ZHCSG45B March   2017  – March 2018 LM5113-Q1

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      简化应用示意图
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 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 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input and Output
      2. 7.3.2 Start-Up and UVLO
      3. 7.3.3 HS Negative Voltage and Bootstrap Supply Voltage Clamping
      4. 7.3.4 Level Shift
    4. 7.4 Device Functional Modes
  8. 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 Bypass Capacitor
        2. 8.2.2.2 Bootstrap Capacitor
        3. 8.2.2.3 Power Dissipation
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 文档支持
      1. 11.1.1 相关文档
    2. 11.2 接收文档更新通知
    3. 11.3 社区资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 Glossary
  12. 12机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

7.3.2 Start-Up and UVLO

The LM5113-Q1 has an undervoltage lockout (UVLO) on both the VDD and bootstrap supplies. When the VDD voltage is below the threshold voltage of 3.8 V, both the HI and LI inputs are ignored to prevent the GaN FETs from being partially turned on. Also, if there is insufficient VDD voltage, the UVLO actively pulls the LOL and HOL low. When the VDD voltage is above its UVLO threshold, but the HB to HS bootstrap voltage is below the UVLO threshold of 3.2 V, only HOL is pulled low. Both UVLO threshold voltages have 200 mV of hysteresis to avoid chattering.

The startup voltage sequencing for this device is as follows: VDD voltage first, with the VIN voltage present thereafter.

The LM5113-Q1 requires an external bootstrap diode with a 100 Ω series resistor from VDD to HB to charge the high side supply on a cycle by cycle basis. The recommended bootstrap diode options are BAT46, BAT41, or LL4148.

Table 1. VDD UVLO Feature Logic Operation

CONDITION (VHB-HS> VHBR for all cases below) HI LI HO LO
VDD – VSS< VDDR during device start-up H L L L
VDD – VSS< VDDR during device start-up L H L L
VDD – VSS< VDDR during device start-up H H L L
VDD – VSS< VDDR during device start-up L L L L
VDD – VSS< VDDR – VDDH after device start-up H L L L
VDD – VSS< VDDR – VDDH after device start-up L H L L
VDD – VSS< VDDR – VDDH after device start-up H H L L
VDD – VSS< VDDR – VDDH after device start-up L L L L

Table 2. VHB-HS UVLO Feature Logic Operation

CONDITION (VDD> VDDR for all cases below) HI LI HO LO
VHB-HS< VHBR during device start-up H L L L
VHB-HS< VHBR during device start-up L H L H
VHB-HS< VHBR during device start-up H H L H
VHB-HS< VHBR during device start-up L L L L
VHB-HS< VHBR – VHBH after device start-up H L L L
VHB-HS< VHBR – VHBH after device start-up L H L H
VHB-HS< VHBR – VHBH after device start-up H H L H
VHB-HS< VHBR – VHBH after device start-up L L L L