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UC3854A Status: ACTIVE

Enhanced High Power Factor Preregulator


      
         
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Datasheet

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 UC2854A UC3854A
UVLO Thresholds On/Off(V)16/10  16/10  
Operating Supply(Max)(V)20  20  
Startup Current(mA)0.25  0.25  
Operating Supply Current(mA)12  12  
Vref(V)7.5  7.5  
Vref tol(%)1.3  1.3  
Duty Cycle(Max)(%)95  95  
Practical Operating Frequency(Max)(MHz)0.2  0.2  
Pin/Package16PDIP, 16SOIC  16PDIP, 16SOIC  
RatingCatalog  Catalog  
 SamplesSamples
 InventoryInventory

Other qualified versions of UC3854A

Version Part Number Definition
Military UC1854A QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

  • UC3854: High Power Factor Preregulator
  • UC3854B: Enhanced High Power Factor Preregulator

Product Information

Features

  • Controls Boost PWM to Near-Unity Power Factor
  • Limits Line Current Distortion To <3%
  • World-Wide Operation Without Switches
  • Accurate Power Limiting
  • Fixed-Frequency Average Current-Mode Control
  • High Bandwidth (5 MHz), Low-Offset Current Amplifier
  • Integrated Current- and Voltage-Amplifier Output Clamps
  • Multiplier Improvements: Linearity, 500 mV VAC Offset (Eliminates External Resistor), 0 V to 5 V Multout Common-Mode Range
  • VREF GOOD Comparator
  • Faster and Improved Accuracy ENABLE Comparator
  • UVLO Options (16 V/10 V or 10.5 V/10 V)
  • 300-µA Start-Up Supply Current

Description

The UC3854A/B products are pin compatibleenhanced versions of the UC3854. Like the UC3854, these products provide all of the functions necessary for active power factor corrected preregulators. The controller achieves near unity power factor by shaping the ac input line current waveform to correspond to the ac input line voltage. To do this the UC3854A/B uses average current mode control. Average current mode control maintains stable, low distortion sinusoidal line current without the need for slope compensation, unlike peak current mode control.

A 1%, 7.5-V reference, fixed frequency oscillator, PWM, voltage amplifierwith soft-start, line voltage feedforward (VRMS squarer), input supply voltage clamp, and over current comparator round out the lilst of feataures.

View All Description in Datasheet

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC3854ADWACTIVE0 to 701.50 | 1kuSOIC (DW) | 16 View 40 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3854ADWG4ACTIVE0 to 701.50 | 1kuSOIC (DW) | 16 View 40 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3854ADWTRACTIVE0 to 701.45 | 1kuSOIC (DW) | 16 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3854ADWTRG4ACTIVE0 to 701.45 | 1kuSOIC (DW) | 16 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3854ANACTIVE0 to 701.50 | 1kuPDIP (N) | 16 View 25 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3854ANG4ACTIVE0 to 701.50 | 1kuPDIP (N) | 16 View 25 | 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 WeeksUC3854ADW
AmericasAvnet 900
Newark 783
Rochester Electronics >1k
AsiaWPI 56
EuropeArrow Northern Europe 120
Avnet-SILICA 760
WorldwideDigiKey 568
TI Lead Time*: 20 WeeksUC3854ADWG4
AsiaFarnell Asia 149
EuropeFarnell 139
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3854ADWTR
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3854ADWTRG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC3854AN
AmericasAvnet 165
Newark 46
Rochester Electronics >1k
AsiaFarnell Asia 46
WPI 184
EuropeArrow Southern Europe 25
Avnet-SILICA 175
Compel 42
TI Lead Time*: 20 WeeksUC3854ANG4
None Reported
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** 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
UC3854ADW RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3854ADWG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3854ADWTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3854ADWTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3854AN RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC3854ANG4 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 UC3854A Help

Datasheet

Application Notes

View Application Notes for Power Factor Correction ICs

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UC3854 High Power Factor Preregulator AC/DC AND DC/DC POWER SUPPLIES-POWER FACTOR CORRECTION ICS TI customers also evaluated this product.
UC3854B Enhanced High Power Factor Preregulator AC/DC AND DC/DC POWER SUPPLIES-POWER FACTOR CORRECTION ICS TI customers also evaluated this product.

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