SLUSG57 July 2025 UCC21351-Q1
PRODUCTION DATA
- 1
- 1 Features
- 2 Applications
- 3 Description
- 4 Pin Configuration and Functions
-
5 Specifications
- 5.1 Absolute Maximum Ratings
- 5.2 ESD Ratings (Automotive)
- 5.3 Recommended Operating Conditions
- 5.4 Thermal Information
- 5.5 Power Ratings
- 5.6 Insulation Specifications
- 5.7 Safety Limiting Values
- 5.8 Electrical Characteristics
- 5.9 Switching Characteristics
- 5.10 Insulation Characteristics Curves
- 5.11 Typical Characteristics
- 6 Parameter Measurement Information
- 7 Detailed Description
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Designing INA/INB Input Filter
- 8.2.2.2 Select External Bootstrap Diode and its Series Resistor
- 8.2.2.3 Gate Driver Output Resistor
- 8.2.2.4 Gate to Source Resistor Selection
- 8.2.2.5 Estimate Gate Driver Power Loss
- 8.2.2.6 Estimating Junction Temperature
- 8.2.2.7 Selecting VCCI, VDDA/B Capacitor
- 8.2.2.8 Dead Time Setting Guidelines
- 8.2.2.9 Application Circuits with Output Stage Negative Bias
- 8.2.3 Application Curves
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
7.4.2.2 DT Pin Connected to a Programming Resistor Between DT and GND Pins
One can program tDT by placing a resistor, RDT, between the DT pin and GND. The appropriate RDT value can be determined from Equation 1, where RDT is in k? and tDT is in ns:
The DT pin current will be less than 10 μA when RDT = 100 kΩ. It is not recommended to leave the DT pin floating.
An input signal falling edge activates the programmed dead time for the other signal. The output signal dead time is always set to the longer of either the driver programmed dead time or the dead time of the input signal. If both inputs are high simultaneously, both outputs are immediately set low. This feature is used to prevent shoot-through, and it does not affect the programmed dead time setting for normal operation. Various driver dead time logic operating conditions are illustrated and explained in Section 7.3.2:
Figure 7-4 Input and
Output Logic Relationship with Input SignalsCondition A: INB goes low, INA goes high. INB sets OUTB low immediately and assigns the programmed dead time to OUTA. OUTA is allowed to go high after the programmed dead time.
Condition B: INB goes high, INA goes low. Now INA sets OUTA low immediately and assigns the programmed dead time to OUTB. OUTB is allowed to go high after the programmed dead time.
Condition C: INB goes low, INA is still low. INB sets OUTB low immediately and assigns the programmed dead time for OUTA. In this case, the input signal’s own dead time is longer than the programmed dead time. Thus, when INA goes high, it immediately sets OUTA high.
Condition D: INA goes low, INB is still low. INA sets OUTA low immediately and assigns the programmed dead time to OUTB. INB’s own dead time is longer than the programmed dead time. Thus, when INB goes high, it immediately sets OUTB high.
Condition E: INA goes high, while INB and OUTB are still high. To avoid shoot-through, INA immediately pulls OUTB low and keeps OUTA low. After some time OUTB goes low and assigns the programmed dead time to OUTA. OUTB is already low. After the programmed dead time, OUTA is allowed to go high.
Condition F: INB goes high, while INA and OUTA are still high. To avoid shoot-through, INB immediately pulls OUTA low and keeps OUTB low. After some time OUTA goes low and assigns the programmed dead time to OUTB. OUTA is already low. After the programmed dead time, OUTB is allowed to go high.