ZHCSQT8 October 2023 LM74930-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Charge Pump
- 7.3.2 Dual Gate Control (DGATE, HGATE)
- 7.3.3 Overcurrent Protection (CS+, CS-, ILIM, IMON, TMR)
- 7.3.4 Overcurrent Protection with Circuit Breaker (ILIM, TMR)
- 7.3.5 Overcurrent Protection With Latch-Off
- 7.3.6 Short-Circuit Protection (ISCP)
- 7.3.7 Analog Current Monitor Output (IMON)
- 7.3.8 Overvoltage and Undervoltage Protection (OV, UVLO, OVCLAMP)
- 7.3.9 Disabling Reverse Current Blocking Functionality (MODE)
- 7.3.10 Device Functional Modes
-
8 Applications and Implementation
- 8.1 Application Information
- 8.2
Typical Application: 200-V Unsuppressed Load Dump Protection Application
- 8.2.1 Design Requirements for 200-V Unsuppressed Load Dump Protection
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 VS Capacitance, Resistor R1 and Zener Clamp (DZ)
- 8.2.2.2 Charge Pump Capacitance VCAP
- 8.2.2.3 Input and Output Capacitance
- 8.2.2.4 Overvoltage and Undervoltage Protection Component Selection
- 8.2.2.5 Selection of Scaling Resistor (RSET) and Short-Circuit Protection Setting Resistor (RSCP)
- 8.2.2.6 Overcurrent Limit (ILIM), Circuit Breaker Timer (TMR), and Current Monitoring Output (IMON) Selection
- 8.2.2.7 Selection of Current Sense Resistor, RSNS
- 8.2.2.8 Hold-Up Capacitance
- 8.2.2.9 MOSFET Q1 Selection
- 8.2.2.10 MOSFET Q2 Selection
- 8.2.2.11 Input TVS Selection
- 8.2.3 Application Curves
- 8.3 Best Design Practices
- 8.4 Power Supply Recommendations
- 8.5 Layout
- 9 Device and Documentation Support
- 10Mechanical, Packaging, and Orderable Information
8.2.3 Application Curves
Figure 8-2 Unsuppressed Load Dump 200 V - Output Clamp (OVCLAMP = GND)
Figure 8-4 Unsuppressed Load Dump 200 V - Output Cut-off
Figure 8-6 Input Supply Short Interruption (100 μs). 
Figure 8-8 Power up 12 V - Charge Pump VCAP
Figure 8-10 Input Reverse Polarity (–14 V)
Figure 8-12 Device Wake-Up with Output Short to Ground. 
Figure 8-3 Unsuppressed Load Dump 200 V - Output Clamp (OVCLAMP = OV, TMR = 68 nF)
Figure 8-5 ISO 7637-2 Pulse 1 –600 V 50 Ω
Figure 8-7 Power up 12 V - DGATE and Output
Figure 8-9 Power up 12 V - DGATE and HGATE
Figure 8-11 Overcurrent Protection with Circuit Breaker (5-A). 
Figure 8-13 Output Short-Circuit Protection On-the-Fly