ZHCSG23A March 2017 – February 2018 LM25141-Q1
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 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 High Voltage Start-Up Regulator
- 7.3.2 VCC Regulator
- 7.3.3 Oscillator
- 7.3.4 Synchronization
- 7.3.5 Frequency Dithering (Spread Spectrum)
- 7.3.6 Enable
- 7.3.7 Power Good
- 7.3.8 Output Voltage
- 7.3.9 Current Sense
- 7.3.10 DCR Current Sensing
- 7.3.11 Error Amplifier and PWM Comparator
- 7.3.12 Slope Compensation
- 7.3.13 Hiccup Mode Current Limiting
- 7.3.14 Standby Mode
- 7.3.15 Soft Start
- 7.3.16 Diode Emulation
- 7.3.17 High- and Low-Side Drivers
-
8 Application and Implementation
- 8.1 Application Information
- 8.2 Typical Application
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
7.3.12 Slope Compensation
The LM25141-Q1 provides internal slope compensation to ensure stable operation with a duty cycle greater than 50%. To correctly use the internal slope compensation, the inductor value must be calculated based on the following guidelines (Equation 13 assumes an inductor ripple current of 30%):
Equation 13. 
- Lower inductor values increase the peak-to-peak inductor current, which minimizes size and cost and improves transient response at the cost of reduced efficiency due to higher peak currents.
- Higher inductance values decrease the peak-to-peak inductor current typically increases efficiency by reducing the RMS current at the cost of requiring larger output capacitors to meet load-transient specifications.