MH&W: CSC Powder Cores

By: Mh&w International  09-12-2011
Keywords: Flux, Core Losses, Powder Cores,

Powder cores are distributed air gap cores made from ferrous alloy powders for low losses at high frequencies. Small air gaps distributed evenly throughout the cores increase the amount of DC that can be passed though the winding before core saturation occurs. Molybdenum permalloy powder (MPP) cores are excellent as low loss inductors for switch-mode power supplies, switching regulators and noise filters. High Flux and Sendust powder cores are better choice for the power factor correction (PFC), switching regulator inductors, in-line noise filters, pulse and flyback transformers, and many other application required for low losses at high frequencies.

MH&W International offers many types of soft magnetic powder cores of the Molybdenum Permalloy(MPP), High Flux, Sendust and the new Mega Flux core materials, which are mainly used for inductors and transformers requiring the low losses and inductance stability under high DC bias conditions. The fully standardized production under strict quality control from raw materials (nickel, iron, molybdenum, aluminum and silicon) to finished products enables MH&W to reduce the variations in product quality making it possible to maintain a guaranteed level of quality.

  MPP High Flux Sendust Mega Flux
Materials Ni-Fe-Mo alloy Ni-Fe alloy Fe-Si-Al alloy Fe-Si alloy
Color Yellow Green Blue Dark Brown
Finish Epoxy, Parylene-C, Plastic Case
Sizes From 3.5mm OD to 77.8mm OD
Permeabilities (µ) 26, 60, 125, 147,
160, 173, 200
26, 60, 125, 147,160 26, 60, 75, 90, 125 -
Break-Down Voltage 500V min. 500V min. 500V min. -
Magnetic Characteristics

Relatively high saturation flux density

Low residual flux density

Excellent temperature stability

Low core losses

Excellent inductance stability under high DC bias conditions

Highest biasing capability

High saturation flux density of 15,000G compared to 7,000G for MPP and 10,000G for Sendust

Relatively low core losses

Core losses significantly lower than powdered iron

Good DC bias characteristics

Cost between powdered iron and MPP

Bsat : 1.6 Tesla

High energy storage capacity

Low core losses compared to Fe-Si Laminations

Low relative cost

Block assembly available

Good candidate for high-end applications

Major Applications

Direct current output inductors for SMPS

High Q filters

Loading coils

EMI/RFI filters

Many other precision applications

Power factor correction(PFC) circuits

Switching regulator inductors

In-line noise filters

Pulse and flyback transformers

Power factor correction(PFC) circuits

Switching regulator inductors

In-line noise filiters

Pulse and flyback transformers

Output Chokes

Line filters

PFC reactors

Flyback transformers


VRM cores for PC

DC-AC reactor for renewable & alternative energy

DC-AC reactor for industrial & military demands

Boosting coil for (Hybrid) electric vehicles

Material Characteristic Comparisons
DC Bias
MPP Lowest Better High 1MHz 7,000G Best
High Flux Low Best Medium 1MHz 15,000G Better
Sendust Medium Good Low 2MHz 10,000G Good
Mega Flux Medium Best Low 1MHz 10,000G Best
Iron Highest Poor Lowest 100KHz 10,000G poor
Amporphous (gapped) Medium Better Highest 300KHz 6,500G poor
Ferrite (gapped) Lowest Poor Low 1MHZ 4,500G poor
Computer Desk top PC DC Reactor, Choke Coil for SMPS
Lap Top PC DC Reactor, Choke Coil for SMPS
Server PC DC Reactor, Buck Inductor for SMPS Buck Inductor for VRM
Display PDP DC Reactor, Buck Inductor for Pre-regulator
LCD TV Choke Coil for Adapter
Lap Top PC LCD Choke Coil for LCD Back Light Inverter
PDA Choke Coil for LCD Back Light Inverter
Mobile Phone Choke Coil for LCD Back Light Inverter
Home Appliances Digital Amp(for Home Theater) Low Pass Filter for Digital Amp
Digital Camera/Camcoder Choke Coil for LCD Back Light Inverter
Inverter Airconditioner DC Reactor for PFC
Induction Heating AC Reactor for PFC
Industrial Uses Elevator AC Reactor for PFC
CNC AC Reactor for PFC
UPS DC Reactor for SMPS
Automobile 42V Power Module Back-Boost Inverter for DC DC Converter
EV, HEA Back-Boost Inverter for DC DC Converter
Substitutional Energy Solar Cell Generating System DC Reactor, AC Reactor for Inverter
Fuel Cell Generating System DC Reactor, AC Reactor for Inverter
Telecommunications Relay Center of Mobile Devices DC Reactor for SMPS
Mobile Phone Choke Coil for DC DC Converter
Common Uses Differential Mode Noise Filter

Keywords: Core Losses, Flux, Powder Cores,

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