DI-33
1200
1000
800
115 VAC
230 VAC
TRANSFORMER PARAMETERS
Core Material
Bobbin
Himag MZ4 EEL25.4, or equivalent,
Gap for AL of 344 nH/T2
EEL25 Vertical 14 Pins
600
400
200
0
0 100 200 300 400 500 600 700 800
POUT (mW)
Figure 2. P vs. P Curve.
IN
OUT
80
70
60
QP
AV
50
40
Quasi Peak
30
20
10
Average
0
Winding Details
Winding Order
(Pin Numbers)
Inductance
Primary Resonant
Frequency
(Pins 1-4, all other open)
Shield: 32T, 2 x 32 AWG
Primary: 64T, 2 x 32 AWG
Bias: 6T, 4 x 32 AWG
Shield 2: 4T, 4 x 32 AWG
+12 V: 4T, 4 x 32 AWG
+5 V: 1T, 14 mm Cu Foil
+3.3 V: 2T, 14 mm Cu Foil
-12 V: 7T, 4 x 32 AWG
3 mm margin tape on both
sides of bobbin.
Shield (NC-5), tape,
Primary (1-4), tape,
Bias (7-6), tape,
Shield (NC-7), tape,
12 V (13-8), 3.3 V (11-9),
5 V (9-13), tape,
-12 V (14-11), tape
(NC - no connect)
1420 µH ±25%
500 kHz (minimum)
Table 1. Transformer Construction Information.
-10
-20
0.15
1.0
10.0
MHz
-100.0
Figure 3. Conducted EMI with Artificial Hand Connected to Output Return.
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Integrations’ patents may be found at www.powerint.com.
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PI Expert is a trademark of Power Integrations, Inc. ©Copyright 2002, Power Integrations, Inc.
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