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UC1844A Status: ACTIVE

Current Mode PWM Controller


      
         
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Datasheet

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Functional Block Diagram


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 UC1844AUC1844A-EP UC2844A UC3844A 
TopologyBoost, Flyback, Forward   Boost, Buck, Flyback, Forward  Boost, Buck, Flyback, Forward  
Control MethodCurrent Mode  Current Mode  Current Mode  Current Mode  
Duty Cycle(Max)(%)50  50  50  50  
PWM Outputs(#)1  1  1  1  
Frequency(Max)(kHz)450  500  450  450  
UVLO Thresholds On/Off(V)16/10  16/10  16/10  16/10  
Pin/Package20LCCC, 8CDIP  8SOIC  14SOIC, 8PDIP, 8SOIC  14SOIC, 8PDIP, 8SOIC  
Regulated Outputs(#)1  1  1  1  
 SamplesSamplesSamplesSamples
 InventoryInventoryInventoryInventory

Other qualified versions of UC1844A

Version Part Number Definition
Catalog UC3844A TI's standard catalog product
Enhanced Product UC1844A-EP Supports Defense, Aerospace and Medical Applications
Space UC1844A-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application

Customers Who Evaluated This Product Also Evaluated

  • UC3844A: Current Mode PWM Controller

Product Information

Features

  • Optimized for Off-line and DC to DC Converters
  • Low Start Up Current (<0.5mA)
  • Trimmed Oscillator Discharge Current
  • Automatic Feed Forward Compensation
  • 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
  • 500kHz Operation
  • Low RO Error Amp

Description

The UC1842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5mA. Oscillator discharge is trimmed to 8.3mA. During under voltage lockout, the output stage can sink at least 10mA at less than 1.2V for VCC over 5V.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)DSCC #Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
5962-8670407PAACTIVE-55 to 125 8.05 | 100uCDIP (JG) | 8 View 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
5962-8670407XAACTIVE-55 to 125 13.25 | 100uLCCC (FK) | 20  1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC1844AJACTIVE-55 to 125 4.95 | 100uCDIP (JG) | 8 View 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1844AJ883BACTIVE-55 to 1255962-8670407PA8.05 | 100uCDIP (JG) | 8 View 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1844AL883BACTIVE-55 to 1255962-8670407XA13.25 | 100uLCCC (FK) | 20  1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office

* 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 9:54 AM GMT, 22 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 8 Weeks5962-8670407PA
AmericasArrow 55
Avnet 43
Rochester Electronics 13
TI Lead Time*: 8 Weeks5962-8670407XA
None Reported
View Distributors
TI Lead Time*: 8 WeeksUC1844AJ
AmericasArrow >1k
Avnet 136
Rochester Electronics >1k
EuropeEBV Elektronik 3
TI Lead Time*: 8 WeeksUC1844AJ883B
AmericasArrow 15
Avnet 55
Rochester Electronics 693
TI Lead Time*: 8 WeeksUC1844AL883B
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
5962-8670407PA  TBD A42  N/A for Pkg TypeViewView
5962-8670407XA  TBD POST-PLATE N/A for Pkg TypeViewView
UC1844AJ  TBD A42  N/A for Pkg TypeViewView
UC1844AJ883B  TBD A42  N/A for Pkg TypeViewView
UC1844AL883B  TBD POST-PLATE 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 UC1844A Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UC3844A Current Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.

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