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UC1856 Status: ACTIVE

Improved Current Mode PWM Controller


      
         
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Datasheet

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 UC1856UC2856 UC3856 
TopologyBoost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull  Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull  Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull  
Control MethodCurrent Mode  Current Mode  Current Mode  
Duty Cycle(Max)(%)50  50  50  
PWM Outputs(#)2  2  2  
Frequency(Max)(kHz)1000  1000  1000  
UVLO Thresholds On/Off(V)7.7/7  7.7/7  7.7/7  
Pin/Package16CDIP, 20LCCC  16PDIP, 16SOIC  16PDIP, 16SOIC, 20PLCC  
Regulated Outputs(#)2  2  2  
 SamplesSamplesSamples
 InventoryInventoryInventory

Other qualified versions of UC1856

Version Part Number Definition
Catalog UC3856 TI's standard catalog product

Customers Who Evaluated This Product Also Evaluated

  • UC2856: Improved Current Mode PWM Controller
  • UC3846: Current Mode PWM Controller
  • UC2846: Current Mode PWM Controller

More Related Products

Product Information

Features

  • Pin-for-Pin Compatible With the UC3846
  • 65ns Typical Delay From Shutdown to Outputs, and 50ns Typical Delay From Sync to Outputs
  • Improved Current Sense Amplifier With Reduced Noise Sensitivity
  • Differential Current Sense with 3V Common Mode Range
  • Trimmed Oscillator Discharge Current for Accurate Deadband Control
  • Accurate 1V Shutdown Threshold
  • High Current Dual Totem Pole Outputs (1.5A peak)
  • TTL Compatible Oscillator SYNC Pin Thresholds
  • 4kV ESD Protection

Description

The UC3856 is a high performance version of the popular UC3846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A peak output stages have been added to allow rapid switching of power FETs.

A low impedance TTL compatible sync output has been implemented with a tri-state function when used as a sync input.

Internal chip grounding has been improved to minimize internal \x93noise\x94 caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier results in enhanced noise immunity.

View All Description in Datasheet

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Replaced ByDSCC #Price | QuantityPackage | PinsPackage QTY | Package CarrierSymbolsFootprintsSamples
5962-9453001M2AACTIVE-55 to 125  25.83 | 100uLCCC (FK) | 20 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
5962-9453001MEAACTIVE-55 to 125  18.01 | 100uCDIP (J) | 16 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC1856JACTIVE-55 to 125  15.41 | 100uCDIP (J) | 16 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1856J883BACTIVE-55 to 125 5962-9453001MEA18.01 | 100uCDIP (J) | 16 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1856LOBSOLETE-55 to 125UC1856L20  (L) | 28    Replaced by UC1856L20
UC1856L20ACTIVE-55 to 125  23.11 | 100uLCCC (FK) | 20 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1856L20883BACTIVE-55 to 125 5962-9453001M2A25.83 | 100uLCCC (FK) | 20 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1856L883BOBSOLETE-55 to 125UC1856L20883B  (L) | 28    Replaced by UC1856L20883B

* 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, 25 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 8 Weeks5962-9453001M2A
AmericasRochester Electronics 1
TI Lead Time*: 8 Weeks5962-9453001MEA
None Reported
View Distributors
TI Lead Time*: 8 WeeksUC1856J
AmericasArrow >1k
Avnet 8
TI Lead Time*: 8 WeeksUC1856J883B
AmericasArrow 183
EuropeEBV Elektronik 2
TI Lead Time*: 8 WeeksUC1856L20
None Reported
View Distributors
TI Lead Time*: 8 WeeksUC1856L20883B
AmericasRochester Electronics 27
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
5962-9453001M2A  TBD POST-PLATE N/A for Pkg TypeViewView
5962-9453001MEA  TBD A42  N/A for Pkg TypeViewView
UC1856J  TBD A42  N/A for Pkg TypeViewView
UC1856J883B  TBD A42  N/A for Pkg TypeViewView
UC1856L20  TBD POST-PLATE N/A for Pkg TypeViewView
UC1856L20883B  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 UC1856 Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UC2856 Improved Current Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC3846 Current Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC2846 Current Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC3856 Improved Current Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC1846 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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