Трансформатор LUNDAHL LL7101. Инструкция на английском языке

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Zero Field Input Transformer
LL7101
In a Zero Field (ZF) transformer application, the magnetic field caused by the input signal is balanced by a
feedback loop which includes the transformer’s secondary winding. (See application example below). The
feedback arrangement extends the low frequency range to almost DC in spite of the small size of the transformer.
Turns ratio:                                      1 + 1 : 1.38
Dims: (Length x Width x Height above PCB (mm))    28 x 18 x 11
Pin Layout (component side view) and winding schematics
1
4        8
3                                                     8
LL7101                           2
2 (Top view)  6
4
1        5                                            6
3                   5
can + core   5
Housing:                                          Mu-metal
Core:                                             Mu-metal
Impregnation:                                     Solventless epoxi resin
Spacing between pins:                             3.81 mm  (0.15")
Spacing between rows of pins:                     20.32 mm  (0.8")
Rec. PCB hole diameter:                    1.5 mm
Weight:                                           16 g
Static resistance of  each primary:               138 W
Static resistance of  secondary:                  28 W
Isolation between windings:                       2 kV
Recommended primary resistance:                   10 kW --
20 kW
Principle design of Zero Field input circuitry:
6 K
C
R1
4        8
3
LL7101
2        6
R2          1        5                            6 K
Select R3 for best THD at low
Select R1, R2 for best CMR                               freq. R3 ~ 28 ohms
and for desired input impedance.                     R3
R1 and R2 typically close to 5 k
Select C such that C*R sek  gives
for a 10 k input.
sufficient LF response.
R980626