Step 1 - Application Variables - Power integrations InnoSwitch3 Application Note

Application Note
Step-by-Step Design Procedure
This design procedure uses the PI Expert design software (available
from Power Integrations), which automatically performs the key
calculations required for an InnoSwitch3 flyback power supply design.
PI Expert allows designers to avoid the typical highly iterative design
process. Look-up tables and empirical design guidelines are provided
in this procedure where appropriate to simplify the design task.
Iterate the design to eliminate warnings. Any parameters outside the
recommended range of values can be corrected by following the
guidance given in the right hand column. Once all warnings have
been cleared, the output transformer design parameters can be used
to create a prototype transformer.
2 APPLICATION VARIABLES
3 VIN_MIN
4 VIN_MAX
5 VIN_RANGE
6 LINEFREQ
7 CAP_INPUT
8 VOUT
9 PERCENT_CDC
10 IOUT
11 POUT
12 EFFICIENCY
13 FACTOR_Z
14 ENCLOSURE
Figure 2. Application Variable Section of InnoSwitch3-CE Design Spreadsheet with Gray Override Cells.
Region
Japan
United States, Canada
Australia, China, European Union Countries,
India, Korea, Malaysia, Russia
Indonesia, Thailand, Vietnam
Rest of Europe, Asia, Africa, Americas
and rest of the world
Visit: https://en.wikipedia.org/wiki/Mains_electricity_by_country
Table 2. Standard Worldwide Input Line Voltage Ranges and Line Frequencies.
4
Rev. A 10/18
85
265
5.00
0%
4.00
0.89
ADAPTER
Nominal Input
Voltage (VAC)
100
120
230
220
115, 120, 127
220, 230
240
Step 1 ‒ Application Variables
Enter: VIN_MIN, VIN_MAX, LINEFREQ, CAP_INPUT, VOUT,
PERCENT_CDC, IOUT, EFFICIENCY, FACTOR_Z, and
ENCLOSURE
Minimum and Maximum Input Voltage, V_MIN, V_MAX (VAC)
Determine the input voltage range from Table 2 for a particular
regional requirement.
Line Frequency, LINEFREQ (Hz)
50 Hz for universal or single 100 VAC, 60 Hz for single 115 VAC input.
50 Hz for single 230 VAC input. These values represent typical line
frequencies rather than minimum. For most applications this gives
adequate overall design margin. For absolute worst-case or based on
the product specification reduce these numbers by 6% (47 Hz or 56 Hz).
Total Input Capacitance, CAP_INPUT (µF)
Enter total input capacitance using Table 3 for guidance.
Design Title
85 V Minimum AC input voltage
265 V Maximum AC input voltage
UNIVERSAL Range of AC input voltage
60 Hz AC Input voltage frequency
40.0 uF Input capacitor
5.00 V Output voltage at the board
Percentage (of output voltage) cable drop
0% compensation desired at full load
4.00 A Output current
20.00 W Output power
AC-DC efficiency estimate at full load given that
the converter is switching at the valley of the
0.89 rectified minimum input AC voltage
0.50 Z-factor estimate
ADAPTER Power supply enclosure
Minimum Input Maximum Input
Voltage (VAC) Voltage (VAC)
85
90
185
185
90
185
185
AN-72
Nominal Line
Frequency (Hz)
132 50 / 60
132 60
265 50
265 50
155 50 / 60
265 50 / 60
265 50
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