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UC3841 Status: ACTIVE

Programmable, Off-Line, PWM Controller


      
         
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Datasheet

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 UC2841 UC3841
TopologyBoost, Buck, Flyback, Forward  Boost, Flyback, Forward  
Control MethodCurrent Mode, Voltage Mode  Current Mode, Voltage Mode  
Duty Cycle(Max)(%)95  95  
PWM Outputs(#)1  1  
Frequency(Max)(kHz)450  450  
UVLO Thresholds On/Off(V)8/7.8  8/7.8  
Pin/Package18PDIP, 18SOIC  18PDIP, 18SOIC  
Regulated Outputs(#)1  1  
 SamplesSamples
 InventoryInventory

Other qualified versions of UC3841

Version Part Number Definition
Military UC1841 QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

  • UCC3581: Micropower Voltage Mode PWM
  • UCC35705: High Speed Voltage Mode Pulse Width Modulator

Product Information

Features

  • All Control, Driving, Monitoring, and Protection Functions Included
  • Low-current, Off-line Start Circuit
  • Voltage Feed Forward or Current Mode Control
  • Guaranteed Duty Cycle Clamp
  • PWM Latch for Single Pulse per Period
  • Pulse-by-Pulse Current Limiting Plus Shutdown for Over-Current Fault
  • No Start-up or Shutdown Transients
  • Slow Turn-on Both Initially and After Fault Shutdown
  • Shutdown Upon Over- or Under-Voltage Sensing
  • Latch Off or Continuous Retry After Fault
  • PWM Output Switch Usable to 1A Peak Current
  • 1% Reference Accuracy
  • 500kHz Operation
  • 18 Pin DIL Package

Description

The UC1841 family of PWM controllers has been designed to increase the level of versatility while retaining all of the performance features of the earlier UC1840 devices. While still optimized for highly-efficient boot-strapped primary-side operation in forward or flyback power converters, the UC1841 is equally adept in implementing both low and high voltage input DC to DC converters. Important performance features include a low-current starting circuit, linear feed-forward for constant volt-second operation, and compatibility with either voltage or current mode topologies.

In addition to start-up and normal regulating PWM functions, these devices include built in protection from over-voltage, under-voltage, and over-current fault conditions with the option for either latch-off or automatic restart.

View All Description in Datasheet

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC3841DWACTIVE0 to 705.60 | 1kuSOIC (DW) | 18 View 40 | TUBE Download CAD Format for this Symbol Purchase Samples
UC3841DWG4ACTIVE0 to 705.60 | 1kuSOIC (DW) | 18 View 40 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3841DWTRACTIVE0 to 705.60 | 1kuSOIC (DW) | 18 View 2000 | LARGE T&R Download CAD Format for this Symbol Purchase Samples
UC3841DWTRG4ACTIVE0 to 705.60 | 1kuSOIC (DW) | 18 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3841JOBSOLETE0 to 70 CDIP (J) | 18     Not Available
UC3841NACTIVE0 to 705.60 | 1kuPDIP (N) | 18 View 20 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3841NG4ACTIVE0 to 705.60 | 1kuPDIP (N) | 18 View 20 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint

* 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 WeeksUC3841DW
AmericasRochester Electronics >1k
TI Lead Time*: 20 WeeksUC3841DWG4
None Reported
View Distributors
TI Lead Time*: 20 WeeksUC3841DWTR
AmericasRochester Electronics >1k
TI Lead Time*: 20 WeeksUC3841DWTRG4
None Reported
View Distributors
TI Lead Time*: 14 WeeksUC3841N
AmericasAvnet 44
Newark 57
Rochester Electronics >1k
EuropeArrow Northern Europe 20
Avnet-SILICA 100
WorldwideDigiKey 102
Mouser Electronics 48
TI Lead Time*: 14 WeeksUC3841NG4
WorldwideDigiKey  Available
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
UC3841DW RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3841DWG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3841DWTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3841DWTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3841N RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC3841NG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView

* 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 UC3841 Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UCC3581 Micropower Voltage Mode PWM AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UCC35705 High Speed Voltage Mode Pulse Width Modulator AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.

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