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UC3846M Status: ACTIVE

Current Mode PWM Controller


      
         
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Datasheet

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 UC3846M
TopologyBoost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull  
Control MethodCurrent Mode  
Duty Cycle(Max)(%)50  
PWM Outputs(#)2  
Frequency(Max)(kHz)450  
UVLO Thresholds On/Off(V)7.7/6.95  
Pin/Package16CDIP  
Regulated Outputs(#)2  
 Samples
 Inventory

Other qualified versions of UC3846M

Version Part Number Definition
Catalog UC3846 TI's standard catalog product

Customers Who Evaluated This Product Also Evaluated

  • UC3846: Current Mode PWM Controller
  • UCC3895: BiCMOS Advanced Phase Shift PWM Controller
  • UC3825: High Speed PWM Controller

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Product Information

Features

  • Automatic Feed Forward Compensation
  • Programmable Pulse-by-Pulse Current Limiting
  • Automatic Symmetry Correction in Push-pull Configuration
  • Enhanced Load Response Characteristics
  • Parallel Operation Capability for Modular Power Systems
  • Differential Current Sense Amplifier with Wide Common Mode Range
  • Double Pulse Suppression
  • 500mA (Peak) Totem-pole Outputs
  • ±1% Bandgap Reference
  • Under-voltage Lockout
  • Soft Start Capability
  • Shutdown Terminal
  • 500kHZ Operation

Description

The UC1846/7 family of control ICs provides all of the necessary features to implement fixed frequency, current mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel "power modules" while maintaining equal current sharing.

Protection circuitry includes built-in under-voltage lockout and programmable current limit in addition to soft start capability. A shut-down function is also available which can initiate either a complete shutdown with automatic restart or latch the supply off.

Other features include fully latched operation, double pulse suppression, deadline adjust capability, and a ±1% trimmed bandgap reference.

The UC1846 features low outputs in the OFF state, while the UC1847 features high outputs in the OFF state.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsPackage QTY | Package CarrierSymbolsFootprintsSamples
UC3846JACTIVE0 to 706.91 | 100uCDIP (J) | 16 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 9:48 AM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 8 WeeksUC3846J
AmericasRochester Electronics >1k
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** 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
UC3846J  TBD A42  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 UC3846M Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UC3846 Current Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UCC3895 BiCMOS Advanced Phase Shift PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC3825 High Speed PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
SG3524 Regulating Pulse-Width Modulators AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC3875 Phase Shift Resonant Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
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UC3824 High Speed PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC2827-2 Buck Current/Voltage Fed Push-Pull PWM Controllers AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC3825M High Speed PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC1525B-SP Regulating Pulse Width Modulators AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.

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