7-Feb-2006
EP-91 12 V, 1 A, Universal Input Supply
BW
M
10.2 mm
1 mm
Bobbin Physical Winding Width
Safety Margin Width (Half the Primary to Secondary
Creepage Distance)
1.00
L
NS
2.00
7
2
7
Number of Primary Layers
Number of Secondary Turns
DC INPUT VOLTAGE PARAMETERS
VMIN
VMAX
79 Volts
375 Volts
Minimum DC Input Voltage
Maximum DC Input Voltage
CURRENT WAVEFORM SHAPE PARAMETERS
DMAX
0.59
Duty Ratio at full load, minimum primary inductance
and minimum input voltage
IAVG
IP
IR
0.24 Amps
0.5120 Amps
0.3075 Amps
0.33 Amps
Average Primary Current
Minimum Peak Primary Current
Primary Ripple Current
IRMS
Primary RMS Current
TRANSFORMER PRIMARY DESIGN PARAMETERS
LP
1050 uHenries
Typical Primary Inductance. +/- 10% to ensure a
minimum primary inductance of 954 uH
Primary inductance tolerance
Primary Winding Number of Turns
Gapped Core Effective Inductance
Maximum Operating Flux Density, BM<3000 is
recommended
LP_TOLERANCE
NP
ALG
BM
10.00
10 %
56
339 nH/T^2
2745 Gauss
BAC
824 Gauss
AC Flux Density for Core Loss Curves (0.5 X Peak
to Peak)
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
0.11 mm
16.4 mm
0.295 mm
INS
0.05 mm
Estimated Total Insulation Thickness (= 2 * film
thickness)
DIA
AWG
0.243 mm
31 AWG
Bare conductor diameter
Primary Wire Gauge (Rounded to next smaller
standard AWG value)
CM
81 Cmils
Bare conductor effective area in circular mils
CMA
247 Cmils/Amp Primary Winding Current Capacity (200 < CMA <
500)
TRANSFORMER SECONDARY DESIGN PARAMETERS
Lumped parameters
ISP
ISRMS
4.07 Amps
2.15 Amps
Peak Secondary Current
Secondary RMS Current
IRIPPLE
CMS
AWGS
1.90 Amps
430 Cmils
23 AWG
Output Capacitor RMS Ripple Current
Secondary Bare Conductor minimum circular mils
Secondary Wire Gauge (Rounded up to next larger
standard AWG value)
VOLTAGE STRESS PARAMETERS
VDRAIN
607 Volts
59 Volts
Maximum Drain Voltage Estimate (Assumes 20%
zener clamp tolerance and an additional 10%
temperature tolerance)
PIVS
Output Rectifier Maximum Peak Inverse Voltage
Power Integrations
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