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UC2845A Status: ACTIVE

Current Mode PWM Controller


      
         
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Functional Block Diagram


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 UC1845A UC2845AUC3845A 
TopologyBoost, Flyback, Forward  Boost, Flyback, Forward  Boost, Buck, Flyback, Forward  
Control MethodCurrent Mode  Current Mode  Current Mode  
Duty Cycle(Max)(%)50  50  50  
PWM Outputs(#)1  1  1  
Frequency(Max)(kHz)450  450  450  
UVLO Thresholds On/Off(V)8.4/7.6  8.4/7.6  8.4/7.6  
Pin/Package20LCCC, 8CDIP  14SOIC, 16SOIC, 8PDIP, 8SOIC  14SOIC, 8PDIP, 8SOIC  
Regulated Outputs(#)1  1  1  
 SamplesSamplesSamples
 InventoryInventoryInventory

Customers Who Evaluated This Product Also Evaluated

  • UC2845: Current-Mode PWM Controller
  • UC3845: Current-Mode PWM Controller
  • UCC28051: PFC Controller for low to medium power applications requiring compliance with IEC 1000-3-2
  • TPS2061: Single 1A Current-Limited, Power-Distribution Switch
  • TPS40210: Wide Input Range Current Mode Boost 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)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC2845ADACTIVE-40 to 851.15 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2845AD8ACTIVE-40 to 851.15 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2845AD8G4ACTIVE-40 to 851.15 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2845AD8TRACTIVE-40 to 851.15 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845AD8TRG4ACTIVE-40 to 851.15 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845ADG4ACTIVE-40 to 851.15 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2845ADTRACTIVE-40 to 851.15 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845ADTRG4ACTIVE-40 to 851.15 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845ADWACTIVE-40 to 851.35 | 1kuSOIC (DW) | 16 View 40 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845ADWG4ACTIVE-40 to 851.35 | 1kuSOIC (DW) | 16 View 40 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845ANACTIVE-40 to 851.15 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2845ANG4ACTIVE-40 to 851.15 | 1kuPDIP (P) | 8 View 50 | 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 9:55 AM GMT, 26 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksUC2845AD
AmericasArrow 514
Avnet 100
Rochester Electronics >1k
AsiaWPI 74
EuropeAvnet-SILICA 150
Spoerle 450
WorldwideDigiKey 89
Mouser Electronics 27
TI Lead Time*: 20 WeeksUC2845AD8
AmericasArrow >1k
Newark 47
Rochester Electronics 50
EuropeAvnet-SILICA 3
TI Lead Time*: 20 WeeksUC2845AD8G4
AsiaFarnell Asia 125
EuropeCompel 37
TI Lead Time*: 20 WeeksUC2845AD8TR
AmericasArrow >1k
Rochester Electronics >1k
TI Lead Time*: 20 WeeksUC2845AD8TRG4
None Reported
View Distributors
TI Lead Time*: 20 WeeksUC2845ADG4
AsiaFarnell Asia 108
EuropeEBV Elektronik 25
Farnell 108
WorldwideDigiKey  Available
Mouser Electronics 238
TI Lead Time*: 20 WeeksUC2845ADTR
AmericasArrow >1k
Rochester Electronics >1k
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC2845ADTRG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC2845ADW
AmericasArrow 580
Rochester Electronics >1k
TI Lead Time*: 20 WeeksUC2845ADWG4
None Reported
View Distributors
TI Lead Time*: 20 WeeksUC2845AN
AmericasAvnet 724
Newark 143
Rochester Electronics >1k
AsiaFarnell Asia 220
WPI 55
WorldwideDigiKey >1k
Mouser Electronics 957
TI Lead Time*: 20 WeeksUC2845ANG4
AsiaFarnell Asia 314
EuropeFarnell 307
WorldwideDigiKey  Available
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
UC2845AD RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845AD8 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845AD8G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845AD8TR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845AD8TRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845ADG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845ADTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845ADTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845ADW RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC2845ADWG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC2845AN RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC2845ANG4 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 UC2845A Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UC2845 Current-Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC3845 Current-Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UCC28051 PFC Controller for low to medium power applications requiring compliance with IEC 1000-3-2 AC/DC AND DC/DC POWER SUPPLIES-POWER FACTOR CORRECTION ICS TI customers also evaluated this product.
TPS2061 Single 1A Current-Limited, Power-Distribution Switch PCMCIA AND USB-USB POWER SWITCHES TI customers also evaluated this product.
TPS40210 Wide Input Range Current Mode Boost Controller NON-ISOLATED SWITCHING DC/DC REGULATORS-DC/DC CONTROLLERS (EXTERNAL SWITCH) TI customers also evaluated this product.
TPS3808G09 Low Quiescent Current, Programmable-Delay Supervisory Circuit POWER MANAGEMENT-SUPERVISORY CIRCUITS(VOLTAGE SUPERVISORS) TI customers also evaluated this product.
TPS62040 Adjustable, 1.2-A, 95% Efficient Step-Down Converter, 18uA, MSOP-10 DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS TI customers also evaluated this product.
TPS65023 6-channel Power Mgmt IC with 3DC/DCs, 3 LDOs, I2C Interface and DVS, Optimized for DaVinci DSPs POWER MANAGEMENT MULTI-CHANNEL IC (PMIC) SOLUTIONS-PMIC SOLUTIONS WITH AND WITHOUT BATTERY CHARGER TI customers also evaluated this product.
TLV1117-25 Single Output LDO, 800mA, Fixed(2.5V), Internal Current limit, Thermal Overload Protection LINEAR REGULATORS-STANDARD VOLTAGE REGULATORS TI customers also evaluated this product.
LM4040A30 3-V Precision Micropower Shunt Voltage Reference, 0.1% accuracy VOLTAGE REFERENCE-SHUNT VOLTAGE REFERENCE TI customers also evaluated this product.

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