SNOSDH4C June   2024  – April 2025 TPS7H6005-SEP , TPS7H6005-SP , TPS7H6015-SEP , TPS7H6015-SP , TPS7H6025-SEP , TPS7H6025-SP

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Device Options 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
    5. 7.5 Electrical Characteristics
    6. 7.6 Switching Characteristics
    7. 7.7 Quality Conformance Inspection
    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  Input Voltage
      2. 8.3.2  Linear Regulator Operation
      3. 8.3.3  Bootstrap Operation
        1. 8.3.3.1 Bootstrap Charging
        2. 8.3.3.2 Bootstrap Capacitor
        3. 8.3.3.3 Bootstrap Diode
        4. 8.3.3.4 Bootstrap Resistor
      4. 8.3.4  High-Side Driver Startup
      5. 8.3.5  Inputs and Outputs
      6. 8.3.6  Dead Time
      7. 8.3.7  Input Interlock Protection
      8. 8.3.8  Undervoltage Lockout and Power Good (PGOOD)
      9. 8.3.9  Negative SW Voltage Transients
      10. 8.3.10 Level Shifter
    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
        1. 9.2.2.1 Bootstrap and Bypass Capacitors
        2. 9.2.2.2 Bootstrap Diode
        3. 9.2.2.3 BP5x Overshoot and Undershoot
        4. 9.2.2.4 Gate Resistor
        5. 9.2.2.5 Dead Time Resistor
        6. 9.2.2.6 Gate Driver Losses
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Examples
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

8.3.6 Dead Time

When operating in PWM mode, resistors to AGND are required on both DLH and DHL to program the dead time. The DHL resistor sets the dead time between high-side output (HO) turn-off to low-side (LO) output turn-on. Likewise, the resistor on DLH sets the dead-time between low-side (LO) turn-off to high-side (HO) turn-on. The resistor can be used to set the dead time from a minimum value of roughly 5ns up to 100ns. The resistor must be populated on both pins to operate the device in this mode.

TPS7H6005-SP TPS7H6015-SP TPS7H6025-SP TPS7H6005-SEP TPS7H6015-SEP TPS7H6025-SEP Timing Waveforms in PWM Mode Showing Dead TimeFigure 8-4 Timing Waveforms in PWM Mode Showing Dead Time

The resistors required to program for a desired dead times are calculated from

Equation 8. RHL=1.077×TDHL+1.812

where:

  • TDHL is the desired "HO off to LO on" dead time in ns
  • RHL is in kΩ

Equation 9. RLH=1.064×TDLH-0.630

where:

  • TDLH is the desired "LO off to HO on" dead time in ns
  • RLH is in kΩ

Carefully select dead time to prevent cross-conduction between the high-side and low-side switches, while also minimizing losses during this period. The resistors selected for RHL and RLH are recommended to have a tolerance of 1% or better.