Silicon Laboratories UG332 User Manual
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Silicon Laboratories UG332 User Manual

Silicon Laboratories UG332 User Manual

Class 3 non-isolated evaluation board for the si3406
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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.
silabs.com | Building a more connected world.
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
Rev. 0.1

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Summary of Contents for Silicon Laboratories UG332

  • Page 1 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 KEY FEATURES (PoE) Powered Device (PD) application. • IEEE 802.03at Compatible •...

  • Page 2: Kit Description

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Kit Description 1. Kit Description The Si3406-non-isolated Flyback topology based evaluation board is a reference design for power supplies in Power over Ethernet (PoE) Powered Device (PD) applications. The Si3406 device is described more completely in the data sheet and application notes. This document describes the evaluation board.

  • Page 3: Getting Started: Powering Up The Si3406-Non-Iso-Fb Evb

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Getting Started: Powering Up the Si3406-non-ISO-FB EVB 2. Getting Started: Powering Up the Si3406-non-ISO-FB EVB Ethernet data and power are applied to the board through the RJ45 connector (J1). The board itself has no Ethernet data transmission functionality, but, as a convenience, the Ethernet transformer secondary-side data is brought out to test points.
  • Page 4 UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Getting Started: Powering Up the Si3406-non-ISO-FB EVB nt2p vpos vout vpos vout 0.01uF + C2 RJ-45 2.2uF 12uF 2.2uF 100uF FA2924 RS1B 1N4148W MX0+ TP3 NI TP4 NI gnds MX0- TP5 NI...

  • Page 5: Overall Evb Efficiency

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Overall EVB Efficiency 3. Overall EVB Efficiency The overall efficiency measurement data of the Si3406-non-ISO-FB EVB board is shown below. The input voltage is 50 V, output volt- age is 5 V.

  • Page 6: Sifos Poe Compatibility Test Results

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 SIFOS PoE Compatibility Test Results 4. SIFOS PoE Compatibility Test Results The Si3406-non-ISO-FB EVB board has been successfully tested with PDA-300 Powered Device Analyzer from SIFOS Technologies. The PDA-300 Powered Device Analyzer is a single-box comprehensive solution for testing IEEE 802.3at PoE Powered Devices (PDs).

  • Page 7: Feedback Loop Phase And Gain Measurement Results (Bode Plots)

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Feedback Loop Phase and Gain Measurement Results (Bode Plots) 5. Feedback Loop Phase and Gain Measurement Results (Bode Plots) The Si3406 device integrates a current mode controlled switching mode power supply controller circuit. Therefore, the application is a closed-loop system.

  • Page 8: Step Load Transient Measurement Results

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Step Load Transient Measurement Results 6. Step Load Transient Measurement Results The Si3406-non-ISO-FB EVB board's output has been tested with a step load function to verify the converters output dynamic re- sponse.

  • Page 9: Output Voltage Ripple

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Output Voltage Ripple 7. Output Voltage Ripple The Si3406-non-ISO-FB output voltage ripple has been measured in both no load and heavy load conditions. Figure 7.1. Si3406-Non-Isolated Flyback C3 EVB Output Voltage Ripple No Load (Left) and Heavy Load (Right) Conditions silabs.com | Building a more connected world.

  • Page 10: Soft Start Protection

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Soft Start Protection 8. Soft Start Protection The Si3406 device has an integrated dynamic soft-start protection mechanism to avoid stressing the components by the sudden current or voltage changes associated with the initial charging of the output capacitors.

  • Page 11: Output Short Protection

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Output Short Protection 9. Output Short Protection The Si3406 device has an integrated output short protection mechanism, which protects the IC itself and the surrounding external com- ponents from overheating in the case of electrical short on the output.

  • Page 12: Pulse Skipping At No-Load Condition

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Pulse Skipping at No-Load Condition 10. Pulse Skipping at No-Load Condition The Si3406 device has an integrated pulse skipping mechanism to ensure ultra-low power consumption at no load condition. Figure 10.1. Si3406 Pulse Skipping at No-load Condition: SWO Waveform silabs.com | Building a more connected world.

  • Page 13: Adjustable Evb Current Limit

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Adjustable EVB Current Limit 11. Adjustable EVB Current Limit For additional safety, the Si3406 has an adjustable EVB current limit feature. The EVB current limit through the ISNS pin measures the voltage on R .

  • Page 14: Tunable Switching Frequency

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Tunable Switching Frequency 12. Tunable Switching Frequency The switching frequency of the oscillator is selected by choosing an external resistor (R ) connected between the RFREQ and FREQ VPOS pins. The following figure will aid in choosing the R value to achieve the desired switching frequency.

  • Page 15: Synchronous Rectification

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Synchronous Rectification 13. Synchronous Rectification The Si3406 device has synchronous gate driver (SYNCL) to drive the rectifier MOSFET. At low-load the converter works in discontinu- ous current mode (DCM); at heavy load, the converter runs in continuous current mode (CCM). At low-load the SWO voltage waveform has a ringing waveform, which is typical for a DCM operation.

  • Page 16: Maintain Power Signature

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Maintain Power Signature 14. Maintain Power Signature The Si3406 device integrates an MPS circuit which ensures connection with the PSE if the PD application current drops below PSE threshold level. There are two modes of MPS operation: •...

  • Page 17: Radiated Emissions Measurement Results

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Radiated Emissions Measurement Results 15. Radiated Emissions Measurement Results Radiated emissions have been measured of the Si3406-non-ISO-FB EVB board with 50 V input voltage and full load connected to the output – 12.5 W.

  • Page 18: Conducted Emissions Measurement Results

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Conducted Emissions Measurement Results 16. Conducted Emissions Measurement Results The Si3406-non-ISO-FB EVB board's conducted emissions have been measured, the result is shown below. Figure 16.1. Si3406-Non-Isolated Flyback EVB Conducted Emissions Measurements Results; 50 V Input, 5 V Output, 12.5 W Output Load silabs.com | Building a more connected world.

  • Page 19: Board Layout

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Board Layout 17. Board Layout Figure 17.1. Top Silkscreen Figure 17.2. Top Layer silabs.com | Building a more connected world. Rev. 0.1 | 19...
  • Page 20 UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Board Layout Figure 17.3. Internal 1 (Layer 2) Figure 17.4. Internal 2 (Layer 3) silabs.com | Building a more connected world. Rev. 0.1 | 20...
  • Page 21 UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Board Layout Figure 17.5. Bottom Layer silabs.com | Building a more connected world. Rev. 0.1 | 21...

  • Page 22: Bill Of Materials

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Bill of Materials 18. Bill of Materials The following table is the BOM listing for the standard 5 V output evaluation board with option PoE Class 3. Table 18.1. Si3406FBC3 Evaluation Board Bill of Materials...
  • Page 23 UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Bill of Materials Value Refer- Rating Voltage Type PCB Footprint ence Part Number BND_P 15 A BANANA BANANA-JACK ABBATRON HH SMITH 15 A BANANA BANANA-JACK ABBATRON HH SMITH 330 Ω 1500...
  • Page 24 UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Bill of Materials 330 pF 100 V ±20% C0805 C0805X7R101-331M Venkel 1N4148 300 mA 100 V Single SOD-123 1N4148W-7-F Diodes Inc. silabs.com | Building a more connected world. Rev. 0.1 | 24...

  • Page 25: Appendix-Si3406-Non-Iso-Fb Design And Layout Checklist

    UG332: Class 3 Non-Isolated Evaluation Board for the Si3406 Appendix—Si3406-Non-ISO-FB Design and Layout Checklist 19. Appendix—Si3406-Non-ISO-FB Design and Layout Checklist Although the EVB design is pre-configured as a Class 3 PD with 5 V output, the schematics and layouts can easily be adapted to meet a wide variety of common output voltages and power levels.
  • Page 26 Trademark Information Silicon Laboratories Inc.® , Silicon Laboratories®, Silicon Labs®, SiLabs® and the Silicon Labs logo®, Bluegiga®, Bluegiga Logo®, Clockbuilder®, CMEMS®, DSPLL®, EFM®, EFM32®, EFR, Ember®, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZRadio®, EZRadioPRO®, Gecko®, ISOmodem®, Micrium, Precision32®, ProSLIC®, Simplicity Studio®, SiPHY®, Telegesis, the Telegesis Logo®, USBXpress®, Zentri and others are trademarks or registered...

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