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AN3407 Fiches technique(PDF) 22 Page - STMicroelectronics

No de pièce AN3407
Description  Resonant driver for LED SMPS demonstration board
PDF  25 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3407 Fiches technique(HTML) 22 Page - STMicroelectronics

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Transformer specifications
AN3407
22/25
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
112.0 mm2
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



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