SLVS413K October   2002  – July 2022 TPS61040 , TPS61041

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Peak Current Control
      2. 7.3.2 Soft Start
      3. 7.3.3 Enable
      4. 7.3.4 Undervoltage Lockout
      5. 7.3.5 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation
  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 Inductor Selection, Maximum Load Current
        2. 8.2.2.2 Setting the Output Voltage
        3. 8.2.2.3 Line and Load Regulation
        4. 8.2.2.4 Output Capacitor Selection
        5. 8.2.2.5 Input Capacitor Selection
        6. 8.2.2.6 Diode Selection
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Third-Party Products Disclaimer
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

8.2.2.4 Output Capacitor Selection

For best output voltage filtering, a low ESR output capacitor is recommended. Ceramic capacitors have a low ESR value but tantalum capacitors can be used as well, depending on the application.

Assuming the converter does not show double pulses or pulse bursts on the switch node (SW), the output voltage ripple can be calculated as:

Equation 7. GUID-81985773-45FB-4B32-A3EE-47524963526A-low.gif

where

  • IP = Peak current as described in Peak Current Control
  • L = Selected inductor value
  • Iout = Nominal load current
  • fS (Iout) = Switching frequency at the nominal load current as calculated previously
  • Vd = Rectifier diode forward voltage (typically 0.3 V)
  • Cout = Selected output capacitor
  • ESR = Output capacitor ESR value

See Table 8-3 and the Typical Application for choosing the output capacitor.

Table 8-3 Recommended Input and Output Capacitors
DEVICE CAPACITOR VOLTAGE RATING COMPONENT SUPPLIER(1) COMMENTS
TPS6104x 4.7 μF/X5R/0805 6.3 V Tayo Yuden JMK212BY475MG CIN/COUT
10 μF/X5R/0805 6.3 V Tayo Yuden JMK212BJ106MG CIN/COUT
1 μF/X7R/1206 25 V Tayo Yuden TMK316BJ105KL COUT
1 μF/X5R/1206 35 V Tayo Yuden GMK316BJ105KL COUT
4.7 μF/X5R/1210 25 V Tayo Yuden TMK325BJ475MG COUT
(1) See Third-Party Products disclaimer.