ZHCSQD0 April 2022 LM5013-Q1
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 Control Architecture
- 7.3.2 Internal VCC Regulator and Bootstrap Capacitor
- 7.3.3 Regulation Comparator
- 7.3.4 Internal Soft Start
- 7.3.5 On-Time Generator
- 7.3.6 Current Limit
- 7.3.7 N-Channel Buck Switch and Driver
- 7.3.8 Schottky Diode Selection
- 7.3.9 Enable/Undervoltage Lockout (EN/UVLO)
- 7.3.10 Power Good (PGOOD)
- 7.3.11 Thermal Protection
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
8.2.2.5 Output Capacitor (COUT)
Select a ceramic output capacitor to limit the capacitive voltage ripple at the converter output. This is the sinusoidal ripple voltage that is generated from the triangular inductor current ripple flowing into and out of the capacitor. Select an output capacitance using Equation 13 to limit the voltage ripple component to 0.5% of the output voltage.
Equation 13. 
Substituting ΔIL(nom) of 1.36 A gives COUT greater than 10 μF. Considering the voltage coefficients of ceramic capacitors, a 22-µF, 25-V rated capacitor with X7R dielectric is selected.