UCC2808ADTR-2 by Texas Instruments | Current Mode PWM Controllers | Avnet ASIA
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UCC2808ADTR-2

Texas Instruments

Current Mode PWM Controller 1A 8-Pin SOIC T/R

Manufacturer Part #: UCC2808ADTR-2

Alternate Part #: UCC2808ADTR-2


RoHS Compliant

Descriptions

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Information

The UCC3808A is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The UCC3808A contains all of the control and drive circuitry required for off-line or dc-to-dc fixed frequency current-mode switching power supplies with minimal external parts count.

The UCC3808A dual output drive stages are arranged in a push-pull configuration. Both outputs switch at half the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 60 ns to 200 ns depending on the values of the timing capacitor and resistors, thus limiting each output stage duty cycle to less than 50%.

The UCC3808A family offers a variety of package options, temperature range options, and choice of undervoltage lockout levels. The family has UVLO thresholds and hysteresis options for off-line and battery powered systems. Thresholds are shown in the table below.

The UCC3808A is an enhanced version of the UCC3808 family. The significant difference is that the A versions feature an internal discharge transistor from the CS pin to ground, which is activated each clock cycle during the oscillator dead time. The feature discharges any filter capacitance on the CS pin during each cycle and helps minimize filter capacitor values and current sense delay.

Key Features

  • Dual Output Drive Stages in Push-Pull Configuration
  • Current Sense Discharge Transistor to Improve Dynamic Response
  • 130-µA Typical Starting Current
  • 1-mA Typical Run Current
  • Operation to 1 MHz
  • Internal Soft Start
  • On-Chip Error Amplifier With 2-MHz Gain Bandwidth Product
  • On Chip VDD Clamping
  • Output Drive Stages Capable of 500-mA Peak-Source Current, 1-A Peak-Sink Current
  • Technical Attributes

    Description
    Value
    Find similar Parts
    Output Current
    1000 mA
    Number of PWM Outputs
    2
    Product Dimensions
    5 x 4 x 1.5 mm
    Pin Count
    8
    Rise Time
    25 ns
    On/Off Pin
    No
    Maximum Duty Cycle
    50 %
    Supplier Package
    SOIC
    Mounting
    Surface Mount
    Max Processing Temp
    260
    Adjustable Output
    No
    Operating Temperature
    -40 to 85 °C
    Fall Time
    25 ns
    Switching Frequency
    1000 kHz
    Lead Finish
    Gold
    MSL Level
    1

    ECCN / UNSPSC

    Description
    Value
    ECCN:
    EAR99
    SCHEDULE B:
    8542390000"
    UNSPSC:
    32101600
    UNSPSC VERSION:
    V15.1101
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