Transformer specifications

AN3407

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Doc ID 018857 Rev 1

9

Transformer specifications

Figure 30.

Transformer: LP2920H - horizontal type for LLC transformer

Note:

Class B insulation system: SBI4.2

with standing voltage: 3.0 kV/1 sec/AC/5 mA, primary to secondary, 2.5 kV/1 sec/AC/3 mA,

primary to core, 1.0 kV/1 sec/AC/3 mA, secondary to core

Table 6.

Transformer specifications

Core spec-LP2920

Ae

Le

79.6 mm

Wiring spec. for resonant transformer

No.

Start

Finish

Wire

Winding

Turns

Inductance

DCR (m

Ω)

L1

1

3

0.1

Φ 30c*

1p(Litz)

Primary

47

±0.5 770 µH ±10%

L2

5

6

0.28

Φ* 1c

(TEX-E)

AUX

3

±0.5

L3

9

8

0.1

Φ* 60C*

1p (Litz)

Second

9

±0.5

L4

11

10

0.1

Φ* 60c*

1p (Litz)

Second

9

±0.5

Lk

1

3

0.1

Φ* 30c*

1p (Litz)

Primary

47

±0.5 170 µH ±10%

Sec.short