DER-94
LCD Monitor Internal Supply
September 12, 2005
NS
3
Number of Secondary Turns
DC INPUT VOLTAGE PARAMETERS
VMIN
VMAX
98
375
98 Volts
375 Volts
Minimum DC Input Voltage
Maximum DC Input Voltage
CURRENT WAVEFORM SHAPE PARAMETERS
DMAX
IAVG
IP
IR
IRMS
0.51
0.57
1.75
1.22
0.84
0.51
Maximum Duty Cycle
Average Primary Current
Peak Primary Current
Primary Ripple Current
Primary RMS Current
0.57 Amps
1.75 Amps
1.22 Amps
0.84 Amps
TRANSFORMER PRIMARY DESIGN PARAMETERS
LP
NP
594
49
594 uHenries Primary Inductance
49
Primary Winding Number of
Turns
NB
7
247
7
Bias Winding Number of
Turns
Gapped Core Effective
Inductance
Maximum Flux Density at
PO, VMIN (BM<3000)
Peak Flux Density
(BP<4200)
AC Flux Density for Core
Loss Curves (0.5 X Peak to
Peak)
ALG
BM
247 nH/T^2
2572 Gauss
3502 Gauss
900 Gauss
2572
3502
900
BP
BAC
ur
1780
1780
Relative Permeability of
Ungapped Core
LG
BWE
OD
0.38
22.4
0.46
0.38 mm
22.4 mm
0.46 mm
Gap Length (Lg > 0.1 mm)
Effective Bobbin Width
Maximum Primary Wire
Diameter including insulation
Estimated Total Insulation
Thickness (= 2 * film
thickness)
INS
0.06
0.06 mm
DIA
AWG
0.39
27
0.39 mm
27 AWG
Bare conductor diameter
Primary Wire Gauge
(Rounded to next smaller
standard AWG value)
Bare conductor effective
area in circular mils
CM
203
241
203 Cmils
CMA
241 Cmils/Amp Primary Winding Current
Capacity (200 < CMA <
500)
TRANSFORMER SECONDARY DESIGN PARAMETERS (SINGLE OUTPUT / SINGLE OUTPUT EQUIVALENT)
Lumped parameters
ISP
ISRMS
IO
28.56
13.67
9.00
28.56 Amps
13.67 Amps
9.00 Amps
Peak Secondary Current
Secondary RMS Current
Power Supply Output
Current
IRIPPLE
10.29
10.29 Amps
Output Capacitor RMS
Ripple Current
CMS
2735
15
2735 Cmils
15 AWG
Secondary Bare Conductor
minimum circular mils
Secondary Wire Gauge
(Rounded up to next larger
standard AWG value)
Secondary Minimum Bare
Conductor Diameter
Secondary Maximum
Outside Diameter for Triple
Insulated Wire
AWGS
DIAS
ODS
1.45
3.73
1.45 mm
3.73 mm
INSS
1.14
1.14 mm
Maximum Secondary
Insulation Wall Thickness
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
Page 18 of 34
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