SLVSHE3 June   2024 DRV2911-Q1

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 Auto
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Output Stage
      2. 6.3.2 Hardware Interface
      3. 6.3.3 AVDD Linear Voltage Regulator
      4. 6.3.4 Step-Down Mixed-Mode Buck Regulator
        1. 6.3.4.1 Buck in Inductor Mode
        2. 6.3.4.2 Buck in Resistor mode
        3. 6.3.4.3 Buck Regulator with External LDO
        4. 6.3.4.4 AVDD Power Sequencing with Buck Regulator
        5. 6.3.4.5 Mixed mode Buck Operation and Control
        6. 6.3.4.6 Buck Undervoltage Lockout
        7. 6.3.4.7 Buck Overcurrent Protection
      5. 6.3.5 Charge Pump
      6. 6.3.6 Slew Rate Control
      7. 6.3.7 Cross Conduction (Dead Time)
      8. 6.3.8 Propagation Delay
      9. 6.3.9 Protections
        1. 6.3.9.1 PVDD Supply Undervoltage Lockout
        2. 6.3.9.2 AVDD Undervoltage Lockout
        3. 6.3.9.3 VCP Charge Pump Undervoltage Lockout
        4. 6.3.9.4 Overcurrent Latched Protection
        5. 6.3.9.5 Thermal Shutdown (OTSD)
          1. 6.3.9.5.1 OTSD FET
          2. 6.3.9.5.2 OTSD (Non-FET)
    4. 6.4 Device Functional Modes
      1. 6.4.1 Functional Modes
        1. 6.4.1.1 Reset Mode
        2. 6.4.1.2 Operating Mode
        3. 6.4.1.3 Fault Reset (RESETZ Pulse)
      2. 6.4.2 OUTOFF functionality
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Design Procedure
      2. 7.2.2 Voltage and Current Sense Circuitry
  9. 8 Power Supply Recommendations
    1. 8.1 Bulk Capacitance
  10. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
    3. 9.3 Thermal Considerations
      1. 9.3.1 Power Dissipation
  11. 10Device and Documentation Support
    1. 10.1 Third-Party Products Disclaimer
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information

Package Options

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

7.2.2 Voltage and Current Sense Circuitry

Each input into the ULC1001-Q1 current and voltage sense amplifiers require a voltage divider to decrease the high voltage across the transducer from 0V to 0.9V. The circuit representation of the current and voltage sense amplifiers is shown in Figure 7-3, where the items in I-sense Amp and V-sense Amp are internal to ULC1001-Q1. The resistors used in the voltage dividers must have a 0.1% tolerance to achieve high accuracy for power measurements. Three scale factors, USER_Params_ohms_sf_Q22, USER_Params_watts_sf_Q18, and USER_Params_Imag_max_sf_Q27, are used to convert the measured values into power, impedance, and current values, respectively. Use the below equation to determine the scale factors and the current and voltage sense amplifier gains. Table 7-1 containing typical resistor values for common voltage levels.

Note: The equivalent resistance between VDD and GND must be ≥ 4kΩ. RF is fixed to 84kΩ.

DRV2911-Q1 Voltage and Current Sense Amplifiers
Figure 7-3 Voltage and Current Sense Amplifiers
Equation 5. U S E R _ P a r a m s _ o h m s _ s f _ Q 22 = I S N S G A I N V S N S G A I N
Equation 6. U S E R _ P a r a m s _ w a t t s _ s f _ Q 18 = 1 V S N S G A I N ✕ 1 I S N S G A I N ✕ 0.2025
Equation 7. U S E R _ P a r a m s _ I m a g _ m a x _ s f _ Q 27 =   0.9 I S N S G A I N
Equation 8. I S N S G A I N ( V A ) = R f   ✕   R S N S R 4
Equation 9. V S N S G A I N ( V V ) = 1.043 ✕ R f R 1 ✕ R 3 ✕ ( 1 R 1 + 1 R 2 + 1 R 3 )
Table 7-1 Voltage and Current Sense Resistor Reference Values R5 = 6kΩ. R6 = 2kΩ
Differential Voltage (pk-pk) R1 R2 R3 R4
460 1.3MΩ 6.34kΩ 294kΩ 422kΩ
90 360kΩ 30kΩ 1MΩ 150kΩ
40 150kΩ 30kΩ 1MΩ 150kΩ