DI-23 Datasheet, PDF (2/2 Pages) Power Integrations, Inc. – 10 W, Multi-output, High Speed Modem Power Supply

DI-23
Key Design Points
• Use K (Ripple-to-peak current ratio) in the range of
RP
0.4–0.6 for better efficiency.
• Select V (reflected output voltage) of 90 V to 110 V for
OR
optimum performance.
• Opto with CTR range of 80% to 160% recommended.
• PCB traces which carry high switching voltages and current
should be short and wide to reduce EMI.
• Reduce leakage inductance and improve cross-regulation
by filling each winding layer across the entire width of the
bobbin.
• Use shield windings to improve EMI.
• Use a layer of insulation tape between layers of primary
winding to reduce inter-winding capacitance.
• D5 should be a GP type (glass passivated) to ensure a
controlled reverse recovery time.
TRANSFORMER PARAMETERS
Core Material
Bobbin
Winding Details
Winding Order
(Pin Numbers)
Inductance
Primary Resonant
Frequency
EE25, Nippon Ceramic NC-2H or
equivalent, A_LG = 351 nH/T²
YW-360-02B, YIH-HWA, 10 pin Vertical
Shield: 15T, 2 x 29 AWG
Primary: 49T, 27 AWG
Bias: 7T, 3 x 28 AWG
3.3 V: 2T, 3 x 26 AWG T.I.W.
5 V: 1T, 26 AWG T.I.W.
30 V: 13T, 26 AWG T.I.W.
(T.I.W. = Triple Insulated Wire)
Shield (1-NC), 3 x tape, Primary (2-1),
with tape between layers, tape,
Bias (5-4), 6 x tape, 3.3 V (6-7),
tape, 5 V (9-6), tape, 30 V (10-9),
2 x tape, Shield (1-3), 3 x tape
Primary: 1 mH ±10%,
Leakge: 30 µH (maximum)
500 kHz (minimum)
Table 1. Transformer Construction Information.
Load
Regulation (%)
V_O
Range
(Amp) -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
3.3 0.3-1.5
5 0.3-0.9
30 0.01-0.03
Table 2. Worst Case Output Cross-Regulation - Outputs Taken
from Minimum to Maximum Load.
80
70
QP
60
50
AV
Quasi Peak
40
30
20
10
0
Average
-10
-20
0.15
1.0
10.0
MHz
130.0
Figure 2. Conducted Emissions – EN55022 Class B (QP and AV),
230 VAC, Full Load, Artificial Hand Connected to
Secondary Return.
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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.
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