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
7.3.8 Measuring LED Current During a Non-Failure Condition
In regular operation mode, one can measure the actual output current of the controller with an external microcontroller by sensing the voltage at the DIAGx pin. The DIAGx pin voltage between 0.2 V and 2.85 V represents in a linear relation the output current measured by the current-sense block across the external shunt resistor. Parameter DIAGfactor gives the scale factor of typically 12.5 (the TPS92601y-Q1 or TPS92602y-Q1 device with 150-mV full-scale current-sense voltage) or 6.25 (the TPS92601A-Q1 or TPS92602A-Q1 device with 300-mV full-scale current-sense voltage). Figure 11 gives the relation between the DIAGx pin voltage and the current-sense voltage.
Figure 11. DIAGx Pin Function When the device is in global shutdown mode (when both PWMINx pins go low for t > t(CH_OFF)), both DIAGx pins are low.