FT831B 5W demo board doc更改后.docx

FT831B 5W demo board doc更改后.docx

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FT831B5Wdemoboarddoc更改后

5WLEDLumpModuleDesignwithFT831B

（PreliminaryRelease）

Index

1INTRODUCTION.......................................................................................................3

2MODULESPECIFICATION.......................................................................................3

2.1InputCharacteristics............................................................................................................3

2.2OutputCharacteristics.........................................................................................................3

2.3PerformanceSpecification..................................................................................................3

2.4ProtectionFeatures..............................................................................................................4

2.5Environmental.......................................................................................................................4

2.6DielectricWithstand（Hi-pot）Test......................................................................................4

2.7Insulation...............................................................................................................................4

3MODULEINFORMATION.........................................................................................5

3.1Schematic..............................................................................................................................5

3.2PCBGerber............................................................................................................................6

3.3BillofMaterials.....................................................................................................................7

3.4TransformerDesign.............................................................................................................8

1）TransformerSpecification...............................................................................................8

2）Electricaldiagram.............................................................................................................8

3）TransformerBuildDiagram.............................................................................................8

3.5ModuleSnapshot..................................................................................................................9

4PERFORMANCEEVALUATION............................................................................10

4.1InputCharacteristics..........................................................................................................11

1）InputNormalCharacteristics........................................................................................11

2）StandbyPower................................................................................................................11

4.2OutputCharacteristics.......................................................................................................11

1）PrecisionofOutputCurrent..........................................................................................11

2）Ripple................................................................................................................................11

3）TimeSequence................................................................................................................12

4.3Protection............................................................................................................................13

1）OpenCircuitProtection.................................................................................................13

2）ShortCircuitProtection.................................................................................................13

4.4EMITest...............................................................................................................................13

5SYSTEMOTHERIMPORTANTWAVEFORM........................................................15

5.1MOSFETVDSWaveformat264Vac,startup/shutdown.............................................15

5.2OutputRectifierDiodeVAKWaveformatFullLoad.....................................................15

1INTRODUCTION

ThisdocumentpresentsperformancecharacteristicsofanisolatedflybackconvertermoduledesignedwithFT831B.Themodulefeatures:

¾highprecisionforoutputcurrentinuniveralinputvoltage.

¾Simplecircuit.

Thisdocumentcontainssessionsonpowersupplyspecification,schematic/PCBGerber/BOM,transformerdesignandperformancedata.

2MODULESPECIFICATION

2.1InputCharacteristics

ACInputVoltageRating

100Vacto240Vac

ACInputVoltageRange

90Vacto264Vac

ACInputFrequency

47Hzto63Hz

Table1

2.2OutputCharacteristics

OutputVoltage

+16.4V

OutputCurrent

350mA

PrecisionofOutputCurrent

3%

RippleofOutputVoltage

2.3V

RippleofOutputCurrent

322mA

Table2

Note:

RippleofOutputVoltageismeasuredwith20MHzbandwidthlimited（peaktopeakvalue）attheendofa12-inchtwistedwireterminatedwitha10uFcapacitorinparallelwitha0.1uFceramiccapacitor.

2.3PerformanceSpecification

TotalOutputPower

5.6WTypical

StandbyPower

<0.3W@90Vac/63Hz~265Vac/47Hz,noload

Efficiency

77%min.@264Vac/50Hzwithfullload

TurnonDelayTime

≤1.1sec.max.@90Vac/50Hzwithfullload

SwitchingFrequency

45KHz±3%

Table3

2.4ProtectionFeatures

ShortCircuitProtection

Outputshutdown（AutoRecovery）

OpenCircuitProtection

OutputVoltageriseto19V

Table4

2.5Environmental

OperatingTemperature

-10℃to+40℃

OperatingHumidity

20%to90%R.H.

StorageTemperature

-40℃to85℃

StorageHumidity

0%to+90%R.H.

Table5

2.6DielectricWithstand（Hi-pot）Test

InputtoOutput3000Vac1min.

Table6

2.7Insulation

InputtoOutputDC500V10Mohmmin

Table7

3MODULEINFORMATION

3.1Schematic

Figure1:

Schematic

3.2PCBGerber

Figure2:

TopView

Figure3:

Bottomview

3.3BillofMaterials

RefDes

Description

Package

PartNum

QTY

U1

IC

SOT23-6

FT831B

1

F1

0.5A250Vac,Fuse

3.6×10mm

1

B1

0.5A600V,Bridge

SOIC-4

DB6S

1

L1

2.2mH,Inductor

4×10mm

1

Q1

1.5A700V,NPN

TO-126

13003

1

T

Transformer

EE16

1

C1，C2

4.7uF400V,Electrolytic

8×12.5mm

2

C3

470Pf250V,5%,Ceramic,X7R

0805

1

C4

100pF25V,1%,Ceramic,X7R

0805

1

C5，C6

10uF25V,5%,Ceramic,X7R

1206

2

D1

1A1000V,FastRecoveryRectifier

DO-214AC

RS1M

1

D2

1A100V,FastRecoveryRectifier

DO-219AB

RS1001FL

1

D3

2A400V,SuperFastRecoveryRectifier

DO-214AA

SS2G

1

R1,R2

560k,1/8W,5%,MetalFilm

0805

2

R3

100k,1/4W,5%,MetalFilm

1206

1

R4

27k,1/8W,5%,MetalFilm

0805

1

R5

15k,1/8W,5%,MetalFilm

0805

1

R6

3R9,1/8W,1%,MetalFilm

0805

1

R7

2,1/8W,1%,MetalFilm

0805

1

R8

0,1/8W,5%,MetalFilm

0805

1

R9

6k8,1/8W,5%,MetalFilm

0805

1

R10

200k,1/8W,5%,MetalFilm

0805

1

R11

10,1/8W,5%,MetalFilm

0805

1

Table8

3.4TransformerDesign

1）TransformerSpecification

1）Bobbin:

EE16Horizontal（10Pin）

2）CoreMaterial:

PC40（TDG）.

3）L（3-1）=1700uH+/-200uH（1KHz,0.25V,25℃）

4）HI-POT:

（60Hz/5mA/3SecT）.Pri.toSec.3000Vac.

2）Electricaldiagram

Figure4:

ElectricalDiagram

3）TransformerBuildDiagram

Figure5:

TransformerBuildDiagram

3.5ModuleSnapshot

Figure6:

TopView

Figure7:

bottomView

4PERFORMANCEEVALUATION

Thissessionpresentsthetestresultsof5Wmoduleuptodate.Resultsoninrushcurrent,leakagecurrentandESDarenotincludedandwillbeaddedwhentheybecomeavailable.

Overall,themodulemeetsdesignspecifications.

PerformanceHighlights:

Theefficiencyover90Vac~264Vacis≥77%

Thestandbypoweris<0.3Wat264Vac/50Hzwithnoload

CharacterizationResultsSummary

Test

Specification

Test

1.InputCharacteristics

InputVoltage

90~264V

90~264V

InputCurrent

<0.134A

Standbypower

<0.3W

0.28W

Efficiency（Average）

>73%

79％

2.OutputCharacteristics

OutputVoltageRange

15~19V

OutputCurrentRange

330~370mA

OutputVoltageRipple

2.32V

OutputVoltageRipple

0.322A

3.TimeSequence

Turnondelaytime

<3.0S

1.1S

Holduptime

6.8ms

4.Protection

OpenCircuitprotection

Pass

ShortCircuitprotection

Pass

Table9

4.1InputCharacteristics

1）InputNormalCharacteristics

Themodulewastestedatdifferentinputvoltages（from90Vacto264Vac）anddifferentloadconditions（fullloadandnoload）.Efficiencyandstandbypowerweremeasuredandlistedintable10andtable11.

InputVoltage

Irms（A）

Pin（W）

Vo（V）

Io（A）

η

Specification

TestResult

90V/50Hz

0.134

7.61

16.35

0.361

77.56%

>73%

Pass

115V/50Hz

0.110

7.58

16.46

0.367

79.69%

230V/50Hz

0.073

7.55

16.35

0.372

80.56%

264V/50Hz

0.068

7.64

16.47

0.370

79.76%

Table10:

Inputcharacteristicsatfullload

2）StandbyPower

InputVoltage

Vo（V）

InputPower（W）

Specification

TestResult

90V/50Hz

18.46

0.09

<0.3W

Pass

115V/50Hz

18.54

0.09

230V/50Hz

18.79

0.21

264V/50Hz

18.76

0.28

Table11:

Standbypoweratnoload

4.2OutputCharacteristics

1）PrecisionofOutputCurrent

InputVoltage

90V

115V

230V

264V

Precision

Current

0.361A

0.367A

0.372A

0.370A

±1.5%

Table12:

PrecisionofOutputCurrent

2）Ripple

InputVoltage

90V

115V

230V

264V

RippleofOutputVoltage

2.30V

2.14V

2.16V

2.32V

Table13:

RippleofOutputVoltage

InputVoltage

90V

115V

230V

264V

RippleofOutputCurrent

0.322A

0.300A

0.300A

0.30