TIDUF43 August   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Terminology
    2. 1.2 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 TPS1213-Q1 45V, Low IQ, Automotive High-Side Switch Controller With Low-Power Mode and Adjustable Load Wakeup Trigger
      2. 2.3.2 INA296x-Q1 AEC-Q100, –5V to 110V, Bidirectional, 1.1MHz, 8V/μs, Ultra-Precise Current-Sense Amplifier
  9. 3System Design Theory
    1. 3.1 Low-Power Mode Considerations
    2. 3.2 Precharge Circuit Considerations
    3. 3.3 Short-Circuit Protection
    4. 3.4 LM74704-Q1 Enable
    5. 3.5 Headers
      1. 3.5.1 Headers for Configuring INA296B-Q1
      2. 3.5.2 Headers for Configuring TPS1213-Q1
    6. 3.6 Software Considerations
      1. 3.6.1 Fuse Channel Definition
      2. 3.6.2 Software Functions
    7. 3.7 Optional Output TVS Diode
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software
    3. 4.3 Test Setup
    4. 4.4 Test Results
      1. 4.4.1 State Transition
      2. 4.4.2 System IQ in Low-Power Mode
      3. 4.4.3 Precharge Test
      4. 4.4.4 Overcurrent Protection
      5. 4.4.5 PWM Overcurrent
      6. 4.4.6 Short-Circuit Protection
      7. 4.4.7 Thermal Testing
      8. 4.4.8 CISPR-25 Emissions Testing
        1. 4.4.8.1 Conducted Emissions Testing
        2. 4.4.8.2 Radiated Emissions Testing
        3. 4.4.8.3 Summary of Results
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout Recommendations
        1. 5.1.3.1 Layout Prints
      4. 5.1.4 Altium Project
      5. 5.1.5 Gerber Files
      6. 5.1.6 Assembly Drawings
    2. 5.2 Documentation Support
    3. 5.3 Support Resources
    4. 5.4 Trademarks
  12. 6About the Author

3.5.1 Headers for Configuring INA296B-Q1

J3 and J4 both set the reference voltages of the INA296B-Q1. Therefore, the jumpers can be set according to Table 3-2 for different current-sense configurations. Figure 3-3 shows the INA296B-Q1 schematic.

TIDA-020065 INA296B-Q1 Schematic Figure 3-3 INA296B-Q1 Schematic
Table 3-2 INA296B-Q1 Configuration
J3 SETTING (VREF1) J4 SETTING (VREF2) CONFIGURATION
GND GND Unidirectional current sensing (0A to 66A)
GND 3V3 Bidirectional current sensing (–33A to 33A)
3V3 GND Bidirectional current sensing (–33A to 33A)
3V3 3V3 Unidirectional reverse current sensing (–66A to 0A)
Equation 9. VOUT,INA=GVIN+-VIN–+VREF1+VREF22

where

  • VOUT,INA is the current sense output
  • VIN+ – VIN– is the voltage drop across the shunt resistor R14
  • G is the gain of the current sense amplifier (G = 50)
Note: TIDA-020065 software does not have any special logic for reverse-current monitoring. The software-based I2t algorithm operates correctly only for the forward-current option.