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UC3842 Status: ACTIVE

Current-Mode PWM Controller


      
         
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Datasheet

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 UC1842 UC2842 UC3842
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)16/10  16/10  16/10  
Pin/Package14CFP, 20LCCC, 8CDIP  14SOIC, 8PDIP, 8SOIC  14SOIC, 8PDIP, 8SOIC  
Regulated Outputs(#)1  1  1  
 SamplesSamplesSamples
 InventoryInventoryInventory

Other qualified versions of UC3842

Version Part Number Definition
Catalog UC3842M TI's standard catalog product
Military UC1842 QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

  • TL494: PWM Control Circuit
  • TL431: Adjustable Precision Shunt Regulator
  • TPS5430: 5.5V to 36V, 3A, 500kHz Step Down SWIFT™ Converter

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
UC3842DACTIVE0 to 700.85 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3842D8ACTIVE0 to 700.85 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3842D8G4ACTIVE0 to 700.85 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3842D8TRACTIVE0 to 700.90 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3842D8TRG4ACTIVE0 to 700.90 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3842DG4ACTIVE0 to 700.85 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3842DTRACTIVE0 to 700.90 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3842DTRG4ACTIVE0 to 700.90 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3842NACTIVE0 to 700.85 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3842NG4ACTIVE0 to 700.85 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3842POBSOLETE0 to 70 PDIP (P) | 8 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 9:53 AM GMT, 24 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksUC3842D
AmericasNewark 292
Rochester Electronics >1k
AsiaFarnell Asia 19
WPI 45
EuropeArrow Southern Europe 350
Farnell 19
WorldwideDigiKey 108
Mouser Electronics 69
TI Lead Time*: 20 WeeksUC3842D8
AmericasAvnet 725
Newark 80
Rochester Electronics >1k
AsiaWPI 107
EuropeAvnet-SILICA 225
WorldwideDigiKey 132
Mouser Electronics 228
TI Lead Time*: 20 WeeksUC3842D8G4
EuropeEBV Elektronik 8
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3842D8TR
AmericasRochester Electronics >1k
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3842D8TRG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3842DG4
AmericasAvnet >1k
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3842DTR
AmericasRochester Electronics >1k
EuropeAvnet-SILICA >1k
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3842DTRG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3842N
AmericasNewark 329
Rochester Electronics >1k
AsiaWPI 48
EuropeAvnet-SILICA >1k
Spoerle 500
WorldwideDigiKey 308
Mouser Electronics 167
TI Lead Time*: 20 WeeksUC3842NG4
AsiaFarnell Asia 322
EuropeFarnell 271
WorldwideDigiKey  Available
Mouser Electronics 890
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
UC3842D RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3842D8 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3842D8G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3842D8TR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3842D8TRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3842DG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3842DTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3842DTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC3842N RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC3842NG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC3842P      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 UC3842 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
TL494 PWM Control Circuit AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
TL431 Adjustable Precision Shunt Regulator VOLTAGE REFERENCE-SHUNT VOLTAGE REFERENCE TI customers also evaluated this product.
TPS5430 5.5V to 36V, 3A, 500kHz Step Down SWIFT™ Converter DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS TI customers also evaluated this product.

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