22-Jun-2006
EP-93 – 30 V, 1.07 A, 2.7 A (peak), Universal Input Supply
ENTER TRANSFORMER CORE/CONSTRUCTION VARIABLES
Core Type
EE25
EE25
User Selected Core Size(Verify
acceptable thermal rise under continuous
load conditions)
Core
Bobbin
AE
EE25
P/N:
PC40EE25-Z
EE25_BOBBIN
Core Effective Cross Sectional Area
Core Effective Path Length
EE25_BOBBIN P/N:
0.404 cm^2
LE
7.34 cm
AL
1420 nH/T^2 Ungapped Core Effective Inductance
BW
M
10.20 mm
0.00 mm
Bobbin Physical Winding Width
Safety Margin Width (Half the Primary to
Secondary Creepage Distance)
Number of Primary Layers
L
3
NS
10
10
Number of Secondary Turns
DC INPUT VOLTAGE PARAMETERS
VMIN
VMAX
81 Volts
375 Volts
Minimum DC Input Voltage
Maximum DC Input Voltage
CURRENT WAVEFORM SHAPE PARAMETERS
DMAX
ON-Time
Extension
0.62
!!! Info. ON-Time Extension feature
invoked. Verify this design for acceptable
electrical and thermal performance on the
bench
IAVG
IP
IR
1.34 Amps
2.60 Amps
1.31 Amps
1.80 Amps
Average Primary Current
Minimum Peak Primary Current
Primary Ripple Current
IRMS
Primary RMS Current
TRANSFORMER PRIMARY DESIGN PARAMETERS
LP
132 uHenries Typical Primary Inductance. +/- 10% to
ensure a minimum primary inductance of
119 uH
LP_TOLERANCE
NP
10.00
10 %
39
Primary inductance tolerance
Primary Winding Number of Turns
ALG
88 nH/T^2 Gapped Core Effective Inductance
Target BM
3000 Gauss
2523 Gauss
635 Gauss
Target Peak Flux Density at Maximum
Current Limit
Calculated Maximum Operating Flux
Density, BM < 3000 is recommended
AC Flux Density for Core Loss Curves
(0.5 X Peak to Peak)
BM
BAC
ur
LG
BWE
OD
2053
Relative Permeability of Ungapped Core
Gap Length (Lg > 0.1 mm)
Effective Bobbin Width
Maximum Primary Wire Diameter
including insulation
0.54 mm
30.6 mm
0.79 mm
INS
0.08 mm
Estimated Total Insulation Thickness
(= 2 * film thickness)
DIA
AWG
0.71 mm
22 AWG
Bare conductor diameter
Primary Wire Gauge (Rounded to next
smaller standard AWG value)
Bare conductor effective area in circular
mils
CM
645 Cmils
CMA
358 Cmils/
Amp
Primary Winding Current Capacity
(100 < CMA < 500)
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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