Power integrations InnoSwitch3 Application Note
Text of the manual
Application Note AN-72
InnoSwitch3 Family
www.power.com
October 2018
Design Guide
Introduction
InnoSwitch™3 devices combine a high-voltage power MOSFET switch,
with both primary-side and secondary-side controllers, an innovative
high-speed magneto-coupling communications technology and a
synchronous rectification driver into one isolated, safety-rated dev
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Figure 1.
Typical Adapter Power Supply Schematic using InnoSwitch3 with Line Undervoltage Lockout, Line Overvoltage Shutdown, Constant Output Current Limit
and Quasi-Resonant Synchronous MOSFET Rectifier and Integrated Output Overvoltage Protection.
Basic Circuit Configuration
The circuit in Figure 1 shows
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Table 1.
Output Power Tables of InnoSwitch3-CE and EP.
• Enter AC input voltage range and line frequency, VAC_MIN [B3],
VAC_MAX [B4], LINEFREQ [B6]
• Enter input capacitance, CAP_INPUT [B7]
• 3 µF / W for universal (85-265 VAC) or single (100/115 VAC) line.
A more aggressive value of 2 µF / W can
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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
proce
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The capacitance is used to calculate the minimum and maximum DC
voltage across the bulk capacitor and should be selected to keep the
minimum DC input voltage, VMIN > 70 V.
Nominal Output Voltage, VOUT (V)
Enter the nominal output voltage of the main output at full load.
Usually the main output is the output
