SLOS437R April   2004  – April 2024 TL103W , TL103WA , TL103WB

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics: OP AMP1 (VREF at Noninverting input)
    6. 5.6 Electrical Characteristics: OP AMP2 (Independent Amplifier)
    7. 5.7 Typical Characteristics: TL103WB
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Internal Reference
      2. 6.3.2 Input Common Mode Range
      3. 6.3.3 EMI Rejection
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Isolated Flyback CC/CV Feedback
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1 Constant Current Circuit
          2. 7.2.1.2.2 Constant Voltage Circuit
      2. 7.2.2 Constant Current Sink
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information
7.2.1.2.2 Constant Voltage Circuit

For the constant voltage feedback circuit, resistors R8 and R9 divide down the battery voltage to compare against the TL103Wx's reference. This is shown in Figure 7-2. The voltage at the inverting input of the amplifier is designed to equal 2.5V when the battery reaches its maximum specified voltage (or desired constant voltage value). This is shown in for a maximum voltage of 20V provided in Table 7-1.

Equation 7. V B A T × R 9 R 8 + R 9 = 2.5   V
Equation 8. 20   V × R 9 R 8 + R 9 = 2.5   V
To mimic the constant current circuit and achieve a total impedance and 2kΩ across the battery, R8 is set to 1.96kΩ and R9 to 280Ω.
GUID-20230918-SS0I-PSLM-QLBL-BWNMSFGHDVR5-low.svg Figure 7-2 Constant Voltage Circuit