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UCC3809 Status: ACTIVE

Economy Primary Side Controller Family


      
         
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Special Note

You can program this part for 90% Maximum Duty Cycle for frequencies of 250kHz or less with added components, per SLUA251


Datasheet

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 UCC2809-1 UCC2809-2 UCC3809-1 UCC3809-2 
TopologyBoost, Flyback, Forward  Boost, Flyback, Forward  Boost, Buck, Flyback, Forward  Boost, Buck, Flyback, Forward  
Control MethodCurrent Mode  Current Mode  Current Mode  Current Mode  
Duty Cycle(Max)(%)70  70  70  70  
PWM Outputs(#)1  1  1  1  
Frequency(Max)(kHz)1000  1000  1000  1000  
UVLO Thresholds On/Off(V)10/8  15/8  10/8  15/8  
Pin/Package8MSOP, 8SOIC, 8TSSOP  8MSOP, 8SOIC, 8TSSOP  8MSOP, 8PDIP, 8SOIC, 8TSSOP  8MSOP, 8PDIP, 8SOIC, 8TSSOP  
Regulated Outputs(#)1  1  1  1  
Thermal ShutdownNo  No  No  No  
 SamplesSamplesSamplesSamples
 InventoryInventoryInventoryInventory

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Product Information

Features

  • User Programmable Soft Start With Active Low Shutdown
  • User Programmable Maximum Duty Cycle
  • Accessible 5V Reference
  • Undervoltage Lockout
  • Operation to 1MHz
  • 0.4A Source/0.8A Sink FET Driver
  • Low 100µA Startup Current

Description

The UCC3809 family of BCDMOS economy low power integrated circuits contains all the control and drive circuitry required for off-line and isolated DC-to-DC fixed frequency current mode switching power supplies with minimal external parts count. Internally implemented circuits include undervoltage lockout featuring startup current less than 100µA, a user accessible voltage reference, logic to ensure latched operation, a PWM comparator, and a totem pole output stage to sink or source peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.

Oscillator frequency and maximum duty cycle are programmed with two resistors and a capacitor. The UCC3809 family also features full cycle soft start.

The family has UVLO thresholds and hysteresis levels for off-line and DC-to-DC systems as shown in the table to the left.

The UCC3809 and the UCC2809 are offered in the 8 pin SOIC (D), PDIP (N), TSSOP (PW), and MSOP (P) packages. The small TSSOP and MSOP packages make the device ideal for applications where board space and height are at a premium.

    

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Technical Documents

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Datasheet

Application Notes

View Application Notes for PWM Power Supply Controllers

User Guides

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More Literature

Reference Designs

Description Part # Company
12V, 1A Isolated PoE PD Power Supply Reference Design PMP940 Texas Instruments
19 Watt AC Input LED Driver Reference Design PMP3155 Texas Instruments
Isolated, Low Cost, Non-Synchronous PoE PD Power Supply Reference Design PMP717 Texas Instruments
Isolated, Synchronous Flyback, 3.3V @ 3A or 5V @ 2A PoE PD Power Supply Reference Design PMP929 Texas Instruments

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
UCC28810 LED Lighting Power Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UCC3809-1 Economy Primary Side Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
UCC28600 8-Pin Quasi Resonant Flyback Green Mode Controller AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS TI customers also evaluated this product.
TPS2375 IEEE 802.3af PoE Powered Device Controllers POWER OVER ETHERNET/LAN SOLUTIONS-POWERED DEVICES TI customers also evaluated this product.
TPS61165 High Brightness White LED Driver in 2mm x 2mm QFN Package LIGHTING AND DISPLAY SOLUTIONS-WHITE LED DRIVERS TI customers also evaluated this product.
TPS61500 High Brightness LED Driver with Integrated 3-A, 40-V Power Switch LIGHTING AND DISPLAY SOLUTIONS-WHITE LED DRIVERS TI customers also evaluated this product.

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