UG332: Class 3 Non-Isolated Evaluation
Board for the Si3406
The Si3406 non-isolated Flyback topology based evaluation board
is a reference design for a power supply in a Power over Ethernet
(PoE) Powered Device (PD) application.
This Si3406-non-ISO-FB EVB maximum output level is Class 3 power (η x 15.4 W).
The Si3406-non-ISO-FB EVB board is shown below. The Si3406 IC integrates an IEEE
802.03at compatible PoE interface as well as a current control based dc/dc converter.
The Si3406 PD integrates two diode bridges, which can be used up to 200 mA input cur-
rent, detection circuit, classification circuit, dc/dc switch, hot-swap switch, TVS overvolt-
age protection, dynamic soft-start circuit, cycle-by-cycle current limit, syncrhonous gate
driver, maintain power signature (MPS), thermal shutdown and inrush current protection.
The switching frequency of the converter is tunable by an external resistor.
KEY FEATURES
• IEEE 802.03at Compatible
• High Efficiency
• High Integration
• Optional MPS Function
• Synchronous Gate Driver
• Low BOM Cost
• Transient Overvoltage Protection
• Thermal Shutdown Protection
• 5x5 mm 20-pin QFN
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