AN2690

Transformer specification

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Figure 28.

Transformer winding diagram

Note:

Primaries A and B are in parallel

Mechanical aspect and pin numbering

●

Maximum height from PCB: 30 mm

●

Coil former type: horizontal, 9+9 pins (pins 2 removed)

●

Pin distance: 4 mm

●

Row distance: 35 mm

●

External copper shield: not insulated, wound around the ferrite core and including the

coil former. Height is 12 mm.

Table 7.

Transformer winding characterisctics

Pins

Winding

O/P RMS

current

Number of

turns

Number of

layers

Wire type

5-6

AUX

7 spaced

1

G2 –

φ 0.23 mm

3-1

Primary - A

60

2

G2 – 2 x

φ 0.23 mm

8-10

19 V

8

1

Multistrand G2 – 4 x

φ 0.64 mm

4-2

Primary - B

60

2

G2– 2 x

φ 0.23 mm

COIL FORMER

POLYESTER TAPE – 1 LAYER

6.2

6.2

PRIMARY - B

19V

PRIMARY - A

AUX

POLYESTER TAPE – 2 LAYERS

POLYESTER TAPE – 2 LAYERS

POLYESTER TAPE – 2 LAYERS

BARRIER TAPE