EPR-34 Datasheet, PDF (14/28 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 34 - Single Output 30 W AC-DC Power Supply

EPR-34 – 12 V, 30 W, Universal Input
10-Feb-2004
Transformer Construction
Parameters
Core/Bobbin
E25/13/7 (EF25)
Margi
Core Manuf.
Generic
Bobbin Manuf
Generic
LP
uHenries
827
NP
58
NB
7.54
AWG
AWG
27
CMA
VOR
BW
M
L
AE
ALG
BM
BP
BAC
LG
LL
Cmils/A
Volts
mm
mm
cm^2
nH/T^2
Gauss
Gauss
Gauss
mm
uHenries
322
120.00
15.30
1.0
2.0
0.53
249
2693
3688
539
0.23
12.4
LSEC
nHenries
Secondary
Parameters
NSx
Rounded Down NSx
Rounded Down Volts
Vox
Rounded Up NSx
20
6.00
Rounded Up Volts
Vox
AWGSx Range AWG
17 -
21
Core and Bobbin Type
Core Manufacturing
Bobbin Manufacturing
Primary Inductance
Primary Winding Number of Turns
Bias Winding Number of Turns
Primary Wire Gauge (Rounded to next smaller
standard AWG value)
Primary Winding Current Capacity
Reflected Output Voltage
Bobbin Physical Winding Width
Safety Margin Width
Number of Primary Layers
Core Effective Cross Section Area
Gapped Core Effective Inductance
Maximum Operating Flux Density
Peak Flux Density
AC Flux Density for Core Curves
Gap Length
Estimated Transformer Primary Leakage
Inductance
Estimated Secondary Trace Inductance
4.56 Secondary Number of Turns
4 Rounded to Integer Secondary Number of Turns
7.83 Auxiliary Output Voltage for Rounded to Integer
NSx
5 Rounded to Next Integer Secondary Number of
Turns
9.92 Auxiliary Output Voltage for Rounded to Next
Integer NSx
40 - Secondary Wire Gauge Range
44 Comment: Primary wire gauge is less than
recommended minimum (26 AWG) and may
overheat
Tip: Consider a parallel winding technique (bifilar,
trifilar), increase size of transformer (larger BW) or
reduce margin (M).
Comment: Wire
Power Integrations
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www.powerint.com
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