DER-50
Set Top Box Design using TOP245R
April 20, 2005
8 Transformer Spreadsheets
INPUT
INFO
OUTPUT
UNIT
ENTER APPLICATION VARIABLES
VACMIN
VACMAX
fL
VO
PO
n
Z
VB
tC
90
264
50
3.3
29.64
0.8
0.5
17
Volts
Volts
Hertz
Volts
Watts
Volts
mSeconds
uFarads
3
100
CIN
ENTER TOPSWITCH-GX
VARIABLES
TOP-GX
Chosen Device
top245
Universal
60W
TOP245
Power Out
KI
0.85
ILIMITMIN
ILIMITMAX
1.38Amps
1.68Amps
Frequency - (F)=132kHz, (H)=66kHz
f
fS
132000.00Hertz
124000.00Hertz
140000.00Hertz
Volts
fSmin
fSmax
VOR
VDS
VD
120
10
0.7
0.7
0.8
Volts
Volts
Volts
VDB
KP
ENTER TRANSFORMER CORE/CONSTRUCTION
VARIABLES
Core Type
ef25
Core
EF25
P/N:
EF25_BOBBI
N
Bobbin
AE
LE
P/N:
0.52cm^2
5.78cm
AL
BW
M
L
NS
2000.00nH/T^2
15.60mm
mm
3
2
2
DC INPUT VOLTAGE PARAMETERS
VMIN
VMAX
104.94Volts
373.35Volts
CURRENT WAVEFORM SHAPE
PARAMETERS
DMAX
IAVG
IP
IR
IRMS
0.56
0.35Amps
1.05Amps
0.84Amps
0.51Amps
TRANSFORMER PRIMARY DESIGN
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
Page 15 of 31
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