ZHCSKA3D September 2019 – November 2023 UCC21750-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Pin Configuration and Functions
-
6 Specifications
- 6.1 Absolute Maximum Ratings
- 6.2 ESD Ratings
- 6.3 Recommended Operating Conditions
- 6.4 Thermal Information
- 6.5 Power Ratings
- 6.6 Insulation Specifications
- 6.7 Safety Limiting Values
- 6.8 Electrical Characteristics
- 6.9 Safety-Related Certifications
- 6.10 Switching Characteristics
- 6.11 Insulation Characteristics Curves
- 6.12 Typical Characteristics
- 7 Parameter Measurement Information
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Power Supply
- 8.3.2 Driver Stage
- 8.3.3 VCC and VDD Undervoltage Lockout (UVLO)
- 8.3.4 Active Pulldown
- 8.3.5 Short Circuit Clamping
- 8.3.6 Internal Active Miller Clamp
- 8.3.7 Desaturation (DESAT) Protection
- 8.3.8 Soft Turn-Off
- 8.3.9 Fault (FLT, Reset, and Enable (RST/EN)
- 8.3.10 Isolated Analog to PWM Signal Function
- 8.4 Device Functional Modes
-
9 Applications and Implementation
- 9.1 Application Information
- 9.2
Typical Application
- 9.2.1 Design Requirements
- 9.2.2
Detailed Design Procedure
- 9.2.2.1 Input Filters for IN+, IN–, and RST/EN
- 9.2.2.2 PWM Interlock of IN+ and IN–
- 9.2.2.3 FLT, RDY, and RST/EN Pin Circuitry
- 9.2.2.4 RST/EN Pin Control
- 9.2.2.5 Turn-On and Turn-Off Gate Resistors
- 9.2.2.6 Overcurrent and Short Circuit Protection
- 9.2.2.7 Isolated Analog Signal Sensing
- 9.2.2.8 Higher Output Current Using an External Current Buffer
- 9.2.3 Application Curves
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.3.8 Soft Turn-Off
The UCC21750-Q1 initiates a soft turn-off when the overcurrent and short circuit protection is triggered. When the overcurrent and short circuit fault happens, the IGBT transits from the active region to the desaturation region very fast. The channel current is controlled by the gate voltage and decreasing in a soft manner, thus the overshoot of the IGBT is limited and prevents the overvoltage breakdown. There is a tradeoff between the overshoot voltage and short circuit energy. The turn off speed must to be slow to limit the overshoot voltage, but the shutdown time must not be too long that the large energy dissipation can breakdown the device. The 400-mA soft turn-off current of the UCC21750-Q1 makes sure the power switches is safely turned off during short circuit events. The timing diagram of soft turn-off shows in Figure 7-10.
Figure 8-6 Soft Turn-Off