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PDF ECO6907 Data sheet ( Hoja de datos )
| Número de pieza | ECO6907 | |
| Descripción | Design of HF Wideband Power Transformers | |
| Fabricantes | Philips | |
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Hay una vista previa y un enlace de descarga de ECO6907 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
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APPLICATION NOTE
Design of HF wideband power
transformers
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1 page  
Philips Semiconductors
Design of HF wideband power
transformers
Application Note
ECO6907
handboo1k,0f1u2ll pagewidth
µrRp
L
(sec−1)
1011
1010
1
MGL235
1Z2
4C4
4C6
4B1
4A4
3H1
10
102
f (MHz)
103
Fig.1 Curves of µrRp/L plotted against frequency for our various ferrites. The curves have been plotted for small
signal conditions (Bmax → 0).
In Figs 2 to 7 the quantity µrRp/L is given for different ferrite materials as a function of the product Bmax × ƒ with the
frequency as a parameter. The product Bmax × ƒ has been chosen because, for most transformers, its value remains
constant for changing frequency. From Figs 2 to 7 it can be seen that Rp decreases as Bmax increases, especially at
lower frequencies. This forms the primary limit on the power handling capability of these transformers. If 4C4 material
(Fig.5) is used in the h.f. region, the Bmax × ƒ product must not be higher than approx. 2 × 104 T.Hz. Combining this with
the choice of L according to the second equation in Section 3.1, we find that the power loss caused by the core material
will be no more than 1%. At frequencies of 30 MHz and higher it seems that higher Bmax × ƒ products, perhaps up to
105 T.Hz, can be used. For IZ2 ferroxplana this has already been confirmed by measurements at 165 MHz.
A very conservative choice of the Bmax value must also be avoided because this leads to a greater length of the
transmission line and consequently more loss at the high end of the band.
4 INFLUENCE OF THE TRANSMISSION LINE ON PERFORMANCE
4.1 Resistive Loss and Power Handling
The power loss in the transmission line depends on:
• The type of line
• The frequency
• The length.
Data on power loss in some 50 Ω coaxial cables is given in Fig.8. This power loss and the allowable maximum cable
temperature restrict the power handling of the cable. The maximum power which can be transmitted depends on the type
of cable and the frequency; data is given in Fig.9.
1998 Mar 23
5
5 Page 
Philips Semiconductors
Design of HF wideband power
transformers
5 COMPENSATION TECHNIQUES
5.1 Compensation at Low Frequencies
Application Note
ECO6907
handbook, halfpage
R
E
R
MGL218
handbook, halfpage
R
E
LR
MGL219
Fig.10 Schematic diagram.
Fig.11 Low frequency equivalent diagram.
handbook, halfpage
CL CL
R
LR
E
MGL220
handbook, halfpage
CL
R
E
R
CL MGL221
Fig.12 Equivalent diagram with compensation.
Fig.13 Schematic diagram with compensation.
1998 Mar 23
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ECO6907.PDF ] | |
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