ZHCSCC8E March 2014 – July 2018 TPS92601-Q1 , TPS92602-Q1
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
- 1 特性
- 2 应用范围
- 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 Fixed-Frequency PWM Control
- 7.3.2 Slope-Compensation Output Current
- 7.3.3 Boost-Current Limit
- 7.3.4 Oscillator and PLL
- 7.3.5 Control Loop Compensation
- 7.3.6 LED Open-Circuit Detection
- 7.3.7 Output Short-Circuit and Overcurrent Detection
- 7.3.8 Measuring LED Current During a Non-Failure Condition
- 7.3.9 LED Dimming Options
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1
Boost Regulator With Separate or Paralleled Channels
- 8.2.1.1 Design Requirements
- 8.2.1.2
Detailed Design Procedure
- 8.2.1.2.1 Switching Frequency
- 8.2.1.2.2 Maximum Output-Current Set Point
- 8.2.1.2.3 Output Overvoltage-Protection Set Point
- 8.2.1.2.4 Duty Cycle Estimation
- 8.2.1.2.5 Inductor Selection
- 8.2.1.2.6 Rectifier Diode Selection
- 8.2.1.2.7 Output Capacitor Selection
- 8.2.1.2.8 Input Capacitor Selection
- 8.2.1.2.9 Current Sense and Current Limit
- 8.2.1.2.10 Switching MOSFET Selection
- 8.2.1.2.11 Loop Compensation
- 8.2.1.3 Application Curves
- 8.2.2
Boost-to-Battery Regulator
- 8.2.2.1 Design Requirements
- 8.2.2.2
Detailed Design Procedure
- 8.2.2.2.1 Switching Frequency
- 8.2.2.2.2 Maximum Output-Current Set Point
- 8.2.2.2.3 Output Overvoltage-Protection Set Point
- 8.2.2.2.4 Duty Cycle Estimation
- 8.2.2.2.5 Inductor Selection
- 8.2.2.2.6 Rectifier Diode Selection
- 8.2.2.2.7 Output Capacitor Selection
- 8.2.2.2.8 Input Capacitor Selection
- 8.2.2.2.9 Current Sense and Current Limit
- 8.2.2.2.10 Switching MOSFET Selection
- 8.2.2.2.11 Loop Compensation
- 8.2.2.3 TPS92602y-Q1 Application Curves
- 8.2.1
Boost Regulator With Separate or Paralleled Channels
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
8.2.1.2.7 Output Capacitor Selection
Assume a maximum LED current ripple of 0.1 × I(LED). Also, assume that the dynamic impedance of the chosen LED is 0.2 Ω (1.8 Ω total for the nine-LED string). The total output-voltage ripple calculation is then as per Equation 28.
Equation 28. 
Assuming a ripple contribution of 95% from bulk capacitance, Equation 29 calculates the output capacitor.
Equation 29. 
Equation 30. 
Use three 3.3-μF capacitors in parallel to achieve the minimum output capacitance of 10 μF. Ensure that the chosen capacitors meet the minimum bulk capacitance requirement at the operating voltage.