DI-66
Effective EMI filtering is accomplished with only five parts
(L1, CX1, CY1-CY3), due to the built-in frequency jitter
function of TOPSwitch-GX.
TRANSFORMER PARAMETERS
Samwha EER3016S-PL-7
Core
ALG of 342 nH/T2
10 Pin, EER3016S
Bobbin
Key Design Points
1/2 Primary: 28 T, 26 AWG
Bias: 7T, 2 x 26 AWG
12 V Secondary, 4T, 2 x 25 AWG
Triple Insulated Wire
5 V Secondary: 3T, 3 x 25 AWG
Triple Insulated Wire
1/2 Primary: 24T, 26 AWG
• Use 66 kHz operation to reduce standby power loss.
• To reduce the number of primary turns required for
66 kHz operation, the Ae of the T1 core must be large.
Recommended cores are EER3016S and PQ2620.
• Split-primary transformer construction should be used to
keep leakage inductance to a minimum.
• Use an RCD snubber with the normal recovery diode. Size
resistors R2 and R3 for the highest value that ensures
adequatedrainvoltagemarginunderoverloadconditionsat
high line.
Winding Details
1/2 Primary: 2-5, tape 1L
Bias: 3-4, tape 2L
12 V Secondary: 10-6,7
5 V Secondary: 6,7-8,9, tape 2L
1/2 Primary: 5-1, tape 3L
Winding Order
(pin numbers)
Primary Inductance
919 µH ±10%
1.1 MHz (Min)
18 µH (Max)
Primary Resonant
Frequency
Leakage Inductance
Table 1. Transformer Construction Information.
80
70
1.2
1.1
(QP)
(AV)
60
50
1
0.9
0.8
0.7
0.6
40
30
20
230 VAC
115 VAC
10
0.5
0.4
0.3
0.2
Quasi-Peak Scan
0
Average Scan
-10
-20
0.15
1
10
70
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7
Output Power (W)
Frequency (MHz)
Figure 2. Conducted EMI, CISPR22B Limits, Maximum Load, Secondary
Return Connected to Safety Ground, 230 VAC Input.
Figure 3. Pin vs. Pout, 5 V Output Loaded, No Load
on 12 V Output.
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PowerIntegrationsmaymakechangestoitsproductsatanytime. PowerIntegrationshasnoliabilityarisingfromyouruseofanyinformation, deviceorcircuitdescribed
herein nor does it convey any license under its patent rights or the rights of others. POWER INTEGRATIONS MAKES NO WARRANTIES HEREIN AND SPECIFICALLY
DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS. The products and applications illustrated herein (including circuits external to the products and transformer
construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power Integrations.
A complete list of Power Integrations' patents may be found at www.powerint.com.
The PI logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch and EcoSmartare registered trademarks of Power Integrations. PI Expertand
PI FACTS are trademarks of Power Integrations. Copyright 2004, Power Integrations
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12/04
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