EPR-91 Datasheet, PDF (17/36 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-91 - 12 W Power Supply using

7-Feb-2006
EP-91 12 V, 1 A, Universal Input Supply
BW
10.2 mm
Bobbin Physical Winding Width
M
1.00
1 mm
Safety Margin Width (Half the Primary to Secondary
Creepage Distance)
L
2.00
2
Number of Primary Layers
NS
7
7
Number of Secondary Turns
VMIN
VMAX
DC INPUT VOLTAGE PARAMETERS
79 Volts
375 Volts
Minimum DC Input Voltage
Maximum DC Input Voltage
CURRENT WAVEFORM SHAPE PARAMETERS
DMAX
IAVG
IP
IR
IRMS
0.59
0.24 Amps
0.5120 Amps
0.3075 Amps
0.33 Amps
Duty Ratio at full load, minimum primary inductance
and minimum input voltage
Average Primary Current
Minimum Peak Primary Current
Primary Ripple Current
Primary RMS Current
TRANSFORMER PRIMARY DESIGN PARAMETERS
LP
LP_TOLERANCE
NP
ALG
BM
10.00
BAC
ur
LG
BWE
OD
INS
DIA
AWG
CM
CMA
1050 uHenries Typical Primary Inductance. +/- 10% to ensure a
minimum primary inductance of 954 uH
10 %
Primary inductance tolerance
56
Primary Winding Number of Turns
339 nH/T^2 Gapped Core Effective Inductance
2745 Gauss
Maximum Operating Flux Density, BM<3000 is
recommended
824 Gauss
AC Flux Density for Core Loss Curves (0.5 X Peak
to Peak)
2053
Relative Permeability of Ungapped Core
0.11 mm
Gap Length (Lg > 0.1 mm)
16.4 mm
Effective Bobbin Width
0.295 mm
Maximum Primary Wire Diameter including
insulation
0.05 mm
Estimated Total Insulation Thickness (= 2 * film
thickness)
0.243 mm
Bare conductor diameter
31 AWG
Primary Wire Gauge (Rounded to next smaller
standard AWG value)
81 Cmils
Bare conductor effective area in circular mils
247 Cmils/Amp Primary Winding Current Capacity (200 < CMA <
500)
TRANSFORMER SECONDARY DESIGN PARAMETERS
Lumped parameters
ISP
ISRMS
IRIPPLE
CMS
AWGS
4.07 Amps
2.15 Amps
1.90 Amps
430 Cmils
23 AWG
Peak Secondary Current
Secondary RMS Current
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
PIVS
607 Volts
59 Volts
Maximum Drain Voltage Estimate (Assumes 20%
zener clamp tolerance and an additional 10%
temperature tolerance)
Output Rectifier Maximum Peak Inverse Voltage
Page 17 of 36
Power Integrations
Tel: [phone] Fax: [phone]
www.powerint.com