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UC1845A Status: ACTIVE

Current Mode PWM Controller


      
         
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Datasheet

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Functional Block Diagram


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 UC1845AUC1845A-EP UC2845A UC3845A 
TopologyBoost, Flyback, Forward   Boost, 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)8.4/7.6  8.5/7.9  8.4/7.6  8.4/7.6  
Pin/Package20LCCC, 8CDIP  8SOIC  14SOIC, 16SOIC, 8PDIP, 8SOIC  14SOIC, 8PDIP, 8SOIC  
Regulated Outputs(#)1  1  1  1  
 SamplesSamplesSamplesSamples
 InventoryInventoryInventoryInventory

Other qualified versions of UC1845A

Version Part Number Definition
Catalog UC3845A TI's standard catalog product
Enhanced Product UC1845A-EP Supports Defense, Aerospace and Medical Applications
Space UC1845A-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application

Customers Who Evaluated This Product Also Evaluated

  • UC1845: Current Mode PWM Controller
  • UC1845A-EP: Enhanced Product Current-Mode Pwm Controller
  • UC1845A-SP: 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
5962-8670408PAACTIVE-55 to 125 8.05 | 100uCDIP (JG) | 8 View 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
5962-8670408XAACTIVE-55 to 125 15.24 | 100uLCCC (FK) | 20  1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC1845AJACTIVE-55 to 125 5.04 | 100uCDIP (JG) | 8 View 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1845AJ883BACTIVE-55 to 1255962-8670408PA8.05 | 100uCDIP (JG) | 8 View 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1845AL883BACTIVE-55 to 1255962-8670408XA15.24 | 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 Weeks5962-8670408PA
AmericasArrow 171
Avnet 22
Rochester Electronics 11
TI Lead Time*: 8 Weeks5962-8670408XA
AmericasRochester Electronics 57
TI Lead Time*: 8 WeeksUC1845AJ
AmericasArrow 141
Avnet 504
EuropeEBV Elektronik 28
TI Lead Time*: 8 WeeksUC1845AJ883B
AmericasAvnet 25
EuropeEBV Elektronik 8
TI Lead Time*: 8 WeeksUC1845AL883B
AmericasRochester Electronics 273
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
5962-8670408PA  TBD A42  N/A for Pkg TypeViewView
5962-8670408XA  TBD POST-PLATE N/A for Pkg TypeViewView
UC1845AJ  TBD A42  N/A for Pkg TypeViewView
UC1845AJ883B  TBD A42  N/A for Pkg TypeViewView
UC1845AL883B  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 UC1845A Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UC1845 Current Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC1845A-EP Enhanced Product Current-Mode Pwm Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC1845A-SP 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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