SLUS395K February   2000  – October 2015 UCC2817 , UCC2818 , UCC3817 , UCC3818

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Reference Section and Error Amplifier
      2. 7.3.2 Zero Power Block
      3. 7.3.3 Multiplier
      4. 7.3.4 Output Overvoltage Protection
      5. 7.3.5 Pin Descriptions
        1. 7.3.5.1  CAI
        2. 7.3.5.2  CAOUT
        3. 7.3.5.3  CT
        4. 7.3.5.4  DRVOUT
        5. 7.3.5.5  GND
        6. 7.3.5.6  IAC
        7. 7.3.5.7  MOUT
        8. 7.3.5.8  OVP/EN
        9. 7.3.5.9  PKLMT
        10. 7.3.5.10 RT
        11. 7.3.5.11 SS
        12. 7.3.5.12 VAOUT
        13. 7.3.5.13 VCC
        14. 7.3.5.14 VFF
        15. 7.3.5.15 VSENSE
        16. 7.3.5.16 VREF
    4. 7.4 Device Functional Modes
      1. 7.4.1 Transition Mode Control
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Power Stage
          1. 8.2.2.1.1 LBOOST
          2. 8.2.2.1.2 COUT
        2. 8.2.2.2 Softstart
        3. 8.2.2.3 Multiplier
        4. 8.2.2.4 Voltage Loop
        5. 8.2.2.5 Current Loop
        6. 8.2.2.6 Start Up
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Power Switch Selection
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Capacitor Ripple Reduction
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Related Links
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DW|16
  • N|16
  • D|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Controls Boost Preregulator to Near-Unity Power Factor
  • Limits Line Distortion
  • World Wide Line Operation
  • Over-Voltage Protection
  • Accurate Power Limiting
  • Average Current Mode Control
  • Improved Noise Immunity
  • Improved Feed-Forward Line Regulation
  • Leading Edge Modulation
  • 150-μA Typical Start-Up Current
  • Low-Power BiCMOS Operation
  • Up to 18-V Operation
  • Frequency Range 6 kHz to 220 kHz

2 Applications

  • PC Power
  • Consumer Electronics
  • Lighting
  • Industrial Power Supplies
  • IEC6100-3-2 Compliant Supplies Less Than
    300 W

3 Description

The UCCx817 and UCCx818 family provides all the functions necessary for active power factor-corrected preregulators. The controller achieves near-unity power factor by shaping the AC input line current waveform to correspond to that of the AC input line voltage. Average current mode control maintains stable, low distortion sinusoidal line current.

Designed in Texas Instrument’s BiCMOS process, the UCCx817 and UCCx818 offers new features such as lower start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge modulation technique to reduce ripple current in the bulk capacitor, and an improved, low-offset (±2-mV) current amplifier to reduce distortion at light load conditions.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
UCC2817, UCC2818, UCC3817, UCC3818 SOIC (16) 3.91 mm × 9.9 mm
7.5 mm × 10.3 mm
PDIP (16) 6.35 mm × 19.3 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Block Diagram

UCC2817 UCC2818 UCC3817 UCC3818 fbd_lus395.gif