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UC2841 Status: ACTIVE

Programmable, Off-Line, PWM Controller


      
         
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Datasheet

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 UC2841UC3841 
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

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  • UCC35705: High Speed Voltage Mode Pulse Width Modulator
  • UCC25706: High Speed Voltage Mode Pulse Width Modulator
  • UCC35706: High Speed Voltage Mode Pulse Width Modulator

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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.

While pin compatible with the UC1840 in all respects except that the polarity of the External Stop has been reversed, the UC1841 offers the following improvements:

1. Fault latch reset is accomplished with slow start discharge rather than recycling the input voltage to the chip.

2. The External Stop input can be used for a fault delay to resist shutdown from short duration transients.

3. The duty-cycle clamping function has been characterized and specified.

The UC1841 is characterized for -55°C to +125°C operation while the UC2841 and UC3841 are designed for -25°C to +85°C and 0°to +70°C, respectively.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC2841DWACTIVE-40 to 856.45 | 1kuSOIC (DW) | 18 View 40 | TUBE Download CAD Format for this Symbol Purchase Samples
UC2841DWG4ACTIVE-40 to 856.45 | 1kuSOIC (DW) | 18 View 40 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2841JOBSOLETE-40 to 85 CDIP (J) | 18     Not Available
UC2841NACTIVE-40 to 856.45 | 1kuPDIP (N) | 18 View 20 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2841NG4ACTIVE-40 to 856.45 | 1kuPDIP (N) | 18 View 20 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples

* 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 9:50 AM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 1 WeekUC2841DW
AmericasArrow 66
Avnet 29
Rochester Electronics >1k
TI Lead Time*: 1 WeekUC2841DWG4
None Reported
View Distributors
TI Lead Time*: 1 WeekUC2841N
AmericasRochester Electronics >1k
WorldwideMouser Electronics 36
TI Lead Time*: 1 WeekUC2841NG4
None Reported
View Distributors
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
UC2841DW RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC2841DWG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC2841N RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC2841NG4 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 UC2841 Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
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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.
UCC25706 High Speed Voltage Mode Pulse Width Modulator AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UCC35706 High Speed Voltage Mode Pulse Width Modulator AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC3823B High Speed PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
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