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UC3854B Status: ACTIVE

Enhanced High Power Factor Preregulator


      
         
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 UC1854B UC2854B UC3854B
UVLO Thresholds On/Off(V)10.5/10  10.5/10  10.5/10  
Operating Supply(Max)(V)20  20  20  
Startup Current(mA)0.25  0.25  0.25  
Operating Supply Current(mA)12  12  12  
Vref(V)7.5  7.5  7.5  
Vref tol(%)1.3  1.3  1.3  
Duty Cycle(Max)(%)95  95  95  
Practical Operating Frequency(Max)(MHz)0.2  0.2  0.2  
Pin/Package16CDIP  16PDIP, 16SOIC, 20PLCC  16PDIP, 16SOIC  
RatingMilitary  Catalog  Catalog  
 SamplesSamplesSamples
 InventoryInventoryInventory

Other qualified versions of UC3854B

Version Part Number Definition
Military UC1854B QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

  • UC3854: High Power Factor Preregulator
  • UC2854B: Enhanced High Power Factor Preregulator
  • UC3854A: Enhanced High Power Factor Preregulator
  • LP2985A-50: Single Output LDO, 150mA, Fixed(5.0V), 1.0% Tolerance, Low Quiescent Current, Low Noise
  • UC2875: Phase Shift Resonant Controller
  • UCD7100: Digital Control Compatible Single Low-Side +/- 4Amp MOSFET Driver with Current Sense

More Related Products

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.

Available in the 16-pin N (PDIP), DW (SOIC Wide), and J (CDIP) and 20-pin Q (PLCC) package. See Ordering Information table for availability by temperature range.

The UC3854A/B products improve upon the UC3854 by offering a wide bandwidth, low offset current amplifier, a faster responding and improved accuracy enable comparator, a VREF GOOD comparator, UVLO threshold options (16 V/10 V for offline, 10.5 V/10 V for startup from an auxiliary 12-V regulator), lower startup supply current, and an enhanced multiply/divide circuit. New features like the amplifier output clamps, improved amplifier current sinking capability, and low offset VAC pin reduce the external component count while improving performance. Improved common mode input range of the multiplier output/current amplifier input allow the designer greater flexibility in choosing amethod for current sensing. Unlike its predecessor, RSET controls only oscillator charging current and has no effect on clamping the maximum multiplier output current. This current is now clamped to a maximum of 2 × IAC at all times which simplifies the design process and provides foldback power limiting during brownout and extreme low line conditions.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC3854BDWACTIVE0 to 701.50 | 1kuSOIC (DW) | 16 View 40 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3854BDWG4ACTIVE0 to 701.50 | 1kuSOIC (DW) | 16 View 40 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3854BDWTRACTIVE0 to 701.45 | 1kuSOIC (DW) | 16 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3854BDWTRG4ACTIVE0 to 701.45 | 1kuSOIC (DW) | 16 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC3854BNACTIVE0 to 701.80 | 1kuPDIP (N) | 16 View 25 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3854BNG4ACTIVE0 to 701.80 | 1kuPDIP (N) | 16 View 25 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC3854BQOBSOLETE0 to 70 UTR | 20     Not 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 9:48 AM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksUC3854BDW
AmericasArrow >1k
Newark 4
Rochester Electronics >1k
AsiaFarnell Asia 34
EuropeArrow Northern Europe 80
Avnet-SILICA 440
Farnell 34
WorldwideMouser Electronics 37
TI Lead Time*: 20 WeeksUC3854BDWG4
AsiaFarnell Asia 115
EuropeFarnell 106
TI Lead Time*: 20 WeeksUC3854BDWTR
AmericasRochester Electronics >1k
TI Lead Time*: 20 WeeksUC3854BDWTRG4
None Reported
View Distributors
TI Lead Time*: 20 WeeksUC3854BN
AsiaFarnell Asia 52
EuropeArrow Southern Europe 250
Farnell 52
Spoerle 175
WorldwideMouser Electronics 2
TI Lead Time*: 20 WeeksUC3854BNG4
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
UC3854BDW RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3854BDWG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3854BDWTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3854BDWTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC3854BN RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC3854BNG4 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 UC3854B Help

Datasheet

Application Notes

View Application Notes for Power Factor Correction ICs

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