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UC1825A Status: ACTIVE

High Speed PWM Controller


      
         
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 UC1825AUC2825A UC3825A 
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 UC1825A

Version Part Number Definition
Catalog UC3825A TI's standard catalog product
Space UC1825A-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application

Customers Who Evaluated This Product Also Evaluated

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)DSCC #Price | QuantityPackage | PinsPackage QTY | Package CarrierSymbolsFootprintsSamples
5962-87681022AACTIVE-55 to 125 23.13 | 100uLCCC (FK) | 20 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
5962-8768102EAACTIVE-55 to 125 17.98 | 100uCDIP (J) | 16 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
UC1825AJACTIVE-55 to 125 12.19 | 100uCDIP (J) | 16 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1825AJ883BACTIVE-55 to 1255962-8768102EA17.98 | 100uCDIP (J) | 16 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1825ALACTIVE-55 to 125 18.29 | 100uLCCC (FK) | 20 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1825AL883BACTIVE-55 to 1255962-87681022A23.13 | 100uLCCC (FK) | 20 1 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
UC1825ALP883BOBSOLETE-55 to 125  (LP) | 28    Not Available

* 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 9:51 AM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 Weeks5962-87681022A
None Reported
View Distributors
TI Lead Time*: 8 Weeks5962-8768102EA
AmericasRochester Electronics 117
TI Lead Time*: 20 WeeksUC1825AJ
AmericasArrow 370
Avnet 139
EuropeAbacus Polar 70
TI Lead Time*: 8 WeeksUC1825AJ883B
AmericasArrow 113
EuropeEBV Elektronik 11
TI Lead Time*: 20 WeeksUC1825AL
None Reported
View Distributors
TI Lead Time*: 20 WeeksUC1825AL883B
None Reported
View Distributors
TI Lead Time*: 8 WeeksUC1825ALP883B
None Reported
View Distributors
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
5962-87681022A  TBD POST-PLATE N/A for Pkg TypeViewView
5962-8768102EA  TBD A42  N/A for Pkg TypeViewView
UC1825AJ  TBD A42  N/A for Pkg TypeViewView
UC1825AJ883B  TBD A42  N/A for Pkg TypeViewView
UC1825AL  TBD POST-PLATE N/A for Pkg TypeViewView
UC1825AL883B  TBD POST-PLATE N/A for Pkg TypeViewView
UC1825ALP883B  TBD Call TI 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 UC1825A Help

Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UC1825 High Speed PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC1825-SP High Speed PWM Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UC1825A-SP 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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