ZHCU740 April   2020

 

  1.    说明
  2.    资源
  3.    特性
  4.    应用
  5.    设计图像
  6. 1System Overview
    1. 1.1 Key System Specifications
    2. 1.2 Block Diagram
    3. 1.3 Top Side Pump
    4. 1.4 LED Driver Input Signals
    5. 1.5 LED Driver SDIM/UDIM Settings
    6. 1.6 TPS92641 Board Description
    7. 1.7 Setting the LED Current and Analog Dimming
    8. 1.8 PWM Dimming
  7. 2LED Driver Key Parameters
    1. 2.1 Enable and Disable Delay
    2. 2.2 Rise and Fall Time
    3. 2.3 Ripple
    4. 2.4 Performance Parameters
    5. 2.5 LED Load Capacitor for Rise/Fall Time
    6. 2.6 LED Load Capacitor And Audible Noise
      1. 2.6.1 Layout Considerations
      2. 2.6.2 Electrolytic capacitor considerations
      3. 2.6.3 Standoff Capacitors
    7. 2.7 LED Driver Calculator Tool
  8. 3Layout
  9. 4Related Documentation
    1. 4.1 商标
    2. 4.2 Third-Party Products Disclaimer

1 System Overview

The TPS92641 is a high-voltage and synchronous NFET controller for buck-current regulators. Output current regulation is based on valley current-mode operation using on-time control architecture. This control method eases the loop compensation design and faster transient response. The PWM controller supports both analog and PWM input signals resulting in exceptional dimming control range. A linear dimmer between input command and LED current is achieved with true zero current using a low off-set error amplifier and proprietary PWM dimming logic. Protection features include cycle-by-cycle current protection, overvoltage protection, and thermal shutdown. LED driver has 3 separate driver blocks which allows for flexible color overlap schemes. As shown in Figure 1 the LED driver has 3 separate driver blocks, allowing for flexible color overlap schemes.

Figure 1. TPS92641TIDA-080008 TPS92641_Schematic.gif