ZHCSIR2 September 2018 LM2735-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
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1 LM2735X-Q1 SOT-23 Design Example 1
- 8.2.2 LM2735Y-Q1 SOT-23 Design Example 2
- 8.2.3 LM2735X-Q1 WSON Design Example 3
- 8.2.4 LM2735Y-Q1 WSON Design Example 4
- 8.2.5 LM2735X-Q1 SOT-23 Design Example 6
- 8.2.6 LM2735Y-Q1 SOT-23 Design Example 7
- 8.2.7 LM2735X-Q1 SOT-23 Design Example 8
- 8.2.8 LM2735Y-Q1 SOT-23 Design Example 9
- 8.2.9 LM2735X-Q1 WSON Design Example 10
- 8.2.10 LM2735Y-Q1 WSON Design Example 11
- 8.2.11 LM2735X-Q1 WSON SEPIC Design Example 12
- 8.2.12 LM2735X-Q1 SOT-23 LED Design Example 14
- 8.2.13 LM2735Y-Q1 WSON FlyBack Design Example 15
- 8.2.14 LM2735X-Q1 SOT-23 LED Design Example 16 VRAIL > 5.5 V Application
- 8.2.15 LM2735X-Q1 SOT-23 LED Design Example 17 Two-Input Voltage Rail Application
- 8.2.16 SEPIC Converter
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
8.2.16.1.3 Steady State Analysis With Loss Elements
Using inductor volt-second balance and capacitor charge balance, the following equations are derived:
Equation 24. 
Equation 25. 
Therefore:
Equation 26. 
One can see that all variables are known except for the duty cycle (D). A quadratic equation is needed to solve for D. A less accurate method of determining the duty cycle is to assume efficiency, and calculate the duty cycle.
Equation 27. 
Equation 28. 
Figure 39. Efficiencies for Typical SEPIC Application