Трансформатор LUNDAHL LL6404. Инструкция на английском языке

Tibeliusgatan 7                        International    Domestic
LUNDAHL                        S-761 50 NORRTALJE          Phone    +46 - 176 13930   0176-13930
TRANSFORMERS                SWEDEN                      Fax      +46 - 176 13935   0176-13935
Very Small Size Zero Field Input Transformer
LL6404
In a Zero Field (ZF) transformer, the magnetic field caused by the input signal should be balanced by a
feedback loop which includes the transformer's secondary winding (see schematic below). The feedback
arrangement extends the low frequency range (to almost DC!) while maintaining the small size of the
transformer. The very small size of the LL6404 requires that the feedback resistor value be very close to the
secondary winding resistance.
Turns ratio:                                             1 : 1
Dims (Length x Width x Height above PCB (mm)):           15.5 x 11 x 10
Pin layout (component side view) and winding schematics:
4           1             4                   1
2
6           3             6                   3
Can and core  2
Housing:                                                 Mu-metal
Core:                                                    Amorphous strip core
Impregnation:                                            Solvent less epoxy resin
Spacing between pins:                                    2.54 mm  (0.1")
Spacing between rows of pins:                            10.16 mm  (0.4")
Weight:                                                  4 g
Rec. PCB hole diameter:                                  1.5 mm
Static resistance of primary (pins 4 - 6):               210W
Static resistance of secondary (pins 1 - 3):             160W
Isolation between windings/ between windings and core:   3kV / 1.5 kV
Principle design of Zero Field input circuitry:
R1                                 10K
4    1
LL6404  2
6    3
R2
10K
Select R1, R2 for best CMR                             Select R3 for best THD at low
and for desired input impedance.                       freq. R3 ~ 160 ohms
R1 and R2 typically close to 5 k   C              R3
for a 10 k input.
Select C such that C*R 3 gives
sufficient LF response.
R021105