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UC2825A-Q1 Status: ACTIVE

Automotive Catalog High-Speed PWM Controller


      
         
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Datasheet

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 UC2825A-Q1
TopologyBoost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull  
Control MethodCurrent Mode  
Duty Cycle(Max)(%)50  
PWM Outputs(#)2  
Frequency(Max)(kHz)1000  
UVLO Thresholds On/Off(V)9.2/8.4  
Pin/Package16SOIC  
Regulated Outputs(#)2  
 Samples
 Inventory

Other qualified versions of UC2825A-Q1

Version Part Number Definition
Catalog UC2825A TI's standard catalog product
Enhanced Product UC2825A-EP Supports Defense, Aerospace and Medical Applications

Customers Who Evaluated This Product Also Evaluated

  • UC2825A-EP: Enhanced Product High-Speed Pwm Controller
  • UCC28220-Q1: Automotive Catalog Interleaved Dual PWM Controller With Programmable Max Duty Cycle
  • UC3825A: High Speed PWM Controller
  • TPS40195: 4.5V to 20V Buck Controller with Synchronization and Power Good
  • TPS40211: Wide Input Range Current Mode Boost Controller

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Product Information

Features

  • Qualified for Automotive Applications
  • Improved Version of the UC3825 PWM
  • Compatible With Voltage-Mode or Current-Mode Control Methods
  • Practical Operation at Switching Frequencies to 1 MHz
  • 50-ns Propagation Delay to Output
  • High-Current Dual Totem-Pole Outputs: 2 A (Peak)
  • Trimmed Oscillator Discharge Current
  • Low 100-µA Startup Current
  • Pulse-by-Pulse Current-Limiting Comparator
  • Latched Overcurrent Comparator With Full-Cycle Restart

Description

The UC2825A pulse-width modulation (PWM) controller is an improved versions of the standard UC3825. Performance enhancements have been made to several of the circuit blocks. Error amplifier gain bandwidth product is 12 MHz, while input offset voltage is 2 mV. Current limit threshold is specified to a tolerance of 5%. Oscillator discharge current is specified at 10 mA for accurate dead-time control. Frequency accuracy is improved to 6%. Startup supply current, typically 100 µA, is ideal for off-line applications. The output drivers are redesigned to actively sink current during undervoltage lockout (UVLO) at no expense to the startup current specification. In addition, each output is capable of 2-A peak currents during transitions.

Functional improvements have also been implemented. The shutdown comparator is now a high-speed overcurrent comparator with a threshold of 1.2 V. The overcurrent comparator sets a latch that ensures full discharge of the soft-start capacitor before allowing a restart. While the fault latch is set, the outputs are in the low state. In the event of continuous faults, the soft-start capacitor is fully charged before discharge to insure that the fault frequency does not exceed the designed soft start period. The CLOCK pin has become CLK/LEB. This pin combines the functions of clock output and leading edge blanking adjustment and has been buffered for easier interfacing.

The UC2825A has dual alternating outputs and the same pin configuration of the UC3825. "A" version parts have UVLO thresholds identical to the original UC3825.

See the application report, The UC3823A,B and UC3825A,B Enhanced Generation of PWM Controllers (SLUA125) for detailed technical and application information.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC2825AQDWRQ1ACTIVE-40 to 1253.10 | 1kuSOIC (DW) | 16 View 2000 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 9:50 AM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
Call**UC2825AQDWRQ1
WorldwideDigiKey 30
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
UC2825AQDWRQ1 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView

* 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 UC2825A-Q1 Help

Datasheet

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UC2825A-EP Enhanced Product High-Speed Pwm Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UCC28220-Q1 Automotive Catalog Interleaved Dual PWM Controller With Programmable Max Duty Cycle AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC3825A High Speed PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC2825 High Speed PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC2856-Q1 Automotive Catalog Improved Current Mode PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC2825A High Speed 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.
UCC2808A-2 Low-Power Current-Mode Push-Pull PWM AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UCC2808A-1 Low-Power Current-Mode Push-Pull PWM AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
TPS40195 4.5V to 20V Buck Controller with Synchronization and Power Good NON-ISOLATED SWITCHING DC/DC REGULATORS-DC/DC CONTROLLERS (EXTERNAL SWITCH) TI customers also evaluated this product.
TPS40211 Wide Input Range Current Mode Boost Controller NON-ISOLATED SWITCHING DC/DC REGULATORS-DC/DC CONTROLLERS (EXTERNAL SWITCH) TI customers also evaluated this product.

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