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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

UG332: Class 3 Non-Isolated Evaluation Board for the Si3406

Pulse Skipping at No-Load Condition

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Summary of Contents for UG332

Page 1: ...06 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 ci...

Page 2: ...Si3404 PoE PD Controller in Isolated and Non Isolated Designs for more information The preconfigured Class 3 signature can also be modified which is described as well in AN1130 The Si3406 includes int...

Page 3: ...ing an IEEE 802 3 2015 compliant PoE capable PSE such as Trendnet TPE 1020WS Using a laboratory power supply unit PSU Connecting a dc source between blue white blue and brown white brown of the Ethern...

Page 4: ...cl NI U1 Si3406 FBH 1 EROUT 2 FBL 3 VDD 4 NSLEEP 5 RDET 6 HSO 7 RCL 8 RFREQ 9 SP2 10 SP1 11 VPOS 12 CT2 13 CT1 14 NT2P 15 SYNCL 16 V11 17 SWO 18 VSS 19 ISNS 20 VNEG 21 L1 330 Ohm R2 330 R11 24 3k C19...

Page 5: ...is 5 V Figure 3 1 Si3406 Non Isolated Flyback Class 3 EVB Overall Efficiency 50 V Input 5 V Output Class 3 PD Note The chart shows overall EVB efficiency The voltage drop on the standard silicon diod...

Page 6: ...es The PDA 300 Powered Device Analyzer is a single box comprehensive solution for testing IEEE 802 3at PoE Powered Devices PDs Figure 4 1 Si3406 Non Isolated Flyback C3 PD SIFOS PoE Compatibility Test...

Page 7: ...he feedback loop should be stable To verify the stability of the loop the loop gain and loop phase shift has been measured 180 90 0 90 180 80 60 40 20 0 20 40 60 80 100 1 000 10 000 100 000 Figure 5 1...

Page 8: ...h a step load function to verify the converters output dynamic re sponse Figure 6 1 Si3406 Non Isolated Flyback EVB PD Output Step Load Transient Test UG332 Class 3 Non Isolated Evaluation Board for t...

Page 9: ...n 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 UG332 Class 3 Non Isolated Evaluation Board fo...

Page 10: ...or voltage changes associated with the initial charging of the output capacitors Figure 8 1 Si3406 Non Isolated Flyback C3 EVB Input Current and Output Voltage Soft Start at Low Load Left and Heavy L...

Page 11: ...urrounding external com ponents from overheating in the case of electrical short on the output Figure 9 1 Si3406 Non Isolated Flyback C3 EVB Output Voltage and Input Current when Output is Shorted UG3...

Page 12: ...g mechanism to ensure ultra low power consumption at no load condition Figure 10 1 Si3406 Pulse Skipping at No load Condition SWO Waveform UG332 Class 3 Non Isolated Evaluation Board for the Si3406 Pu...

Page 13: ...mV referenced to Vss the current limit circuit restarts the circuit to protect the application The EVB current limit for this Class 3 application can be calculated with the following formula RSENSE 0...

Page 14: ...will aid in choosing the RFREQ value to achieve the desired switching frequency Figure 12 1 Switching Frequency vs RFREQ The selected switching frequency for this application is 220 kHz which is achi...

Page 15: ...operation Figure 13 1 SWO and SYNCL Voltage Waveforms at Discontinuous Current Mode DCM Left and in Continuous Current Mode CCM Right The device operates in non synchronous mode at light load IIN 25 m...

Page 16: ...rent consumption not to degrade overall board efficiency nSLEEP low IIN Figure 14 1 Automatic MPS Mode nSLEEP is Low MPS is Enabled when PD Consumption is Low MPS is Disabled when PD Consumption is Hi...

Page 17: ...tal polarizations This is a relatively fast process that produces a red curve vertical polarization and a blue curve horizontal polarization Next specific frequencies are selected red stars for quasi...

Page 18: ...sured 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 UG332 Class 3 Non Isolated Evaluation Boar...

Page 19: ...17 Board Layout Figure 17 1 Top Silkscreen Figure 17 2 Top Layer UG332 Class 3 Non Isolated Evaluation Board for the Si3406 Board Layout silabs com Building a more connected world Rev 0 1 19...

Page 20: ...Figure 17 3 Internal 1 Layer 2 Figure 17 4 Internal 2 Layer 3 UG332 Class 3 Non Isolated Evaluation Board for the Si3406 Board Layout silabs com Building a more connected world Rev 0 1 20...

Page 21: ...Figure 17 5 Bottom Layer UG332 Class 3 Non Isolated Evaluation Board for the Si3406 Board Layout silabs com Building a more connected world Rev 0 1 21...

Page 22: ...603X5R6R3 105K Venkel C13 100 V 10 X7R C0603 C0603X7R101 102K Venkel C14 100 V 10 X7R C0603 C0603X7R101 102K Venkel C15 100 V 10 X7R C0603 C0603X7R101 102K Venkel C16 100 V 10 X7R C0603 C0603X7R101 10...

Page 23: ...8 R5 1 8 W 1 Thick Film R0805 RC0805FR 076R8L Yageo 1 88 7 k R8 1 8 W 1 Thick Film R0805 CRCW080588K7FKEA Vishay 1 48 7 R10 1 8 W 1 Thick Film R0805 CRCW080548R7FKTA vishay 1 24 3 k R11 1 8 W 1 Thick...

Page 24: ...C0805 C0805X7R101 331M Venkel 1 1N4148 W D5 300 mA 100 V Single SOD 123 1N4148W 7 F Diodes Inc UG332 Class 3 Non Isolated Evaluation Board for the Si3406 Bill of Materials silabs com Building a more c...

Page 25: ...If your design uses an AUX supply be sure to include a 3 surge limiting resistor in series with the AUX supply for hot inser tion Refer to AN1130 when AUX supply is 48 V 3 Layout Guidelines a Make su...

Page 26: ...any integrated circuits The products are not designed or authorized to be used within any Life Support System without the specific written consent of Silicon Labs A Life Support System is any product...

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