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UC2845 Status: ACTIVE

Current-Mode PWM Controller


      
         
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Datasheet

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 UC1845 UC2845UC3845 
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/Package14CFP, 20LCCC, 8CDIP  14SOIC, 8PDIP, 8SOIC  14SOIC, 8PDIP, 8SOIC  
Regulated Outputs(#)1  1  1  
 SamplesSamplesSamples
 InventoryInventoryInventory

Customers Who Evaluated This Product Also Evaluated

  • UC2845A: Current Mode PWM Controller
  • TPS61085: 18.5V, 2A, 650kHz, 1.2MHz Step-Up DC-DC Converter with Forced PWM Mode
  • TPS5430: 5.5V to 36V, 3A, 500kHz Step Down SWIFT™ Converter
  • TPS51200: Sink/Source DDR Termination Regulator

Product Information

Features

  • Optimized For Off-line and DC-to-DC Converters
  • Low Start-Up Current (<1 mA)
  • Automatic Feed ForwardCompensation
  • 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
  • 500-kHz Operation
  • Low RO Error Amp

Description

The UC1842/3/4/5 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.

Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges.

View All Description in Datasheet

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC2845DACTIVE-40 to 851.25 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845D8ACTIVE-40 to 851.25 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845D8G4ACTIVE-40 to 851.25 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845D8TRACTIVE-40 to 851.25 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845D8TRG4ACTIVE-40 to 851.25 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845DG4ACTIVE-40 to 851.25 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845DTRACTIVE-40 to 851.25 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845DTRG4ACTIVE-40 to 851.25 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2845JOBSOLETE-40 to 85 CDIP (JG) | 8 View    Not Available
UC2845NACTIVE-40 to 851.25 | 1kuPDIP (P) | 8 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2845NG4ACTIVE-40 to 851.25 | 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 9:54 AM GMT, 25 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksUC2845D
AmericasAvnet 50
Rochester Electronics 490
EuropeCompel 925
WorldwideMouser Electronics 363
TI Lead Time*: 20 WeeksUC2845D8
AmericasRochester Electronics >1k
AsiaWPI 98
TI Lead Time*: 20 WeeksUC2845D8G4
AmericasAvnet 100
TI Lead Time*: 20 WeeksUC2845D8TR
None Reported
View Distributors
TI Lead Time*: 20 WeeksUC2845D8TRG4
None Reported
View Distributors
TI Lead Time*: 20 WeeksUC2845DG4
AsiaFarnell Asia 110
EuropeFarnell 93
TI Lead Time*: 20 WeeksUC2845DTR
AmericasAvnet >1k
TI Lead Time*: 20 WeeksUC2845DTRG4
None Reported
View Distributors
TI Lead Time*: 20 WeeksUC2845N
AmericasRochester Electronics >1k
AsiaFarnell Asia 22
EuropeAvnet-SILICA >1k
Farnell 22
TI Lead Time*: 20 WeeksUC2845NG4
AsiaFarnell Asia 721
EuropeEBV Elektronik 200
Farnell 714
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
UC2845D RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845D8 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845D8G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845D8TR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845D8TRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845DG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845DTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845DTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
UC2845N RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC2845NG4 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 UC2845 Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

Selection Guides

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UC2845A Current Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
TPS61085 18.5V, 2A, 650kHz, 1.2MHz Step-Up DC-DC Converter with Forced PWM Mode DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-UP REGULATORS TI customers also evaluated this product.
TPS5430 5.5V to 36V, 3A, 500kHz Step Down SWIFT™ Converter DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS TI customers also evaluated this product.
TPS51200 Sink/Source DDR Termination Regulator LINEAR REGULATORS-SINGLE CHANNEL LDO TI customers also evaluated this product.
TPS54286 Dual 2A Non-Synchronous Step Down SWIFT™ Converter with Integrated High Side MOSFET, 600 kHz DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS TI customers also evaluated this product.
TPS51117 1.8V to 28V Input Sync. Step Down Controller with DCAP™ Mode, Optimized for Light Load Efficiency NON-ISOLATED SWITCHING DC/DC REGULATORS-DC/DC CONTROLLERS (EXTERNAL SWITCH) TI customers also evaluated this product.
TL431A Adjustable Precision Shunt Regulator VOLTAGE REFERENCE-SHUNT VOLTAGE REFERENCE TI customers also evaluated this product.
TPS54231 2A, 28V Input, 570 kHz Step Down SWIFT™ DC/DC Converter with Eco-Mode ™ DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS TI customers also evaluated this product.
TPS54160 3.5V to 60V, 1.5A Step Down SWIFT™ Converter with Eco-Mode™ DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS TI customers also evaluated this product.
TL431 Adjustable Precision Shunt Regulator VOLTAGE REFERENCE-SHUNT VOLTAGE REFERENCE TI customers also evaluated this product.
TPS54325 4.5V to 18V Input, 3A Synchronous Step Down SWIFT™ Converter with D-CAP2™ Mode DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS TI customers also evaluated this product.

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