UM10412
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© NXP B.V. 2010. All rights reserved.
User manual
Rev. 1 — 2 November 2010
15 of 26
NXP Semiconductors
UM10412
UBA2021 evaluation board
6.2 Transformer
T3
6.2.1 Schematic diagram
•
Manufacturer: Würth Elektronik
•
Part number: 760870402
Fig 11. Transformer T1
019aaa251
21.59 mm
(max)
21.59 mm
(max)
17.27 mm
(max)
12
11
10
1
2
3
4
5
6
7
8
9
Fig 12. Transformer T3 schematic diagram
019aaa302
N7
9
10
7
8
6
1
2
N6
N1
N2
3
N3
4
N4
5
N5
Table 14.
Electrical characteristics for transformer T3
Properties
Test conditions
Value
Unit
Tolerance
InductanceN1-N5
50 kHz/0.1 V
L
0
4.0
mH
±
5
%
Turns ratio N1 - N5
N1: N2: N3: N4: N5: N6: N7
TR
12 : 1.33, 1.25 : 1.17, 1.17 : 1:1
±
3
%
DC-resistance N1-N5
at 20
°
C
R
DC1-5
1.85
Ω
±
20
%
DC-resistanceN6
at 20
°
C
R
DC6
135
m
Ω
±
20
%
DC-resistance N7
at 20
°
C
R
DC7
140
m
Ω
±
20
%
Saturation current N1-N5
dL/L = 20
%
I
SAT
1.0
A
typical
Leakage inductance N1-N5
200 kHz/0.1 V rest shorted
L
S
275
μ
H
typical
Coupling capacitance
20 kHz/1 V all windings
C
WW
30.0
pF
typical
Hipot test
3 mA, 1 s all windings
HV
3.0
kV
