ZHCS447C SEPTEMBER   2011  – April  2018 TPS84210

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      简化应用
      2.      效率与输出电流间的关系
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Package Specifications
    3. 6.3 Thermal Information
    4. 6.4 Electrical Characteristics
    5. 6.5 Switching Characteristics
    6. 6.6 Typical Characteristics (VIN = 5 V)
    7. 6.7 Typical Characteristics (VIN = 3.3 V)
  7. 7 Functional Block Diagram
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Adjusting The Output Voltage
  9. 9 Capacitor Recommendations For The TPS84210 Power Supply
    1. 9.1 Capacitor Technologies
      1. 9.1.1 Electrolytic, Polymer-Electrolytic Capacitors
      2. 9.1.2 Ceramic Capacitors
      3. 9.1.3 Tantalum, Polymer-Tantalum Capacitors
    2. 9.2 Input Capacitor
    3. 9.3 Output Capacitor
  10. 10Transient Response
  11. 11Application Schematics
  12. 12Power Good (PWRGD)
  13. 13Power-Up Characteristics
  14. 14Remote Sense
  15. 15Output On/Off Inhibit (INH)
  16. 16Slow Start (SS/TR)
  17. 17Overcurrent Protection
  18. 18Synchronization (CLK)
  19. 19Sequencing (SS/TR)
  20. 20Programmable Undervoltage Lockout (UVLO)
  21. 21Thermal Shutdown
  22. 22Layout Guidelines
  23. 23Layout Example
  24. 24EMI
  25. 25器件和文档支持
    1. 25.1 接收文档更新通知
    2. 25.2 社区资源
    3. 25.3 商标
    4. 25.4 静电放电警告
    5. 25.5 术语表
  26. 26机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

8.1.1 Adjusting The Output Voltage

The VADJ control sets the output voltage of the TPS84210. The output voltage adjustment range is from 0.8V to 3.6V. The adjustment method requires the addition of RSET, which sets the output voltage, the connection of SENSE+ to VOUT, and in some cases RRT which sets the switching frequency. The RSET resistor must be connected directly between the VADJ (pin 35) and AGND (pin 33 & 34). The SENSE+ pin (pin 36) must be connected to VOUT either at the load for improved regulation or at VOUT of the module. The RRT resistor must be connected directly between the RT/CLK (pin 4) and AGND (pins 33 & 34).

Table 1 gives the standard external RSET resistor for a number of common bus voltages, along with the recommended RRT resistor for that output voltage.

Table 1. Standard RSET Resistor Values for Common Output Voltages

RESISTORS OUTPUT VOLTAGE VOUT (V)
0.8 1.2 1.5 1.8 2.5 3.3
RSET (kΩ) open 2.87 1.65 1.15 0.673 0.459
RRT (kΩ) 1200 715 348 348 174 174

For other output voltages, the value of the required resistor can either be calculated using the following formula, or simply selected from the range of values given in Table 2.

Equation 1. TPS84210 q_rset01_lvsaz4.gif

Table 2. Standard RSET Resistor Values

VOUT (V) RSET (kΩ) RRT(kΩ) fSW(kHz) VOUT (V) RSET (kΩ) RRT(kΩ) fSW(kHz)
0.8 open 1200 650 2.3 0.768 174 1500
0.9 11.8 1200 650 2.4 0.715 174 1500
1.0 5.83 1200 650 2.5 0.673 174 1500
1.1 3.83 1200 650 2.6 0.634 174 1500
1.2 2.87 715 750 2.7 0.604 174 1500
1.3 2.32 715 750 2.8 0.576 174 1500
1.4 1.91 715 750 2.9 0.549 174 1500
1.5 1.65 348 1000 3.0 0.523 174 1500
1.6 1.43 348 1000 3.1 0.499 174 1500
1.7 1.27 348 1000 3.2 0.475 174 1500
1.8 1.15 348 1000 3.3 0.459 174 1500
1.9 1.05 348 1000 3.4 0.442 174 1500
2.0 0.953 174 1500 3.5 0.422 174 1500
2.1 0.845 174 1500 3.6 0.412 174 1500
2.2 0.825 174 1500