SBOSA18C may   2020  – june 2023 TSV911A-Q1 , TSV912A-Q1 , TSV914A-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison Table
  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: TSV911A-Q1
    5. 7.5 Thermal Information: TSV912A-Q1
    6. 7.6 Thermal Information: TSV914A-Q1
    7. 7.7 Electrical Characteristics
    8. 7.8 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 Rail-to-Rail Input
      2. 8.3.2 Rail-to-Rail Output
      3. 8.3.3 Overload Recovery
    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
      3. 9.2.3 Application Curve
    3. 9.3 Power Supply Recommendations
      1. 9.3.1 Input and ESD Protection
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.2 Detailed Design Procedure

The transfer function of the circuit in Figure 9-1 is shown in Equation 1.

Equation 1. V O U T =   I L O A D     ×   R S H U N T   ×   G a i n

The load current (ILOAD) produces a voltage drop across the shunt resistor (RSHUNT). The load current is set from 0 A to 1 A. To keep the shunt voltage below 100 mV at maximum load current, the largest shunt resistor is defined using Equation 2.

Equation 2. R S H U N T =   V S H U N T _ M A X I L O A D _ M A X   =   100   m V 1   A   =   100   m Ω

Using Equation 2, RSHUNT is 100 mΩ. The voltage drop produced by ILOAD and RSHUNT is amplified by the TSV91xA-Q1 to produce an output voltage of approximately 0 V to 4.95 V. The gain required by the TSV91xA-Q1 to produce the necessary output voltage is calculated using Equation 3:

Equation 3. G a i n =   V O U T _ M A X - V O U T _ M I N V I N _ M A X     - V I N _ M I N

Using Equation 3, the required gain is calculated to be 49.5 V/V, which is set with resistors RF and RG. Equation 4 is used to size the resistors, RF and RG, to set the gain of the TSV91xA-Q1 to 49.5 V/V.

Equation 4. G a i n   =   1   +   R F R G

Selecting RF as 165 kΩ and RG as 3.4 kΩ provides a combination that equals roughly 49.5 V/V. Figure 9-2 shows the measured transfer function of the circuit shown in Figure 9-1.