LM5021   
AC-DC Current Mode PWM Controller 		Click link to Download

Features
•Ultra Low Start-up Current (25 µA maximum)
•Current Mode Control
•Skip Cycle Mode for Low Standby Power
•Single Resistor Programmable Oscillator
•Synchronizable Oscillator
•Adjustable Soft-start
•Integrated 0.7A Peak Gate Driver
•Direct Opto-Coupler Interface
•Maximum Duty Cycle Limiting (80% for LM5021-1 or 50% for LM5021-2)
•Slope Compensation for (LM5021-1 Only)
•Under Voltage Lockout (UVLO) with Hysteresis
•Cycle-by-Cycle Over-Current Protection
•Hiccup Mode for Continuous Overload Protection
•Leading Edge Blanking of Current Sense Signal
• Packages: MSOP-8 or MDIP-8

Description

The LM5021 off-line pulse width modulation (PWM) controller contains all of the features needed to implement highly efficient off-line single-ended flyback and forward power converters using current-mode control. The LM5021 features include an ultra-low (25 µA) start-up current, which minimizes power losses in the high voltage start-up network. A skip cycle mode reduces power consumption with light loads for energy conserving applications (ENERGY STAR®, CECP, etc.). Additional features include under-voltage lockout, cycle-by-cycle current limit, hiccup mode overload protection, slope compensation, soft-start and oscillator synchronization capability. This high performance 8-pin IC has total propagation delays less than 100nS and a 1MHz capable oscillator that is programmed with a single resistor.
Also Recommended
LM5020▲Integrated 100V Start-Up Regulator
LM3411Feedback Control / Optocoupler Driver For Isolated Supplies
LMV431Voltage Reference / Feedback Control For Isolated Supplies



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Typical Application
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Block Diagram
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Typical Performance
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Paramaters / ValuesLM5021 LM5020
Input Min Voltage8 Volt 13 Volt
Input Max Voltage30 Volt 100 Volt
Adjustable OutputYes Yes
Input Max Voltage30 Volt 100 Volt
Frequency Max1000 kHz 1000 kHz
Output Rangeset by external feedback network
Adj Switch FrequencyYes Yes
Frequency Min50 kHz 50 kHz
Frequency Max1000 kHz 1000 kHz
Adj Switch FrequencyYes Yes
Sync PinYes Yes
On/Off PinYes Yes
Error FlagNo No
Special FeaturesFor offline (AC-DC) applications, direct opto-coupler interface 80% and 50% duty cycle limit (-2 and -1 versions), Programmable UVLO, error amplifier for non-isolated designs, leading-edge blanking, high current gate drive
TopologyFlyback, Forward Flyback, Inverting, Buck, Boost, Forward
Output Rangeset by external feedback network
Special FeaturesFor offline (AC-DC) applications, direct opto-coupler interface 80% and 50% duty cycle limit (-2 and -1 versions), Programmable UVLO, error amplifier for non-isolated designs, leading-edge blanking, high current gate drive
Temperature Min-40 deg C -40 deg C
Temperature Max125 deg C 125 deg C
Step-DownYes Yes
Step-UpYes Yes
FlybackYes Yes
InvertingYes Yes
RegTypeSwitching Controller Switching Controller
Adjustable OutputYes Yes
Switching Frequency500 kHz
Multiple Output CapabilityYes Yes
Step-DownYes Yes
Step-UpYes Yes
InvertingYes Yes
FlybackYes Yes
RegTypeSwitching Controller Switching Controller
Multiple Output CapabilityYes Yes
Temperature Min-40 deg C -40 deg C
Temperature Max125 deg C 125 deg C

Datasheet
TitleSizeDateOther
Language
LM5021 AC-DC Current Mode PWM Controller747
Kbytes		29-Jun-05日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-1314: Application Note 1314 LM5020 Evaluation Board612
Kbytes		10-Feb-05 
AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge230
Kbytes		2-Jul-08 
AN-1574: Application Note 1574 LM5073 Evaluation Board464
Kbytes		24-Apr-07 


More Application Notes
TitleSizeDateOther
Language
AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge230
Kbytes		2-Jul-08 
AN-1976: Application Note 1976 LM5027 Evaluation Board588
Kbytes		19-Aug-09 
AN-1574: Application Note 1574 LM5073 Evaluation Board464
Kbytes		24-Apr-07 
AN-1387: Application Note 1387 LM5026 Evaluation Board721
Kbytes		7-Sep-05 中文
AN-1696: Application Note 1696 Designing a Boost LED Driver Using the LM5022286
Kbytes		22-Feb-08 中文
AN-1314: Application Note 1314 LM5020 Evaluation Board612
Kbytes		10-Feb-05 
AN-1605: Application Note 1605 LM5022 Boost LED Driver Evaluation Board769
Kbytes		2-Oct-07 
AN-1557: Application Note 1557 LM5022 Evaluation Board513
Kbytes		22-May-08 中文

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM5021MM-1/NOPB

RoHS



MINI SOIC		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide16000
DIGIKEYWorldwide2188
FARNELLEurope and Asia1280
FUTUREWorldwide1100
NEWARKAmericas905
RS COMPONENTSWorldwide620
TECHMOSAAsia Pacific6000
$0.69 each at 1K+ pcsreel
of
1000
LM5021MM-2/NOPB

RoHS



MINI SOIC		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide8000
DIGIKEYWorldwide2122
FARNELLEurope and Asia918
RS COMPONENTSWorldwide5
$0.64 each at 1K+ pcsreel
of
1000
LM5021MMX-1/NOPB

RoHS



MINI SOIC		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.69 each at 1K+ pcsreel
of
3500
LM5021MMX-2/NOPB

RoHS



MINI SOIC		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.64 each at 1K+ pcsreel
of
3500
LM5021NA-2/NOPB

RoHS



MDIP		Lifetime buy
Lead Time: 6 weeks

 
DistributorRegionQty
AVNET-EMWorldwide1
DIGIKEYWorldwide0
FARNELLEurope and Asia497
RS COMPONENTSWorldwide10
$0.64 each at 1K+ pcsrail
of
40
LM5021NA-1/NOPB

RoHS



MDIP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide383
FARNELLEurope and Asia488
$0.69 each at 1K+ pcsrail
of
40

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM5021NA-2
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM5021MM-1/NOPB
MINI SOIC81260RoHSDownloadN/A
ZXTT
21-1
LM5021MM-2/NOPB
MINI SOIC81260RoHSDownloadN/A
ZXTT
21-2
LM5021MMX-1/NOPB
MINI SOIC81260RoHSDownloadN/A
ZXTT
21-1
LM5021MMX-2/NOPB
MINI SOIC81260RoHSDownloadN/A
ZXTT
21-2
LM5021NA-2/NOPB
MDIP81NARoHSDownloadN/A
NSUZXYTT
LM5021NA
-2
LM5021NA-1/NOPB
MDIP81NARoHSDownloadN/A
NSUZXYTTE#
LM5021NA
-1

Design Tools


Reference Design
RD-166 - Load Detecting Power Supply

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM5021MM-1ABCD15003417500423400011201409060
LM5021MM-2ABCD15003417500423400011201409060
LM5021MMX-1ABCD15003417500423400011201409060
LM5021MMX-2ABCD15003417500423400011201409060
LM5021NA-1ABCD15003417500423400011201409060
LM5021NA-2ABCD15003417500423400011201409060

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM5021NA-2
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009

[Information as of 21-Nov-2009]