ZHCSM39F February   2005  – September 2020

PRODUCTION DATA  

  1. 1 信息
  2. 2 应用
  3. 3 说明
  4. 4 Functional Block Diagram
  5. 5 Absolute Maximum Ratings
  6. 6 Recommended Operating Conditions
  7. 7 LM4041x12I Electrical Characteristics
  8. 8 LM4041x12I Electrical Characteristics
  9. 9 LM4041x12Q Electrical Characteristics
  10. 10LM4041xI (Adjustable Version) Electrical Characteristics
  11. 11LM4041xI (Adjustable Version) Electrical Characteristics
  12. 12LM4041xQ (Adjustable Version) Electrical Characteristics
  13. 13Typical Characteristics
  14. 14Application Information
    1. 14.1 Output Capacitor
    2. 14.2 SOT-23 and SC-70 Pin Connections
    3. 14.3 Adjustable Version
    4. 14.4 Cathode and Load Currents
  15. 15Revision History
  16. 16Mechanical, Packaging, and Orderable Information

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14.4 Cathode and Load Currents

In a typical shunt regulator configuration (see Figure 14-4), an external resistor, RS, is connected between the supply and the cathode of the LM4041. RS must be set properly, as it sets the total current available to supply the load (IL) and bias the LM4041 (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 its maximum recommended rating of 12 mA.

RS is calculated as shown in Equation 1.

Equation 1. GUID-112DEC26-E723-408F-911A-326C41BB9590-low.gif
GUID-112B41FF-D5B4-4FAD-B03F-D4DC9EB919F5-low.gifFigure 14-4 Shunt Regulator