TOP245P_1 Datasheet, PDF (12/25 Pages) Power Integrations, Inc. – Title 32W (47W peak) Multiple Output supply

DER-19
TOP245P Multiple Output Set Top Box
March 30, 2004
8 Transformer Spreadsheets
This design was produced using PIExpert assuming a TOP245P device with a current
limit capability of 1.1A and an Rdson of 4Ω. The data below reflects the full continuous
load, which gives approximately 0.7A peak primary current. The transformer has been
designed to operate with safe flux levels with primary currents of up to 1.2A allowing for
the peak power capability.
Power Supply Input
VACMIN
Volts
195
VACMAX
Volts
265
FL
Hertz
50
TC
mSeconds
1.81
Z
0.68
N
%
74.0
Min Input AC Voltage
Max Input AC Voltage
AC Main Frequency
Bridge Rectifier
Conduction Time
Estimate
Loss Allocation Factor
Efficiency Estimate
Power Supply
Outputs
VOx
Volts
IOx
Amps
VB
Volts
IB
Amps
15.00
0.006
3.30
3.000
5.00
2.000
12.00
0.500
20.00 Output Voltage
0.300 Output Current
Bias Voltage
Bias Current
Device Variables
Device
TOP245P
Device Name
PO
VDRAIN
Watts
Volts
31.99
678
FS
KRPKDP
KI
IP
IRMS
DMAX
Hertz
Amps
Amps
132000
0.70
1.00
0.75
0.31
0.36
Total Output Power
Maximum Drain Voltage
Estimate (Includes
Effect of Leakage
Inductance)
Device Switching
Frequency
Ripple to Peak Current
Ratio
External Current Limit
Ratio
Peak Primary Current
Primary RMS Current
Maximum Duty Cycle
Power Supply Components
Selection
CIN
uFarads
47.0
Input Filter Capacitor
Power Integrations, Inc.
Tel: [phone] Fax: [phone]
www.powerint.com
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