EPR-12 Datasheet, PDF (26/40 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-12 - 145 W PC Forward Converter with TOP247 and 10 W 5 V Output Standby Flyback with TNY266

EPR-12 – PC Forward Converter with Standby Flyback Power Supply
01-Feb-05
DIODE Vf SELECTION
VDMAIN
VDMAINMA
VDAUX1
VDIND1
VDB
BRIDGE RECTIFIER DIODE
SELECTION
VPIVAC
IDAVBR
TRANSFORMER CORE SELECTION
Core Type
Core
Bobbin
AE
LE
AL
BW
LG MAX
R FACTOR
M
L
NMAIN
eer28l
EER28L
EER28L_
BC
9%
3.0
0.80
TRANSFORMER DESIGN
PARAMETERS
NP
45
NB
NAUX1
VAUX1 ACTUAL
NIND1
VIND1 ACTUAL
BM
BP
LP MIN
IMAG
OD_P
AWG_P
0.5 Volts
0.5 Volts
0.7 Volts
0 Volts
0.7 Volts
Main output rectifiers forward voltage drop
(Schottky)
Magamp output rectifiers forward voltage
drop (Schottky)
Auxiliary output rectifiers forward voltage
drop (Ultrafast)
Independent output rectifiers forward voltage
drop (Schottky)
Bias output rectifier conduction drop
467 Volts
0.773 Amps
Maximum voltage across Bridge rectifier
diode
Average Bridge Rectifier Current
P/N:
P/N:
0.814 cm^2
7.55 cm
2520 nH/T^2
21.8 mm
0.02 mm
9% %
mm
3
PC40EER28L-Z
BEER-28L-112CPH
Core Effective Cross Sectional Area
Core Effective Path Length
Ungapped Core Effective Inductance
Bobbin Physical Winding Width
Maximum actual gap when zero gap
specified
Percentage of total PS losses lost in
transformer windings; default 10%
Transformer margin
Transformer primary layers
Main rounded turns
45
6
4
11.63 Volts
0
0.00 Volts
Primary rounded turns
Bias turns to maintain 8V minimum input
voltage, light load
Auxiliary rounded turns (DC stacked on
Main winding)
Approx. Aux output voltage with NASUX1 =
4 Turns and DC stack
Independent rounded turns (separate
winding)
Approximate independent output voltage
with NIND1 = 0 turns
1816 Gauss
2884 Gauss
3.419 mHenries
0.189 Amps
0.33 mm
28 AWG
Maximum operating flux density at minimum
switching frequency
Maximum peak flux density at minimum
switching frequency
Minimum primary magnetizing inductance
(assumes LGMAX=20um)
Peak magnetizing current at minimum input
voltage
Primary wire outer diameter
Primary Wire Gauge (rounded to maximum
AWG value)
Power Integrations
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