EP-93 – 30 V, 1.07 A, 2.7 A (peak), Universal Input Supply
22-Jun-2006
8 Transformer Spreadsheet
ACDC_PeakSwitch_0 INPUT
31006; Rev.1.1;
©Copyright Power
Integrations 2006
INFO
OUTPUT UNIT
ACDC_PeakSwitch_031006_Rev1-1.xls; PeakSwitch
Continuous/Discontinuous Flyback Transformer Design
Spreadsheet
ENTER APPLICATION VARIABLES
VACMIN
VACMAX
fL
90
265
50
Volts
Volts
Hertz
Volts
Minimum AC Input Voltage
Maximum AC Input Voltage
AC Mains Frequency
Nominal Output Voltage (at continuous power)
Nominal Output
Voltage (VO)
Maximum Output
Current (IO)
Minimum Output
Voltage at Peak Load
Continuous Power
Peak Power
n
30.00
2.71
27.00
32.00
0.75
Amps
Power Supply Output Current (corresponding to peak power)
27.00 Volts
Minimum Output Voltage at Peak Power (Assuming output droop
during peak load)
Continuous Output Power
Peak Output Power
Efficiency Estimate at output terminals and at peak load.
Enter 0.7 if no better data available
32.00 Watts
73.17 Watts
Z
0.60
Loss Allocation Factor (Z = Secondary side losses / Total losses)
tC Estimate
CIN
3.00
150.00
mSeconds Bridge Rectifier Conduction Time Estimate
150 uFarads
Input Capacitance
ENTER PeakSwitch VARIABLES
PeakSwitch
Chosen Device
ILIMITMIN
ILIMITMAX
fSmin
PKS606Y
PKS606Y
PKS606Y
PeakSwitch device
2.600 Amps
Minimum Current Limit
Maximum Current Limit
Minimum Device Switching Frequency
I^2f (product of current limit squared and frequency is trimmed for
tighter tolerance)
3.000 Amps
250000 Hertz
1955 A^2kHz
I^2fmin
VOR
VDS
VD
VDB
120.00
8.00
1.00
120 Volts
8 Volts
1 Volts
0.7 Volts
170 Volts
0.50
Reflected Output Voltage (VOR <= 135 V Recommended)
PeakSwitch on-state Drain to Source Voltage
Output Winding Diode Forward Voltage Drop
Bias Winding Diode Forward Voltage Drop
Nominal Clamp Voltage
Ripple to Peak Current Ratio (KP < 6)
Ripple to Peak Current Ratio under worst case at peak load
(0.25 < KP < 6)
VCLO
KP (STEADY STATE)
KP (TRANSIENT)
170
0.30
ENTER UVLO VARIABLES
V_UV_TARGET
89 Volts
92 Volts
Target DC under-voltage threshold, above which the power supply
will start
Typical DC start-up voltage based on standard value of
RUV_ACTUAL
V_UV_ACTUAL
RUV_IDEAL
RUV_ACTUAL
3.47 Mohms
3.60 Mohms
Calculated value for UV Lockout resistor
Closest standard value of resistor to RUV_IDEAL
BIAS WINDING VARIABLES
VB
NB
PIVB
15.00 Volts
5
Bias winding Voltage
Number of Bias Winding Turns
Bias Rectifier Maximum Peak Inverse Voltage
63 Volts
Power Integrations
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