EPR-93 Datasheet, PDF (17/40 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 93 - 32 W/81 W Peak Supply Using PeakSwitch- (PKS606Y)

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
Core
Bobbin
AE
LE
AL
BW
M
L
NS
EE25
P/N:
EE25_BOBBIN P/N:
0.404 cm^2
7.34 cm
1420 nH/T^2
10.20 mm
0.00 mm
3
10
10
User Selected Core Size(Verify
acceptable thermal rise under continuous
load conditions)
PC40EE25-Z
EE25_BOBBIN
Core Effective Cross Sectional Area
Core Effective Path Length
Ungapped Core Effective Inductance
Bobbin Physical Winding Width
Safety Margin Width (Half the Primary to
Secondary Creepage Distance)
Number of Primary Layers
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
IAVG
IP
IR
IRMS
0.62
1.34 Amps
2.60 Amps
1.31 Amps
1.80 Amps
!!! Info. ON-Time Extension feature
invoked. Verify this design for acceptable
electrical and thermal performance on the
bench
Average Primary Current
Minimum Peak Primary Current
Primary Ripple Current
Primary RMS Current
TRANSFORMER PRIMARY DESIGN PARAMETERS
LP
LP_TOLERANCE
NP
ALG
Target BM
BM
BAC
ur
LG
BWE
OD
INS
DIA
AWG
CM
CMA
10.00
132 uHenries Typical Primary Inductance. +/- 10% to
ensure a minimum primary inductance of
119 uH
10 %
Primary inductance tolerance
39
Primary Winding Number of Turns
88 nH/T^2 Gapped Core Effective Inductance
3000 Gauss Target Peak Flux Density at Maximum
Current Limit
2523 Gauss Calculated Maximum Operating Flux
Density, BM < 3000 is recommended
635 Gauss AC Flux Density for Core Loss Curves
(0.5 X Peak to Peak)
2053
Relative Permeability of Ungapped Core
0.54 mm
Gap Length (Lg > 0.1 mm)
30.6 mm
Effective Bobbin Width
0.79 mm
Maximum Primary Wire Diameter
including insulation
0.08 mm
Estimated Total Insulation Thickness
(= 2 * film thickness)
0.71 mm
Bare conductor diameter
22 AWG Primary Wire Gauge (Rounded to next
smaller standard AWG value)
645 Cmils Bare conductor effective area in circular
mils
358 Cmils/ Primary Winding Current Capacity
Amp (100 < CMA < 500)
Page 17 of 40
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