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UC2825A Status: ACTIVE

High Speed PWM Controller


      
         
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 UC1825A UC2825AUC3825A 
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, Voltage Mode  
Duty Cycle(Max)(%)50  50  50  
PWM Outputs(#)2  2  2  
Frequency(Max)(kHz)1000  1000  1000  
UVLO Thresholds On/Off(V)16/10  16/10  16/10  
Pin/Package16CDIP, 20LCCC  16PDIP, 16SOIC, 20PLCC  16PDIP, 16SOIC, 20PLCC  
Regulated Outputs(#)2  2  2  
 SamplesSamplesSamples
 InventoryInventoryInventory

Other qualified versions of UC2825A

Version Part Number Definition
Automotive UC2825A-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
Enhanced Product UC2825A-EP Supports Defense, Aerospace and Medical Applications

Customers Who Evaluated This Product Also Evaluated

  • UC2825: High Speed PWM Controller
  • UC3825A: High Speed PWM Controller
  • UC3825: High Speed PWM Controller

More Related Products

Product Information

Features

  • Improved versions of the UC3823/UC3825 PWMs
  • Compatible with Voltage-Mode or Current-Mode Control Methods
  • Practical Operation at Switching Frequencies to 1MHz
  • 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 UC3823A and UC3823B and the UC3825A and UC3825B family of PWM controllers are improved versions of the standard UC3823 and UC3825 family. 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 assured 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 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 in this family. The UC3825 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 UC3825 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 UC3825A and UC3825B have dual alternating outputs and the same pin configuration of the UC3825. The UC3823A and UC3823B outputs operate in phase with duty cycles from zero to less than 100%. The pin configuration of the UC3823A and UC3823B is the same as the UC3823 except pin 11 is now an output pin instead of the reference pin to the current limit comparator. "A" version parts have UVLO thresholds identical to the original UC3823 and UC3825. The "B" versions have UVLO thresholds of 16 V and 10 V, intended for ease of use in off-line applications.

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

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
UC2825ADWACTIVE-40 to 853.05 | 1kuSOIC (DW) | 16 View 40 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2825ADWG4ACTIVE-40 to 853.05 | 1kuSOIC (DW) | 16 View 40 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2825ADWTRACTIVE-40 to 852.90 | 1kuSOIC (DW) | 16 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2825ADWTRG4ACTIVE-40 to 852.90 | 1kuSOIC (DW) | 16 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2825ANACTIVE-40 to 853.05 | 1kuPDIP (N) | 16 View 25 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2825ANG4ACTIVE-40 to 853.05 | 1kuPDIP (N) | 16 View 25 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
UC2825AQACTIVE-40 to 853.60 | 1kuPLCC (FN) | 20 View 46 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC2825AQG3ACTIVE-40 to 853.60 | 1kuPLCC (FN) | 20 View 46 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples

* 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
TI Lead Time*: 20 WeeksUC2825ADW
AmericasArrow 488
Avnet 110
Newark 359
Rochester Electronics 50
AsiaFarnell Asia 64
WPI 57
EuropeAvnet-SILICA >1k
Compel 578
Farnell 64
WorldwideDigiKey 95
Mouser Electronics 120
TI Lead Time*: 20 WeeksUC2825ADWG4
AsiaFarnell Asia 30
EuropeFarnell 30
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC2825ADWTR
AmericasRochester Electronics >1k
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC2825ADWTRG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksUC2825AN
AmericasArrow 72
Newark 90
Rochester Electronics 654
AsiaFarnell Asia 90
WPI 42
TI Lead Time*: 20 WeeksUC2825ANG4
AsiaFarnell Asia 50
EuropeFarnell 40
TI Lead Time*: 16 WeeksUC2825AQ
AmericasRochester Electronics 9
TI Lead Time*: 16 WeeksUC2825AQG3
None Reported
View Distributors
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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
UC2825ADW RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC2825ADWG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC2825ADWTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC2825ADWTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
UC2825AN RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC2825ANG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU N/A for Pkg TypeViewView
UC2825AQ RoHS Compliant Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEARViewView
UC2825AQG3 RoHS Compliant Green (RoHS & no Sb/Br) CU SN 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 Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

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UC2825B High Speed PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.

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