Planar components for SMPS

In the design of a low profile SMPS transformers or storage choke, we highly recommend the use of our ferrite planar cores. The use of this core shape allows you a high power and current density, combined with a substantially reduced overall height.

The improved surface to volume ratio provides outstanding electric performance. In addition, it increases uniformity of electrical parameters and as well the reliability and lifetime of the components.

These characteristics allow a very flexible and versatile use of the range of Kaschke Planar Cores when constructing high power inductive components. By choosing the low loss high frequency ferrite material you will achieve the optimal solution in the frequency range of 100-1000 kHz.

Advantages of the planar cores

  • Reduced height
  • High power density
  • Reduced power losses up to high operating frequencies
  • Outstanding thermal properties due to extended surfaces
  • Reduced leakage flux
  • High yield and stability of electrical parameters
  • High reliability 

Application note

Planar Core Series: The most favoured products are types PE/PI 18, 22, 32, 38, 43 and 64 available as E- or I-Core. Other types of the Planar Core Family, all standardized according to IEC 61860, are available on request. Air gap: On request, all PE-Cores can be supplied with an airgap.

Material Specificaton

Our range of Planar Cores were designed using the Kaschke low loss power ferrite materials K2008 and K 2001. The material K 2008 is suitable for a application frequency up to 500 kHz, while K2001 designed for the use up to 1 MHz.

Fig. 1 Shows the performance factor of both.

To calculate the Performance factor, firstly measure for each frequency the inducation B300, which is defined as the induction level core losses of 300mW/cm3. The performance factor is calculated by multiplying B300 with the frequency. The performance factor vs. frequency plot enables a comparison of power materials and the choice of the optimal frequency for your application.

Dimension[mm]PE / PI 18PE / PI 22PE / PI 32PE / PI 38PE / PI 43PE / PI 64
A17.65 - 18.3521.40 - 22.2031.10 - 32.4037.30 - 38.9042.90 - 44.10 64.0 ± 1.3 / 63.8 ± 1.3
B3.90 - 4.105.60 - 5.808.10 - 8.408.10 - 8.409.35 - 9.6510.2 ± 0.13
C9.80 - 10.2015.50 - 16.1024.85 -25.9524.85 - 25.9527.30 - 28.5050.8 ± 1 / 50.3 ± 1
D1.90 - 2.103.10 - 3.304.30 - 4.604.30 - 4.605.25 - 5.555.1 ± 0.13
E13.70 - 14.3016.40 - 7.2030.20 - 31.4030.20 - 31.4034.70 - 36.3053.8 ± 1.1
F3.90 - 4.104.90 - 5.107.40 - 7.807.40 - 7.807.90 - 8.3010.2 ± 0.2
G1.90 - 2.102.40 - 2.603.65 - 3.953.65 - 3.953.95 - 4.255.08 ± 0.13
Core parameterPEE18PEI18PEE22PEI22PEE32PEI32
Core facotrC1 =Σ l/A[mm-1]0.6180.5130.4140.3320.3180.136
Eff. path lengthIe [mm]24.320.332.526.141.469.6
Eff. cross sectionAe [mm2]39.339.578.378.9130511
Min. cross sectionAmin [mm2]38.938.977.977.9128511
Eff. magn. VolumeVe [mm3]95580225402050539035500
K 2008
AL-Value ± 25% [nH]3500380055006350715016950
losses PCORE [W]bei f=100kHz, B=200mT, T=100°C≤ 0.48≤ 0.40≤ 1.3≤ 1.0≤ 2.7≤ 17.8
losses PCORE [W]bei f=500kHz, B=50mT, T=100°C≤ 0.19≤ 0.16≤ 0.51≤ 0.41≤ 1.1
K 2001
AL-Value± 25% [nH]25002750385045505000
losses PCORE [W]bei f=500kHz, B=50mT, T=100°C≤ 0.14≤ 0.12≤ 0.38≤ 0.31≤ 0.81
losses PCORE [W]bei f=1MHz, B=25mT, T=100°C≤ 0.15≤ 0.13≤ 0.41≤ 0.33≤ 0.86
Core parameterPEE38PEI38PEE43PEI43PEE64PEI64
Core factorC1 =Σ l/A [mm-1]0.2700.2250.2670.2200.1560.136
Eff. path lengthIe [mm]52.443.661.150.479.769.6
Eff. cross sectionAe [mm2]194194229229511511
Min. cross sectionAmin [mm2]192192225225511511
Eff. magn. VolumeVe [mm3]10200844014000115004070035500
K 2008
AL-Value± 25% [nH]8450110008550103001610016950
losses PCORE [W]bei f=100kHz, B=200mT, T=100°C≤ 5.1≤ 4.2≤ 7.0≤ 5.8≤ 20.4≤ 17.8
losses PCORE [W]bei f=500kHz, B=50mT, T=100°C≤ 2.1≤ 1.7≤ 2.8≤ 2.3
K 2001
AL-Value± 25% [nH]5950705060007250
losses PCORE [W]bei f=500kHz, B=50mT, T=100°C≤ 1.5≤ 1.3≤ 2.1≤ 1.7
losses PCORE [W]bei f=1MHz, B=25mT, T=100°C≤ 1.6≤ 1.4≤ 2.3≤ 1.9

Material

Ordering Code
PE / PI 18PE / PI 22PE / PI 32PE / PI 38PE / PI 43PE / PI 64
K2008PE-Core382184 001028382226 001028382326 501028382388 001028382439 501028382641 001028
PI-Core382182 090028382222 590028382323 290028382383 890028382434 190028382645 190028
K2001PE-Core382184 001021382226 001021382326 501021382388 001021382439 501021382641 001021
PI-Core382182 090021382222 590021382323 290021382383 890021382434 190021382645 190021

 

 

 

Inductive components

We can highly recommend the design of inductive components based upon our planar core series. Typical components are storage chokes and transformers. Windings can be constructed by using multilayer PCBs, Disc-winding or preproduced stamped copper plates, or a mixture of both.

The range of planar cores we offer generate a lot options for the design of planar magnetics. Our transformers can also be designed to comply with EN 60950 safety standards.