SLVSEJ2A February   2018  – April 2018 TPSM84424

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
      2.      Transient Response
  4. 4 Revision History
  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. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Development Support
      1. 11.2.1 Custom Design With WEBENCH® Tools
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information

7.3.7.2 Transient Response

The TPSM84424 transient response is listed in Table 8 for several common output voltages with different capacitor combinations. The calculated RTT value is included in the table along with the typical voltage deviation for a 1 A and 2 A load step. All data was taken at the recommended switching frequency for each output voltage.

Table 8. Output Voltage Transient Response

VIN = 12 V, CIN1 = 2x 10 µF Ceramic, CIN2 = 100 µF Electrolytic, TA = 25°C
VOUT(V) COUT1 Ceramic COUT2 BULK RTT (kΩ) VOLTAGE DEVIATION
1 A LOAD STEP 2 A LOAD STEP
0.8(1) 300 µF 220 µF 3.40 11 mV . (1.4%) 22 mV . (2.7%)
400 µF 330 µF 5.36 9 mV . (1.1%) 18 mV . (2.2%)
1(1) 200 µF - 2.00 15 mV . (1.5%) 30 mV . (3%)
200 µF 220 µF 3.01 12 mV . (1.2%) 24 mV . (2.4%)
400 µF - 6.04 11 mV . (1.1%) 23 mV . (2.3%)
400 µF 220 µF 5.49 10 mV . (1.0%) 20 mV . (2%)
1.2(1) 200 µF - 3.40 17 mV . (1.4%) 35 mV . (2.9%)
200 µF 220 µF 4.02 13 mV . (1.1%) 27 mV . (2.2%)
400 µF - 8.87 11 mV . (0.9%) 22 mV . (1.8%)
400 µF 220 µF 6.98 9 mV . (0.8%) 18 mV . (1.5%)
1.8(1) 100 µF - 3.40 27 mV . (1.6%) 56 mV . (3.1%)
300 µF - 14.3 11 mV . (0.6%) 22 mV . (1.2%)
100 µF 220 µF 4.87 12 mV . (0.7%) 24 mV . (1.3%)
3.3(2) 100 µF - 8.66 30 mV . (0.9%) 60 mV . (1.8%)
100 µF 220 µF 31.6 16 mV . (0.5%) 32 mV . (1.0%)
200 µF - 19.1 22 mV . (0.7%) 43 mV . (1.3%)
5(2) 100 µF - 10.0 42 mV . (0.9%) 83 mV . (1.7%)
100 µF 220 µF 31.6 16 mV . (0.3%) 32 mV . (0.6%)
200 µF - 22.1 24 mV . (0.5%) 48 mV . (1%)
7.5(2) 100 µF - 10.5 56 mV . (0.8%) 112 mV . (1.5%)
47 µF 220 µF 28.0 18 mV . (0.3%) 36 mV . (0.5%)
(1) Load step slew rate of 2 A/µs
(2) Load step slew rate of 1 A/µs