ZHCSSL6B July 2023 – March 2024 TPS7H6003-SP , TPS7H6013-SP , TPS7H6023-SP
PRODMIX
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Device Comparison Table
- 5 Device Options Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4 Device Functional Modes
- 9 Application and Implementation
- 10Device and Documentation Support
- 11Revision History
- 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 5 ns up to 100 ns. The resistor must be populated on both pins to operate the device in this mode.
Figure 8-4 Timing Waveforms in PWM Mode
Showing Dead TimeThe resistors required to program for desired dead times are calculated from Equation 8 and Equation 9:
where:
- TDHL is the desired "HO off to LO on" dead time in ns
- RHL is in kΩ
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.