ZHCSLY9A October 2020 – December 2020 LM7310
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 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 Input Reverse Polarity Protection
- 7.3.2 Undervoltage Protection (UVLO & UVP)
- 7.3.3 Overvoltage Lockout (OVLO)
- 7.3.4 Inrush Current control and Fast-trip
- 7.3.5 Analog Load Current Monitor Output
- 7.3.6 Reverse Current Protection
- 7.3.7 Overtemperature Protection (OTP)
- 7.3.8 Fault Response
- 7.3.9 Power Good Indication (PG)
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
8.2.1.2.2 Setting Output Voltage Rise Time (tR)
The slew rate (SR) needed to achieve the desired output rise time can be calculated as:
Equation 8. 
The CdVdt needed to achieve this slew rate can be calculated as:
Equation 9. 
Choose the nearest standard capacitor value as 3300 pF.
For this slew rate, the inrush current can be calculated as:
Equation 10. 
The average power dissipation inside the part during inrush can be calculated as:
Equation 11. 
The power dissipation is below the allowed limit for a successful start-up without hitting thermal shut-down within the target rise time as shown in the Figure 8-3.
Figure 8-3 Thermal shut-down plot during inrush