junshine's low voltage SGT MOSFETs offer market-leading performance and vertical integration with in-house MOSFET chip production in Europe. Available discrete components offer low RDSon:
Discrete component features:
- RDSon: from ≥0.5mOhm
- Drain-source voltage: 40V to 150V
- Package: DFN3x3, DFN5x6, TOLL, TOLT, TO220, TO263, TO247
Our supplier SilverMicro for IGBTs:
SilverMicro IGBTs are produced in-house using vertically integrated chip production in Europe.
Discrete IGBT Electrical characteristics:
- ≤120A at 650V
- ≤75A at 1200V
IGBT module Electrical characteristics:
- ≤600A at 650V
- ≤900A at 1200V
- ≤600A at 1700V
Our suppliers PNJ and SemiQ for SiC MOSFETs:
Our suppliers PNJ and SemiQ offer discrete MOSFETs in various package types such as THT, SMD, and with insulated topside cooling technology.
A comparison of the package types of components from our competitors and our suppliers shows that the SiC MOSFETs from SemiQ and PNJ in the same package enable the lowest RDS(on) on the market at a gate-source voltage of 750 V, for example.
Electrical characteristics of discrete components:
- RDSon: from ≥6.8 mOhm
- Drain-source voltage: 750 V to 3300V
- Package: TO247, TO263, TOLL, TOLT, QDPAK, TO247, TSPAK
Module features:
- RDSon: from ≥1.0 mOhm
- Drain-source voltage: 750V to 2000V
- Package: HPD, TPAK, MSOP9, ED3, Easy1B, Easy2B/3B, 62mm, SOT227, DCM, mini HPD, MSOP9
Visit our applications section on the website:
Take a look at our block diagrams for SMPS and discover suitable solutions for your application.
Your added value with alfatec:
Our sales department offers you electronic components for SMPS of all power classes, tailor-made for your applications – from the concept phase to series production. In addition, our sales and product and application management contacts, together with field application engineers, actively support you in component selection and the design-in process.
Working closely with our suppliers, we help you to implement technically and economically optimal solutions for your project. Thanks to our own warehouse in Germany, many components are also available at short notice.
Get in touch with us now!
If you are interested in datasheets or have any questions, we are happy to help. Feel free to contact us if you need technical support – we are here for you.
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