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UC3843 Status: ACTIVE

Current-Mode PWM Controller


      
         
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Datasheet

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 UC1843 UC2843 UC3843
TopologyBoost, Flyback, Forward  Boost, Flyback, Forward  Boost, Buck, Flyback, Forward  
Control MethodCurrent Mode  Current Mode  Current Mode  
Duty Cycle(Max)(%)100  100  100  
PWM Outputs(#)1  1  1  
Frequency(Max)(kHz)450  450  450  
UVLO Thresholds On/Off(V)8.4/7.6  8.4/7.6  8.4/7.6  
Pin/Package14CFP, 20LCCC, 8CDIP  14SOIC, 8PDIP, 8SOIC  14SOIC, 8PDIP, 8SOIC  
Regulated Outputs(#)1  1  1  
 SamplesSamplesSamples
 InventoryInventoryInventory

Other qualified versions of UC3843

Version Part Number Definition
Military UC1843 QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

  • UC3845: Current-Mode PWM Controller
  • UC3843A: Current Mode PWM Controller
  • UCC28061: Natural Interleaving(TM) Transition-Mode PFC Controller with Improved Audible Noise Immunity
  • LM4041C12: 1.2-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy

Product Information

Features

  • Optimized For Off-line and DC-to-DC Converters
  • Low Start-Up Current (<1 mA)
  • Automatic Feed ForwardCompensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Under-Voltage Lockout With Hysteresis
  • Double Pulse Suppression
  • High Current Totem Pole Output
  • Internally Trimmed Bandgap Reference
  • 500-kHz Operation
  • Low RO Error Amp

Description

The UC1842/3/4/5 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.

Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges.

View All Description in Datasheet

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC3843DACTIVE0 to 700.90 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3843D8ACTIVE0 to 700.90 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3843D8G4ACTIVE0 to 700.90 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3843D8TRACTIVE0 to 700.90 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3843D8TRG4ACTIVE0 to 700.90 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3843DG4ACTIVE0 to 700.90 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3843DTRACTIVE0 to 700.90 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3843DTRG4ACTIVE0 to 700.90 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3843NACTIVE0 to 700.90 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3843NG4ACTIVE0 to 700.90 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3843POBSOLETE0 to 70 PDIP (P) | 8 View    Download CAD Format for this FootprintNot Available
UC3843QTROBSOLETE0 to 70 PLCC (FN) | 20 View    Download CAD Format for this FootprintNot Available

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 9:52 AM GMT, 22 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksUC3843D
AmericasRochester Electronics >1k
AsiaWPI 61
WorldwideDigiKey 237
Mouser Electronics 127
TI Lead Time*: 20 WeeksUC3843D8
AmericasArrow >1k
WorldwideDigiKey >1k
TI Lead Time*: 20 WeeksUC3843D8G4
AmericasAvnet 300
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3843D8TR
AmericasRochester Electronics >1k
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3843D8TRG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3843DG4
WorldwideDigiKey  Available
Mouser Electronics 292
TI Lead Time*: 20 WeeksUC3843DTR
AmericasRochester Electronics >1k
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3843DTRG4
WorldwideDigiKey  Available
TI Lead Time*: 14 WeeksUC3843N
AmericasArrow 440
Avnet >1k
Newark 159
Rochester Electronics >1k
EuropeAbacus Polar >1k
Avnet-SILICA 650
WorldwideDigiKey 625
Mouser Electronics 19
TI Lead Time*: 14 WeeksUC3843NG4
EuropeEBV Elektronik 400
WorldwideDigiKey  Available
Mouser Electronics 50
View all Distributors  

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
UC3843D RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3843D8 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3843D8G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3843D8TR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3843D8TRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3843DG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3843DTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3843DTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3843N RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC3843NG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC3843P      View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for UC3843 Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

Selection Guides

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UC3845 Current-Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC3843A Current Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UCC28061 Natural Interleaving(TM) Transition-Mode PFC Controller with Improved Audible Noise Immunity AC/DC AND DC/DC POWER SUPPLIES-POWER FACTOR CORRECTION ICS TI customers also evaluated this product.
LM4041C12 1.2-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy VOLTAGE REFERENCE-SHUNT VOLTAGE REFERENCE TI customers also evaluated this product.

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