ZHCSSM8 july   2023 UCC27444

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Timing Diagrams
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Operating Supply Current
      2. 7.3.2 Input Stage
      3. 7.3.3 Enable Function
      4. 7.3.4 Output Stage
      5. 7.3.5 Low Propagation Delays and Tightly Matched Outputs
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 VDD and Power On Reset
        2. 8.2.2.2 Drive Current and Power Dissipation
      3. 8.2.3 Application Curves
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  12. 11Device and Documentation Support
    1. 11.1 第三方产品免责声明
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 静电放电警告
    6. 11.6 术语表
  13. 12Mechanical, Packaging, and Orderable Information

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7.1 Overview

The UCC27444 device is the dual-channel, low-side, high-speed, gate driver devices featuring 4-A source and sink current capability, fast switching characteristics, and a host of other features. UCC27444 Features and Benefits details the advantages of the gate driver's features, which combine to ensure efficient, robust, and reliable operation in high-frequency switching power circuits. The robust inputs of UCC27444 can handle –5 V, ensuring reliable operation in noisy environments. The driver has good transient handling capability on its output due to its reverse current handling, as well as rail-to-rail output drive, and a small propagation delay (typically 18 ns). With this built-in robustness, the UCC27444 device can also be directly connected to a gate drive transformer.

The input threshold of UCC27444 is compatible with TTL low-voltage logic, which is fixed and independent of VDD supply voltage. The driver can also work with CMOS-based controllers as long as the threshold requirement is met.

Each channel has an enable pin, ENx, with a fixed TTL compatible threshold. The ENx pins are internally pulled up. Pulling ENx low disables the corresponding channel, while leaving ENx open provides normal operation. The ENx pins can be used as an additional input with the same performance as the INx pins.

Table 7-1 UCC27444 Features and Benefits
FEATURE BENEFIT
–5-V IN capability Enhanced signal reliability and device robustness in noisy environments that experience ground bounce on the gate driver
18-ns (typical) propagation delay Extremely fast control to power device response times.
1-ns (typical) delay matching between channels Ease of optimizing timing of power device switching such as selecting dead time.
VDD POR protection Outputs are held low in power on reset conditions, which ensures predictable, glitch-free operation at power-up and power-down.
Outputs are enabled when enable pins (ENx) are in floating condition. Pin-to-pin compatibility with legacy devices from Texas Instruments in designs where Pin 1 and Pin 8 are "No Connect" pins