JAJSF89C March   2013  – December 2019 TPS84A20

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      アプリケーション概略図
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Ordering Information
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Recommended Operating Conditions
    3. 7.3 Package Specifications
    4. 7.4 Electrical Characteristics
    5. 7.5 Thermal Information
  8. 8 Device Information
    1. 8.1      Functional Block Diagram
    2. Table 1. Pin Descriptions
  9. 9 Typical Characteristics (PVIN = VIN = 12 V)
  10. 10Typical Characteristics (PVIN = VIN = 5 V)
  11. 11Typical Characteristics (PVIN = 3.3 V, VIN = 5 V)
  12. 12Application Information
    1. 12.1  Adjusting the Output Voltage
    2. 12.2  Capacitor Recommendations for the TPS84A20 Power Supply
      1. 12.2.1 Capacitor Technologies
        1. 12.2.1.1 Electrolytic, Polymer-Electrolytic Capacitors
        2. 12.2.1.2 Ceramic Capacitors
        3. 12.2.1.3 Tantalum, Polymer-Tantalum Capacitors
      2. 12.2.2 Input Capacitor
      3. 12.2.3 Output Capacitor
    3. 12.3  Transient Response
    4. 12.4  Transient Waveforms
    5. 12.5  Application Schematics
    6. 12.6  VIN and PVIN Input Voltage
    7. 12.7  3.3 V PVIN Operation
    8. 12.8  Power Good (PWRGD)
    9. 12.9  Light Load Efficiency (LLE)
    10. 12.10 SYNC_OUT
    11. 12.11 Parallel Operation
    12. 12.12 Power-Up Characteristics
    13. 12.13 Pre-Biased Start-Up
    14. 12.14 Remote Sense
    15. 12.15 Thermal Shutdown
    16. 12.16 Output On/Off Inhibit (INH)
    17. 12.17 Slow Start (SS/TR)
    18. 12.18 Overcurrent Protection
    19. 12.19 Synchronization (CLK)
    20. 12.20 Sequencing (SS/TR)
    21. 12.21 Programmable Undervoltage Lockout (UVLO)
    22. 12.22 Layout Considerations
    23. 12.23 EMI
  13. 13デバイスおよびドキュメントのサポート
    1. 13.1 ドキュメントの更新通知を受け取る方法
    2. 13.2 サポート・リソース
    3. 13.3 商標
    4. 13.4 静電気放電に関する注意事項
    5. 13.5 Glossary
  14. 14メカニカル、パッケージ、および注文情報
    1. 14.1 Tape and Reel Information

パッケージ・オプション

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ（パッケージ｜ピン）
  • RVQ|42
サーマルパッド・メカニカル・データ
発注情報

12.1 Adjusting the Output Voltage

The VADJ control sets the output voltage of the TPS84A20. The output voltage adjustment range is from 0.6 V to 5.5 V. 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 26) and AGND (pin 23). The SENSE+ pin (pin 27) must be connected to VOUT either at the load for improved regulation or at VOUT of the device. The RRT resistor must be connected directly between the RT/CLK (pin 22) and AGND (pin 23). Table 2 gives the standard external RSET resistor for a number of common bus voltages, along with the recommended RRT resistor for that output voltage.

Table 2. Standard RSET Resistor Values for Common Output Voltages

RESISTORS OUTPUT VOLTAGE VOUT (V)
0.9 1.0 1.2 1.8 2.5 3.3 5.0
RSET (kΩ) 2.87 2.15 1.43 0.715 0.453 0.316 0.196
RRT (kΩ) 1000 1000 487 169 90.9 90.9 63.4

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 3.

Equation 1. TPS84A20 q_rset01_lvsaw7.gif

Table 3. Standard RSET Resistor Values

VOUT (V) RSET (kΩ) RRT(kΩ) fSW(kHz) VOUT (V) RSET (kΩ) RRT(kΩ) fSW(kHz)
0.6 open OPEN 200 3.1 0.348 90.9 750
0.7 8.66 OPEN 200 3.2 0.332 90.9 750
0.8 4.32 OPEN 200 3.3 0.316 90.9 750
0.9 2.87 1000 250 3.4 0.309 90.9 750
1.0 2.15 1000 250 3.5 0.294 90.9 750
1.1 1.74 1000 250 3.6 0.287 90.9 750
1.2 1.43 487 300 3.7 0.280 90.9 750
1.3 1.24 487 300 3.8 0.267 90.9 750
1.4 1.07 487 300 3.9 0.261 90.9 750
1.5 0.953 487 300 4.0 0.255 90.9 750
1.6 0.866 487 300 4.1 0.243 63.4 1000
1.7 0.787 487 300 4.2 0.237 63.4 1000
1.8 0.715 169 500 4.3 0.232 63.4 1000
1.9 0.665 169 500 4.4 0.226 63.4 1000
2.0 0.619 169 500 4.5 0.221 63.4 1000
2.1 0.576 169 500 4.6 0.215 63.4 1000
2.2 0.536 169 500 4.7 0.210 63.4 1000
2.3 0.511 169 500 4.8 0.205 63.4 1000
2.4 0.475 169 500 4.9 0.200 63.4 1000
2.5 0.453 90.9 750 5.0 0.196 63.4 1000
2.6 0.432 90.9 750 5.1 0.191 63.4 1000
2.7 0.412 90.9 750 5.2 0.187 63.4 1000
2.8 0.392 90.9 750 5.3 0.182 63.4 1000
2.9 0.374 90.9 750 5.4 0.178 63.4 1000
3.0 0.357 90.9 750 5.5 0.174 63.4 1000