ZHCSD80B january   2015  – august 2023 TPS62065-Q1 , TPS62067-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6.     Typical Characteristics
  9. 8 Parameter Measurement Information
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Mode Selection (TPS62065-Q1) and Forced PWM Mode (TPS62067A-Q1)
      2. 9.3.2 Power Good (PG, TPS62067x-Q1)
      3. 9.3.3 Enable
      4. 9.3.4 Shutdown and Output Discharge
      5. 9.3.5 Soft Start
      6. 9.3.6 Undervoltage Lockout (UVLO)
      7. 9.3.7 Internal Current Limit and Foldback Current Limit For Short-Circuit Protection
      8. 9.3.8 Clock Dithering
      9. 9.3.9 Thermal Shutdown
    4. 9.4 Device Functional Modes
      1. 9.4.1 Power Save Mode
        1. 9.4.1.1 Dynamic Voltage Positioning
        2. 9.4.1.2 100% Duty-Cycle Low-Dropout Operation
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Output Voltage Setting
        2. 10.2.2.2 Output Filter Design (Inductor And Output Capacitor)
          1. 10.2.2.2.1 Inductor Selection
          2. 10.2.2.2.2 Output Capacitor Selection
          3. 10.2.2.2.3 Input Capacitor Selection
        3. 10.2.2.3 Checking Loop Stability
      3. 10.2.3 Application Curves
    3. 10.3 Power Supply Recommendations
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 第三方产品免责声明
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 静电放电警告
    6. 11.6 术语表
  13. 12Mechanical, Packaging, and Orderable Information

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
10.2.2.2.1 Inductor Selection

The inductor value has a direct effect on the ripple current. The selected inductor has to be rated for its DC resistance and saturation current. The inductor ripple current (ΔIL) decreases with higher inductance and increases with higher VI or VO.

Equation 6 calculates the maximum inductor current in PWM mode under static load conditions. The saturation current of the inductor must be rated higher than the maximum inductor current as calculated with Equation 7. TI makes this recommendation because during heavy load transient, the inductor current rises above the calculated value.

Equation 6. GUID-0E0A91E3-B0C9-4711-82D9-657DCF592AF9-low.gif

where

  • ΔIL = peak-to-peak inductor ripple current
  • L = inductor value
  • f = switching frequency (3-MHz typical)
Equation 7. GUID-8D503841-A710-4EFC-9332-51338C60F767-low.gif

where

  • ILmax = maximum inductor current

A more conservative approach is to select the inductor current rating just for the switch current limit ILIMF of the converter.

The total losses of the coil have a strong impact on the efficiency of the DC/DC conversion and consist of both the losses in the DC resistance R(DC) and the following frequency-dependent components:

  • The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
  • Additional losses in the conductor from the skin effect (current displacement at high frequencies)
  • Magnetic field losses of the neighboring windings (proximity effect)
Table 10-1 List of Inductors
INDUCTOR TYPEINDUCTANCE (μH)CURRENT (A)DIMENSIONS (mm)MANUFACTURER
XEL4020-102ME1.013.254 × 4 × 2Coilcraft
DFE252012PD-1R0M1.03.82.5 × 2.0 × 1.2Murata