ZHCSHV4G October 2017 – December 2020 LM74700-Q1
PRODMIX
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Typical Characteristics
- 8 Parameter Measurement Information
- 9 Detailed Description
-
10Application and Implementation
- 10.1 Application Information
- 10.2 OR-ing Application Configuration
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
9.3.3 Gate Driver
The gate driver is used to control the external N-Channel MOSFET by setting the GATE to ANODE voltage to the corresponding mode of operation. There are three defined modes of operation that the gate driver operates under forward regulation, full conduction mode and reverse current protection, according to the ANODE to CATHODE voltage. Forward regulation mode, full conduction mode and reverse current protection mode are described in more detail in the Regulated conduction Mode, Full Conduction Mode and Reverse Current Production Mode sections. Figure 9-2 depicts how the modes of operation vary according to the ANODE to CATHODE voltage of the LM74700-Q1. The threshold between forward regulation mode and conduction mode is when the ANODE to CATHODE voltage is 50 mV. The threshold between forward regulation mode and reverse current protection mode is when the ANODE to CATHODE voltage is –11 mV.
Figure 9-2 Gate Driver Mode TransitionsBefore the gate driver is enabled following three conditions must be achieved:
- The EN pin voltage must be greater than the specified input high voltage.
- The VCAP to ANODE voltage must be greater than the undervoltage lockout voltage.
- The ANODE voltage must be greater than VANODE POR Rising threshold.