SLUSEV9A August   2023  – September 2023 UCC14340-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Insulation Specifications
    6. 7.6 Safety-Related Certifications
    7. 7.7 Electrical Characteristics
    8. 7.8 Safety Limiting Values
    9. 7.9 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Power Stage Operation
        1. 8.3.1.1 VDD-VEE Voltage Regulation
        2. 8.3.1.2 COM-VEE Voltage Regulation
        3. 8.3.1.3 Power Handling Capability
      2. 8.3.2 Output Voltage Soft Start
      3. 8.3.3 ENA and PG
      4. 8.3.4 Protection Functions
        1. 8.3.4.1 Input Undervoltage Lockout
        2. 8.3.4.2 Input Overvoltage Lockout
        3. 8.3.4.3 Output Undervoltage Protection
        4. 8.3.4.4 Output Overvoltage Protection
        5. 8.3.4.5 Overpower Protection
        6. 8.3.4.6 Overtemperature Protection
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Capacitor Selection
        2. 9.2.2.2 Single RLIM Resistor Selection
        3. 9.2.2.3 RDR Circuit Component Selection
        4. 9.2.2.4 Feedback Resistors Selection
  11. 10System Examples
  12. 11Power Supply Recommendations
  13. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  14. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Support Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  15. 14Mechanical, Packaging, and Orderable Information
  16. 15Tape and Reel Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.2.2.4 Feedback Resistors Selection

VVDD-VEE Regulation

The VVDD-VEE output voltage is regulated by sensing with a feedback resistor divider, where a resistor from VDD to VEE (RFBVDD_VDD) and a resistor from COM to VEE (RFBVDD_VEE) are used so that FBVDD = 2.5V

Use 0.1% resistors for the highest accuracy. External resistor divider will help to cancel the temperature coefficient of the resistors. We can set resistor RFBVDD_VEE = 10k ohm, then calculate for resistor RFBVDD_VDD using the following equation.

Equation 19. RFBVDD_VDD=VVDD-VEE-VFBVEE×RFBVDD_VEEVFBVDD

A 330pF ceramic capacitor, CFBVDD, must be connected from FBVDD to VEE to filter high frequency switching noise. This capacitor should be in parallel to the RFBVDD_VEE resistor.

VVCOM-VEE Regulation

Similarly, in dual output applications, the VCOM-VEE voltage can be regulated by sensing the output voltage with a resistor divider; however there are three different feedback resistor configurations depending on whether regulation voltage desired is greater-than 2.5V, or equal-to 2.5V, or less-than 2.5V. For all three configurations, a 330pF ceramic capacitor must be connected from FBVEE to VEE to filter high frequency switching noise.

VVCOM-VEE > 2.5V: When the VCOM-VEE regulation voltage is greater-than 2.5V, the resistors RFBVEE_COM and RFBVEE_VEE are connected as shown in figure below (Dual output application schematic configured for VCOM_VEE regulation > 2.5V) between COM and VEE. Letting RFBVEE_COM = 10k ohms, we can calculate RFBVEE_VEE with the following equation.

Equation 20. R F B V E E _ C O M = V C O M - V E E - V F B V E E × R F B V E E _ V E E V F B V E E

Connect a 330pF ceramic capacitor, CFBVEE, from FBVEE to VEE for filtering high frequency switching noise.

VVCOM-VEE = 2.5V: When the VCOM-VEE regulation voltage is equal-to 2.5V, only a single resistor, RFBVEE_COM is needed connected from COM to FBVEE as shown in figure below (Dual output application schematic configured for VCOM_VEE regulation = 2.5V). Select RFBVEE_COM = 10k ohms. This sets the corner frequency for the high frequency filter with the 330pF capacitor, CFBVEE, connected from FBVEE to VEE.

VVCOM-VEE < 2.5V: When the VCOM-VEE regulation voltage is less-than 2.5V, the resistors RFBVEE_COM and RFBVEE_VDD are connected as shown in figure below (Dual output application schematic configured for VCOM_VEE regulation > 2.5V) between VDD and COM. Letting RFBVEE_COM = 10k ohms, we can calculate RFBVEE_VDD with the following equation.

Equation 21. R F B V E E _ C O M = V F B V E E - V C O M - V E E × R F B V E E _ V D D V V D D - V E E - V F B V E E

Connect a 330pF ceramic capacitor, CFBVEE, from FBVEE to VEE to filter high frequency switching noise.

GUID-20230818-SS0I-0KR4-8GDJ-HWWTHD8D0RVP-low.jpgFigure 9-8 Dual output application schematic configured for VCOM_VEE regulation > 2.5V
GUID-20230818-SS0I-CHNK-2BL5-F7S91PHWZVG8-low.pngFigure 9-9 Dual output application schematic configured for VCOM_VEE regulation = 2.5V
GUID-20230818-SS0I-SVM3-PVHR-SN7MPTB7BQQG-low.jpgFigure 9-10 Dual output application schematic configured for VCOM_VEE regulation < 2.5V