TOP245P_1 POWERINT [Power Integrations, Inc.], TOP245P_1 Datasheet - Page 12

• Manufacturer Part Number: TOP245P_1
• Description: Title 32W (47W peak) Multiple Output supply
• Manufacturer: POWERINT [Power Integrations, Inc.]

DER-19
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
VACMAX
FL
TC
Z
N
Power Supply
Outputs
VOx
IOx
VB
IB
Device Variables
Device
PO
VDRAIN
FS
KRPKDP
KI
IP
IRMS
DMAX
Power Supply Components
Selection
CIN
Power Integrations, Inc.
Tel: [phone] Fax: [phone]
www.powerint.com
Volts
Volts
Hertz
mSeconds
%
Volts
Amps
Volts
Amps
Watts
Volts
Hertz
Amps
Amps
uFarads
TOP245P
TOP245P Multiple Output Set Top Box
132000
15.00
0.006
31.99
1.81
0.68
74.0
0.70
1.00
0.75
0.31
0.36
47.0
195
265
678
50
3.000
3.30
2.000
5.00
12.00 20.00 Output Voltage
0.500 0.300 Output Current
Min Input AC Voltage
Max Input AC Voltage
AC Main Frequency
Bridge Rectifier
Conduction Time
Estimate
Loss Allocation Factor
Efficiency Estimate
Bias Voltage
Bias Current
Device Name
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
Input Filter Capacitor
March 30, 2004
Page 12 of 25