SLOS588G June   2008  – May 2025

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 #GUID-CD5A394D-84DA-49EE-9F1D-C347D3339D1D/SLOS4567624
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 TL4050x20-Q1 Electrical Characteristics
    6. 5.6 TL4050x25-Q1 Electrical Characteristics
    7. 5.7 TL4050x41-Q1 Electrical Characteristics
    8. 5.8 TL4050x50-Q1 Electrical Characteristics
    9. 5.9 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Functional Block Diagram
  8. 7 Application Information
    1. 7.1 Output Capacitor
    2. 7.2 SOT-23-3 Pin Connections
    3. 7.3 Use With ADCs or DACs
    4. 7.4 Cathode and Load Currents
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
    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

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

7.4 Cathode and Load Currents

In a typical shunt-regulator configuration (see Figure 7-3), an external resistor, RS, connects between the supply and the cathode of the TL4050-Q1. Proper choice of RS is essential, as RS sets the total current available to supply the load (IL) and bias the TL4050-Q1 (IZ). In all cases, IZ must stay within a specified range for proper operation of the reference. Taking into consideration one extreme in the variation of the load and supply voltage (maximum IL and minimum VS), RS must be small enough to supply the minimum IZ required for operation of the regulator, as given by data-sheet parameters. At the other extreme, maximum VS and minimum IL, RS must be large enough to limit IZ to less than the maximum-rated value of 15mA.

Equation 1 calculates RS:

Equation 1. TL4050-Q1
TL4050-Q1 Shunt RegulatorFigure 7-3 Shunt Regulator