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11-Feb-13
RDR-91 12 V, 1 A, Universal Input Supply
L
NS
2.00
7
2
7
Number of Primary Layers
Number of Secondary Turns
DC INPUT VOLTAGE PARAMETERS
VMIN
VMAX
79
375
Volts
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
IRMS
0.24
0.5120
0.3075
0.33
Amps
Amps
Amps
Amps
Average Primary Current
Minimum Peak Primary Current
Primary Ripple Current
Primary RMS Current
TRANSFORMER PRIMARY DESIGN PARAMETERS
LP
1050
uHenries
Typical Primary Inductance. +/- 10% to ensure a
minimum primary inductance of 954 uH
LP_TOLERANCE
NP
ALG
10.00
10
56
339
% Primary inductance tolerance
Primary Winding Number of Turns
nH/T^2 Gapped Core Effective Inductance
BM
BAC
2745
824
Gauss
Gauss
Maximum Operating Flux Density, BM<3000 is
recommended
AC Flux Density for Core Loss Curves (0.5 X Peak
to Peak)
ur
LG
BWE
2053
0.11
16.4
Relative Permeability of Ungapped Core
mm Gap Length (Lg > 0.1 mm)
mm Effective Bobbin Width
OD
INS
0.295
0.05
mm
mm
Maximum Primary Wire Diameter including
insulation
Estimated Total Insulation Thickness (= 2 * film
thickness)
DIA
0.243
mm Bare conductor diameter
AWG
31
AWG
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 4.07
ISRMS 2.15
IRIPPLE 1.90
CMS 430
Amps
Amps
Amps
Cmils
Peak Secondary Current
Secondary RMS Current
Output Capacitor RMS Ripple Current
Secondary Bare Conductor minimum circular mils
AWGS
23
AWG
Secondary Wire Gauge (Rounded up to next larger
standard AWG value)
VOLTAGE STRESS PARAMETERS
Maximum Drain Voltage Estimate (Assumes 20%
VDRAIN
607
Volts
zener clamp tolerance and an additional 10%
temperature tolerance)
PIVS
59
Volts
Output Rectifier Maximum Peak Inverse Voltage
Power Integrations
Page 15 of 35
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