Switching Converter, SMPS Transformers

Part Number	Description / PDF	Quantity
750314624 Würth Elektronik Midcom	XFRMR ISOL BUCK DC/DC CONV TH	69
750311624 Würth Elektronik Midcom	TRANS FLYBACK LT3748 LT3575 9UH	0
749119250 Würth Elektronik Midcom	WE-POE POWER OVER ETHERNET TRANS	0
750813021 Würth Elektronik Midcom	OFFLINE XFRM WE-UNIT TI LM3445	0
750811614 Würth Elektronik Midcom	THT OFFLINE TRANSFORMER WE-UNIT	0
750310020 Würth Elektronik Midcom	POWER OVER ETHERNET TRANSFORMER	0
750314460 Würth Elektronik Midcom	TRANSFORMER FLYBACK WE-FB SMD	0
7508110410 Würth Elektronik Midcom	OFFLINE TRANSFORMER WE-UNIT	0
750315856 Würth Elektronik Midcom	ISOLATED BUCK TRANSFORMER	0
750311303 Würth Elektronik Midcom	TRANS FLYBACK LT3575 50UH SMD	0
750311269 Würth Elektronik Midcom	TRANSFORMER FLYBACK NCL30001	0
750813530 Würth Elektronik Midcom	TRANS 3000V SMD	0
750311268 Würth Elektronik Midcom	FLYBACK XFRM WE-FB BROADCOM	0
750311525 Würth Elektronik Midcom	TRANS FLYBACK SSL2101 700UH	0
749196108 Würth Elektronik Midcom	WE-FLEX FLEXIBLE TRANSFORMER FOR	450
760390014 Würth Elektronik Midcom	TRANSFORMER 475UH SMD	12947
750316018 Würth Elektronik Midcom	PUSH-PULL TRANSFORMER TOR5.8/3.1	930
749119433 Würth Elektronik Midcom	TRANS FLYBACK POE+ 42UH SMD	10
750313972 Würth Elektronik Midcom	TRANS FLYBACK LT8301	0
749196527 Würth Elektronik Midcom	WE-FLEX FLEXIBLE TRANSFORMER FOR	0

Switching Converter, SMPS Transformers

1. Overview

Switching Mode Power Supply (SMPS) Transformers are critical components in power electronics systems, enabling efficient voltage conversion through high-frequency switching techniques. Unlike traditional linear transformers, SMPS transformers operate at frequencies typically above 20 kHz, allowing reduced size, weight, and improved energy efficiency. These components are essential for modern power management solutions in electronics, renewable energy systems, and industrial automation.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Discontinuous Mode (DCM) Flyback	Galvanic isolation, single-switch control	AC-DC adapters, battery chargers
Continuous Mode (CCM) Flyback	Higher power density, lower ripple current	LED drivers, industrial power supplies
Forward Converter	Efficient for medium power levels, requires reset circuit	Server power supplies, telecom equipment
Push-Pull	Balanced magnetic utilization, high efficiency	High-end audio amplifiers, welding machines
Half-Bridge/Full-Bridge	High power capability, symmetrical switching	Electric vehicle charging, solar inverters

3. Structure and Components

Typical SMPS transformer construction includes:

Core materials: Ferrite (Mn-Zn or Ni-Zn), Powdered Iron, Amorphous alloys
Winding configuration: Primary/secondary windings with optimized turn ratios
Insulation system: Bobbins, tape insulation, and potting compounds
Termination: Tin-plated copper leads or surface-mount pads
Shielding: Electrostatic shields for EMI reduction

4. Key Technical Specifications

Parameter	Importance
Input Voltage Range	Determines compatibility with power sources
Output Power Rating	Defines maximum energy transfer capability
Switching Frequency	Impacts size, efficiency, and EMI performance
Turns Ratio Accuracy	Affects voltage regulation precision
Isolation Voltage	Ensures safety and dielectric strength
Efficiency (Typical >90%)	Reduces thermal management requirements
Operating Temperature	Determines reliability in harsh environments

5. Application Fields

Major application sectors include:

Consumer Electronics: Mobile device chargers, laptop adapters
Industrial: Motor drives, PLC power supplies, test equipment
Telecommunications: Base station power systems, optical network equipment
Renewable Energy: Solar inverters, energy storage systems
Automotive: On-board chargers (OBC), DC-DC converters
Medical: Isolated power supplies for diagnostic equipment

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TDK-Lambda	PWM Switching Transformer	High-density design, 150kHz operating frequency
Coilcraft	XEL60xx Series	Ultra-low profile, 25A saturation current
Pulse Electronics	PA5477NL	Integrated EMI filtering, automotive qualified
Bel/Signal Transformer	125-2011-F	Medical-grade isolation, 4kV withstand
Delta Electronics	TMA-101-01	High-efficiency (94%), 1kW power rating

7. Selection Guidelines

Key considerations for optimal selection:

Power requirements (continuous vs peak load)
Switching frequency compatibility with controller ICs
Thermal management capabilities
Creepage/clearance distances for safety certification
Cost-performance trade-offs
Package dimensions and mounting requirements
Compliance with standards (UL, IEC, AEC-Q)

8. Industry Trends

Current development directions include:

Miniaturization through higher operating frequencies (>1MHz)
Integration with wide-bandgap semiconductors (GaN/SiC)
Advanced nanocrystalline core materials
AEC-Q qualified components for automotive electrification
Smart transformers with embedded sensing
RoHS-compliant, halogen-free construction

Market forecasts indicate 8.2% CAGR through 2028, driven by 5G infrastructure and renewable energy adoption.