JAJSEQ4A February   2018  – April 2018 TPSM84424

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      概略回路図
      2.      過渡応答
  4. 4 改訂履歴
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics (VIN = 12 V)
    8. 6.8 Typical Characteristics (VIN = 5 V)
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Adjusting the Output Voltage
      2. 7.3.2  Switching Frequency (RT)
      3. 7.3.3  Synchronization (CLK)
      4. 7.3.4  Output On/Off Enable (EN)
      5. 7.3.5  Input Capacitor Selection
      6. 7.3.6  Output Capacitor Selection
      7. 7.3.7  TurboTrans (TT)
        1. 7.3.7.1 Low-ESR Output Capacitors
        2. 7.3.7.2 Transient Response
          1. 7.3.7.2.1 Transient Waveforms (VIN = 12 V)
      8. 7.3.8  Undervoltage Lockout (UVLO)
      9. 7.3.9  Soft Start (SS/TR)
      10. 7.3.10 Sequencing (SS/TR)
      11. 7.3.11 Power Good (PGOOD)
      12. 7.3.12 Safe Start-up into Pre-Biased Outputs
      13. 7.3.13 Overcurrent Protection
      14. 7.3.14 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Active Mode
      2. 7.4.2 Shutdown Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Output Voltage Setpoint
        3. 8.2.2.3 Setting the Switching Frequency
        4. 8.2.2.4 Input Capacitors
        5. 8.2.2.5 Output Capacitors
        6. 8.2.2.6 TurboTrans Resistor
        7. 8.2.2.7 Application Waveforms
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 EMI
      1. 10.3.1 EMI Plots
    4. 10.4 Package Specifications
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 デバイス・サポート
      1. 11.1.1 デベロッパー・ネットワークの製品に関する免責事項
    2. 11.2 開発サポート
      1. 11.2.1 WEBENCH®ツールによるカスタム設計
    3. 11.3 ドキュメントの更新通知を受け取る方法
    4. 11.4 コミュニティ・リソース
    5. 11.5 商標
    6. 11.6 静電気放電に関する注意事項
    7. 11.7 Glossary
  12. 12メカニカル、パッケージ、および注文情報
    1. 12.1 Tape and Reel Information

7.3.1 Adjusting the Output Voltage

A resistor divider connected to the FB pin (pin 2) programs the output voltage of the TPSM84424. The output voltage adjustment range is from 0.6 V to 10 V. Figure 11 shows the feedback resistor connection for setting the output voltage. The recommended value of RFBT is 10 kΩ. The value for RFBB can be calculated using Equation 1 or simply selected from the range of values given in Table 1. Table 1 also includes the recommended switching frequency and minimum required output capacitance for each output voltage.

Equation 1. TPSM84424 SDRfbbEq.gif
TPSM84424 FBresistorDiv2.gifFigure 11. Setting the Output Voltage

Table 1. Standard Component Values

VOUT (V) RFBB (kΩ) RECOMMENDED
fSW (kHz)		 RRT (kΩ) Minimum Required COUT(µF)(1)(2)
CERAMIC POLYMER(3)
0.6 open 250 200 400 220
0.7 60.4 250 200 400 220
0.8 30.1 300 165 300 220
0.9 20.0 350 143 200 220
1.0 15.0 400 124 200 -
1.1 12.1 400 124 200 -
1.2 10.0 450 110 200 -
1.3 8.66 500 97.6 200 -
1.4 7.50 500 97.6 200 -
1.5 6.65 550 88.7 150 -
1.6 6.04 550 88.7 150 -
1.7 5.49 600 82.5 150 -
1.8 4.99 600 82.5 100 -
1.9 4.64 650 75.0 100 -
2.0 4.32 700 69.8 100 -
2.5 3.16 800 60.4 100 -
3.3 2.21 1000 48.7 47 -
5.0 1.37 1200 40.2 47 -
6.0 1.10 1200 40.2 47 -
7.5 0.866 1300 36.5 47 -
9.0 0.715 1300 36.5 22 -
10 0.634 1300 36.5 22 -
(1) Additional capacitance above the minimum can be ceramic or polymer type.
(2) Load transients with > 2 A/µs slew rates may require additional capacitance, see TurboTrans.
(3) See Low-ESR Output Capacitors for details on polymer capacitors.