[PDF] LM5021-Q1 AC-DC Current-Mode PWM Controller datasheet

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VOUT VIN CS SS OUT

FEEDBACK

WITH

ISOLATION

COMP GNDRT

VCC

LM502190 ~ 264 Vac

AC

Product

Folder

Sample &

BuyTechnical

Documents

Tools &

Software

Support &

Community

LM5021-Q1

LM5021-Q1

VIN VCC

OUTRTCSGNDSS

COMP 1 2 3 4 8 7 6 5

LM5021-Q1

5GND - Groundreturn.Currentsenseinputforcurrentmodecontrolandover-currentprotection.Currentlimitingisaccomplishedusingadedicatedcurrentsensecomparator.IftheCScomparator6CSICurrentSenseinput.inputexceeds0.5VtheOUTpinswitcheslowforcycle-by-cyclecurrentlimit.CSisheldlowfor90nsafterOUTswitcheshightoblanktheleadingedgecurrentspike.AnexternalresistorconnectedfromRTtoGNDsetstheOscillatortimingresistorpinand7RT/SYNCOoscillatorfrequency.Thispinwillalsoacceptsynchronizationinput.synchronizationpulsesfromanexternalclock.Anexternalcapacitorandaninternal22µAcurrentsource8SSOSoft-start/Hiccuptimesetthesoft-startramp.Thesoft-startcapacitorcontrolsboththesoft-startrateandthehiccupmodeperiod.Copyright©2014,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3

ProductFolderLinks:LM5021-Q1

LM5021-Q1

VINtoGND-0.330V

VINClampContinuousCurrent5mA

CStoGND-0.31.25V

RTtoGND-0.35.5V

AllotherpinstoGND-0.37.0V

OperatingJunctionTemperature150

6.2ESDRatingsVALUEUNIT

VINVoltage(1)830V

THERMALMETRIC(1)DGKUNIT

8PINSR

R R

LM5021-Q1

STARTUPCIRCUITI

VIN_ENVCCRegulatorenablethreshold172023V

V

VIN_DISVCCRegulatordisablethreshold7.25V

V

VIN_CMPVINESDclampvoltageI=5mA303640V

I

VCCSUPPLYV

VCC_ENControllerenablethreshold6.577.5V

V V V I

SKIPCYCLEMODECOMPARATORV

V

SKP_HYSSkipcyclemodehysteresis5mV

load=0V

CS_MAXCSlimitthreshold0.450.50.55V

t

LEBLeadingedgeblankingtime90ns

R

CS_BNKCSblankingsinkingimpedance3555

SOFT-START

V

SS_OCVSSpinopen-circuitvoltage4.35.26.1V

I

SSSoft-startcurrentsource152230µAV

R

COMPCOMPsinkingimpedanceDuringSSramp60

OSCILLATOR

F

OSCFrequency1(RT=44.2K)135150165kHz

F

OSCFrequency2(RT=13.3K)440500560kHz

V

SYNCSyncthreshold2.43.23.8V

PWMCOMPARATORCOMPsetto2VCSstepped0to0.4t

PWM_DLYCOMPtoOUTdelayV,timetoOUT20ns

transitionlow,C load=0D

MINMindutycycleCOMP=0V0%

D

MAXMaxdutycycle(-1Device)75%80%85%

D

MAXMaxdutycycle(-2Device)50%

K

PWMCOMPtoPWMcomparatorgain0.33

V

COMP_OCCOMPopencircuitvoltage4.25.16V

V

COMP_MAXDCOMPatmaxdutycycle2.75V

I

ProductFolderLinks:LM5021-Q1

LM5021-Q1

OUT=50mA,V

OUTHOUThighsaturation0.61.1VVCC-OUTV

OUTLOUTlowsaturationI

OUT=100mA0.31V

I

O_SRCPeaksourcecurrentOUT=VCC/20.3A

I

O_SNKPeaksinkcurrentOUT=VCC/20.7A

t rRisetimeC load=1nF25ns t fFalltimeC load=1nF10ns

HICCUPMODEV

OVLDOverloaddetectionthresholdCOMPpinV

SS-OCV-0.8V

SS-OCV-0.6V

SS-OCV-0.4V

V

HICHiccupmodethresholdSSpinV

SS-OCV-0.8V

SS-OCV-0.6V

SS-OCV-0.4V

V I

OVCS61014µAsource

1 10 100 1000

SOFTSTART CAPACITANCE (nF)0.010.1110100

OFF TIME (s)

TEMPERATURE (oC)

OUT PEAK CURRENT (A)

-40 0 40 80 1200.20.30.40.50.60.70.80.9

Sinking

Sourcing

0 5 10 15 20 250510152025

VCC (V)

VIN (V)

0 500 1000 1500 2000

OUT DRIVER LOAD (pF)

VIN CURRENT (mA)

23456

FS = 160 kHz

FS = 80 kHz

FS = 40 kHz

1516 171819 20 21

V

IN VOLTAGE (V)0246810121416

VIN CURRENT (PA)

VIN Falling

VIN Rising

0

10 20 30

V

IN (V)

VIN CURRENT (mA)

0123

LM5021-Q1

ProductFolderLinks:LM5021-Q1

RT (kQ)

OUT SWITCHING FREQUENCY (kHz)

1 10 100 1000101001000

LM5021-1

LM5021-2

LM5021-Q1

LM5021-Q1

ProductFolderLinks:LM5021-Q1

CSSSVIN

GND

VCC8.5V LINEAR

REGULATOR

OSC

OUTSLOPE COMPENSATION RAMP GENERATOR

DRIVER

PWM

COMPARATOR

5.2V CLK 22 PA

10 PA0.25 PA

COMP

SKIP CYCLE

COMPARATOR

MAX DUTY LIMIT

LM5021 - 1 (80%)

LM5021 - 2 (50%)(LM5021 - 1 ONLY)

1.8k 5k 2R R

125 mV

CURRENT LIMIT

COMPARATOR

36V
CLAMP

RT/ SYNC

50 PA
0 PA

VIN UVLO

20V RISING

7.25V FALLING

EN

VCC_UVLO

QS R PWM LOGIC SS 5.2V 1.25V

550 mV

VCC_UVLOVCC_UVLO

DIS

SOFTSTART

AND

HICCUP

MODE LOGIC COMP

VCC_UVLO

VCC UVLO

7V RISING

5.8V FALLING

1

500 mV

CLK

Leading Edge Blanking

7 23
4 8 5 6

LM5021-Q1

RT =6.63 x 109

2 x F

SWRT =6.63 x 109

F SW

LM5021-Q1

(1)

LM5021-2:

(2)

ProductFolderLinks:LM5021-Q1

Toff =C

SS x (VHC ? VRST)

I

DTCS= C

SS x (4.6V ? 0.3V)

0.25 ?A

LM5021-Q1

SS

OUT5.2V

QS

550 mV

0.25 PAEN

DRIVERPWM

22 PAEN

5.2V

RESTART

COMPARATOR-+

0.3V

10 PAEN

4.6VOVERLOAD

DETECTION-+

R

HICCUP MODE

COMPARATOR+

4.6V COMP

Toverload =C

SS x (VSS_OCV ? VHC)

I

OVCS= C

SS x 0.6V

10 ?A

LM5021-Q1

Example:

ProductFolderLinks:LM5021-Q1

SSCOMP+22 PA

5.2V 4.6V -10 PA during over load+22 PA after releasing the over loadSSCOMP

Soft-StartNormal

operationOverload

DetectionSMPS latched

OFFSoft-Start

+22 PA-10 PA
-0.25 PA +22 PA
5.2V 4.6V 0.3V

LM5021-Q1

LM5021

VIN CS OUT

Voffset > 125 mV

RSense

VCC PWM

LOGICPWM

COMPARATOR

5.2V COMP

SKIP CYCLE

COMPARATOR

1.25V5k

2R R

125 mV

1.8k CLK

500 mV

CURRENT LIMIT

COMPARATOR

CS

LEADING EDGE

BLANKING

LM5021-Q1

ProductFolderLinks:LM5021-Q1

LM5021-Q1

UPPER LOWER

INTERNAL

BIAS

GENERATORV

CC UVLO S RQ +HV VIN V CC

REGULATOR

VCCRstart

C VIN VIN

UVLOCVCC

Enable Driver

TRANSFORMER

BIAS

WINDING

LM5021-Q1

ProductFolderLinks:LM5021-Q1

TVIN_THRESHOLD = RSTART x CVIN x ln1 -HV20V

-1

Tmax =C

VIN x (19.15V ? 8.5V)

6.25 mA= 17 ms8.5V xCVCCVIN = 20V -CVIN

LM5021-Q1

NOTES:

1)

85Vac-130Vac Input

24V/1.45A 2%

GND1

Do not populate

4kV Isolation barier

180Vac for 35ms

Isat > 2.4A

1

Program

R19 for development purpose only

Program pin 0V -> Vout=24V

Program pin open -> Vout=8V

TP8 -> 8V1

1

Fsw = 145kHz

TP1 R12 22k
TP6 J2 R19 49.9
L2 1uH R8 2 R16 4.7 C8 100n
Q4

STP11NK40ZFP

TP11 TP10 D4

20CTQ150

R6 100
C13 22u
50V
D9

BZX585?C15

Q3

MMBT2222A

1HS1 TP7 TP4 TP2 C9 6.8u R24 43.2k
R26 4.7k R32

221kC24

1n C23 100p
C3 470n

L110?H

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