DI-21
80
70
60
50
40
30
• Capacitor C12 is added to eliminate output start-up
overshoot.
• Feedback compensation is accomplished with C11 and
R12 across TL431 reference amplifier U3 and correct
choice of optocoupler series resistor R10.
QP Limit Line
AV Limit Line
TRANSFORMER PARAMETERS
20
-10
0
EE30
TDK PC40EE30-Z or equivalent,
Core Material
Gap for ALG of 1045 nH/T2
Quasi-Peak Scan
Average Scan
E130 12 pin
Bobbin
EN_V_QP
EN_V_AV
-10
-20
(Yih Hwa YW-016 or equivalent)
Shield: 10T, 2 x 28 AWG
Primary: 22T, 25 AWG
0.15
1
10
30
Winding Details
Bias: 3T, 4 x 28 AWG
Secondary: 3T, 5 x 25 AWG T.I.W.
(T.I.W. = Triple Insulated Wire)
Frequency (MHz)
Figure 2. 115 V Conducted EMI for LCD Monitor Supply. Meets
FCC Part 15 Class B.
Tape, Shield (2-3), Tape, Primary
(4-1), Tape, Bias (6-5), Tape,
Secondary
Winding Order
(Pin Numbers)
80
70
(7,8,9-10,11,12), Tape
QP Limit Line
AV Limit Line
60
50
Primary: 490 µH ± 10%,
Leakage: 6 µH (maximum)
Inductance
Primary Resonant Frequency
2 MHz (minimum)
40
30
Table 1. Transformer Construction Information.
20
-10
Quasi-Peak Scan
0
Average Scan
EN_V_QP
-10
EN_V_AV
-20
0.15
1
10
30
Frequency (MHz)
Figure 3. 230 V Conducted EMI for LCD Monitor Supply. Meets
EN55022 EMI spec.
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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 2003, Power Integrations, Inc.
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