ZHCSHQ7B February 2018 – April 2024 UCC21222-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 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 Custom Design With WEBENCH? Tools
- 8.2.2.2 Designing INA/INB Input Filter
- 8.2.2.3 Select Dead Time Resistor and Capacitor
- 8.2.2.4 Select External Bootstrap Diode and its Series Resistor
- 8.2.2.5 Gate Driver Output Resistor
- 8.2.2.6 Estimating Gate Driver Power Loss
- 8.2.2.7 Estimating Junction Temperature
- 8.2.2.8 Selecting VCCI, VDDA/B Capacitor
- 8.2.2.9 Application Circuits with Output Stage Negative Bias
- 8.2.3 Application Curves
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Revision History
- 13Mechanical, Packaging, and Orderable Information
7.4.2.2 Connecting a Programming Resistor between DT and GND Pins
Program tDT by placing a resistor, RDT, between the DT pin and GND. The appropriate RDT value can be determined, where RDT is in k? and tDT is in ns:
where
- tDT is the programmed dead time, in nanoseconds.
- RDT is the value of resistance between DT pin and GND, in kilo-ohms.
tDT is true when RDT is in the range of 1.7 k? to 100 k?. It is not recommended to use a RDT with value greater than 100 k?.
An input signal’s falling edge activates the programmed dead time for the other signal. The output signals’ dead time is always set to the longer of either the driver’s programmed dead time or the input signal’s own dead time. If both inputs are high simultaneously, both outputs will immediately be 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 Figure 7-4.
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 dead time is longer than the programmed dead time. When INA goes high after the duration of the input signal dead time, 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. In this case, the input signal dead time is longer than the programmed dead time. When INB goes high after the duration of the input signal dead time, it immediately sets OUTB high.
Condition E: INA goes high, while INB and OUTB are still high. To avoid overshoot, OUTB is immediately pulled 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 overshoot, OUTA is immediately pulled 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.