Board details

UM0920

8/14

Doc ID 17220 Rev 2

3.3

Transformer

The transformer was developed in cooperation with EPCOS and is available through order

number T5684-51-01. The transformer specification is as follows:

–

E16/8/5 - 60 kHz, voltage range 85 VAC - 264 VAC

–

Core shape E16/8/5

–

Core material N87

–

Core Al 100 nH (0.29 mm gap)

–

Bobbin 8-pin - B66308 - B663080A1108T001

3.4

PCB details and layout

The layout of PCB is based on a one-sided FR4, with a 35 µm thickness. The total size of

the PCB is 41 x 58 mm, and the PCB space occupied by electronic circuitry is 33 x 45 mm.

The layout of the PCB is provided in Figure 4.

Table 1.

Transformer windings

Layer

Start pin

Stop pin

Number

of turns

Wire

number

Wire

diameter

Wire

material

Inductance

Position

1

1

2

157

1

0.2

Cu2l

2450 µH

Primary

2

8

4

16

1

0.3

Cu2

26 µH

Out +7 V

3

4

7

13

1

0.3

Cu2

17 µH

Out –5 V