Трансформатор LUNDAHL LL1545A. 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
Audio Transformer
LL1545A
LL1545A is a general-purpose audio transformer with a variety of connection alternatives. The transformer is
built up from two coils, each with a secondary winding surrounded by shields and two primary windings. This
structure results in an excellent frequency response. The transformer can be used in many different applications
such as a high impedance line input transformer (accepting signal levels of  22 dBU @ 40 Hz with primaries in
series),  for splitting or as a microphone input transformer.
The LL1545A is made with a mu-metal core and is housed in a mu-metal can.
Refer to page 2 of this sheet for termination alternatives.
Turns ratio:                                             1 + 1 + 1 + 1 : 2 + 2
Dims: (Length x Width x Height above PCB (mm))           37 x 22.5 x 14.5
Pin Layout (viewed from component side) and windings schematics:
1
8               16                       2                   9
7               15                       3
6   LL1545A     14                       4                 10
5
13
11
4    (top view)                          8                 14
3               11                       7                 16
2
10
1                9
6                 15
5       Can + Core 13
Spacing between pins:                                  2.54 mm  (0.1")
Spacing between rows of pins:                          22.86 mm  (0.9")
Weight:                                                46 g
Rec. PCB hole diameter                                 1.5 mm
Static resistance of  windings:   2-3 or 6-7           122 W
1-4 or 5-8                182 W
9-10 or 15-16             305 W
Self resonance point:                                  > 220 kHz
Recommended load for best square-wave response
(Termination alternative R4B:L4B over):            6.7 kW + 470 pF
Frequency response  (source 600W ,                     10 Hz - 70 kHz +/- 0.5 dB @ 0 dBU
load  (6.7 kW + 470 pF) in parallel with 56 kW ):
Loss across transformer (at 1 kHz with termination as above):    0.3 dB
Core:                                                  Mu-metal
Isolation between windings / between windings and shields:   3 kV / 1.5 kV
Data at different termination alternatives, showed on page 2 of this data sheet.
Termination Alternatives  Turns  Copper Resistance  Idle impedance   Suggested Use  THD < 0.2%@40 Hz
ratio    Prim/sec      @40 Hz, 0dBU                primary level /
real source impedance
R4B / R4U : L4B / L4U   1:1  610 W / 610 W   80 kW / 80 kW   10 kW / 10 kW  22 dBU  / 600 W
R2B / R2U : L2B / L2U   1:1  150 W / 150 W   20 kW / 20 kW   600 W / 600 W  16 dBU / 150 W
R2B / R2U : L4B / L4U   1:2  150 W / 610 W   20 kW / 80 kW   600 W / 2.5 kW  16 dbU / 150 W
R4B / R4U : L2B / L2U   2:1  610 W / 150 W    80 kW / 20 kW  10 kW / 2.5 kW  22 dBU / 37.5 W
R4B / R4U : L1         4:1  610 W / 75 W      80 kW / 5 kW   10 kW / 600 W  22 dBU / 37.5 W
R030220
LL1545A , page 1

9        1
10       2
11        3
4
Connection alternatives for LL1545A                              13       5
14
6
Component side view                                              15       7
16
8
Component side view
Connection: R4B             Connection: R4U              Connection: R2B
Balanced source             Unbalanced source             Balanced source
9                               9                            9
10                              10                           10
11                              11                           11
13                              13                           13
14                              14                           14
15                              15                           15
16                              16                           16
Grounded at
source
Connection R2U               Connection L4B               Connection L4U
Unbalanced source              Balanced load               Unbalanced load
9                1                         1
10                2                         2
11                3                         3
4                         4
13                5                         5
14                6                         6
15                7                         7
16                8                         8
Grounded at                          Centertap
source
Connection L2U               Connection L2B               Connection L1
Unbalanced load               Balanced load
1                            1                          1
2                            2                          2
3                            3                          3
4                            4                          4
5                            5                          5
6                            6                          6
7                            7                          7
8                            8                          8
Centertap
Turns   Application                                     Transformer      Transformer
ratio                                                 Input (primary)      Output
(secondary)
1:1     Line input to unbalanced circuits               R4B / R4U           L4U
1:2     Line input to unbalanced circuits               R2B / R2U           L4U
2:1     Line input to unbalanced circuits               R4B / R4U           L2U
1:1     Low impedance line input to unbalanced circuits   R2B / R2U         L2U
1:1     Line input to balanced circuits                 R4B / R4U           L4B
1:2     Line input to balanced circuits                 R2B / R2U           L4B
2:1     Line input to balanced circuits                 R4B / R4U           L2B
1:1     Low impedance line input to balanced circuits   R2B / R2U           L2B
R030206
LL1545A , page 2