SNAS416K July   2007  – November 2019 LM48511

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      EMI Graph: LM48511 RF Emissions — 3-Inch Cable
  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 VDD = 5 V
    6. 6.6 Electrical Characteristics VDD = 3.6 V
    7. 6.7 Electrical Characteristics VDD = 3 V
    8. 6.8 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 General Amplifier Function
      2. 7.3.2 Differential Amplifier Explanation
      3. 7.3.3 Audio Amplifier Power Dissipation and Efficiency
      4. 7.3.4 Regulator Power Dissipation
      5. 7.3.5 Shutdown Function
      6. 7.3.6 Regulator Feedback Select
    4. 7.4 Device Functional Modes
      1. 7.4.1 7.4.1 Fixed Frequency
      2. 7.4.2 7.4.2 Spread Spectrum 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  Proper Selection of External Components
        2. 8.2.2.2  Power Supply Bypassing
        3. 8.2.2.3  Audio Amplifier Gain Setting Resistor Selection
        4. 8.2.2.4  Audio Amplifier Input Capacitor Selection
        5. 8.2.2.5  Selecting Regulator Output Capacitor
        6. 8.2.2.6  Selecting Regulating Bypass Capacitor
        7. 8.2.2.7  Selecting the Soft-Start (CSS) Capacitor
        8. 8.2.2.8  Selecting Diode (D1)
        9. 8.2.2.9  Duty Cycle
        10. 8.2.2.10 Selecting Inductor Value
        11. 8.2.2.11 Inductor Supplies
        12. 8.2.2.12 Setting the Regulator Output Voltage (PV1)
        13. 8.2.2.13 Discontinuous and Continuous Operation
        14. 8.2.2.14 ISW Feed-Forward Compensation for Boost Converter
        15. 8.2.2.15 Calculating Regulator Output Current
        16. 8.2.2.16 Design Parameters VSW and ISW
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Power and Ground Circuits
      2. 10.1.2 Layout Helpful Hints
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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6.8 Typical Characteristics

LM48511 300222g9.gifFigure 1. THD+N vs Frequency
VDD = 5 V, RL = 8 Ω
PO = 2 W, Filter = 22 kHz, PV1 = 7.8 V
LM48511 300222g8.gifFigure 3. THD+N vs Frequency
VDD = 3 V, RL = 8 Ω
PO = 1.5 W, Filter = 22 kHz, PV1 = 7 V
LM48511 300222h1.gifFigure 5. THD+N vs Output Power
VDD = 3.6 V, RL = 8 Ω
f = 1 kHz, Filter = 22 kHz, PV1 = 7 V
LM48511 300222i1.gifFigure 7. THD+N vs Output Power
VDD = 3 V, 3.6 V, 5 V, RL = 8 Ω
f = 1kHz, Filter = 22 kHz, R1 = 4.87 kΩ, FF
LM48511 300222f7.gifFigure 9. Boost Amplifier vs Output Power
VDD = 5 V, RL = 8 Ω
f = 1 kHz, PV1 = 7.8 V
LM48511 300222f6.gifFigure 11. Boost Amplifier vs Output Power
VDD = 3 V, RL = 8 Ω
f = 1 kHz, PV1 = 4.8 V
LM48511 300222g1.gifFigure 13. PSRR vs Frequency
VDD = 3.6 V, RL = 8 Ω
VRIPPLE = 200 mVPP, PV1 = 7 V
LM48511 300222g6.gifFigure 15. Supply Current vs Supply Voltage
PV1 = 7.8 V
LM48511 300222g4.gifFigure 17. Supply Current vs Supply Voltage
PV1 = 4.8 V
LM48511 300222f8.gifFigure 19. Power Dissipation vs Output Power
VDD = 3.6 V, RL = 8 Ω
PV1 = 7 V, FF
LM48511 300222h8.gifFigure 21. Boost Converter Efficiency vs ILOAD(DC)
VDD = 5 V, PV1 = 7.8 V
LM48511 300222h7.gifFigure 23. Boost Converter Efficiency vs ILOAD(DC)
VDD = 3 V, PV1 = 4.8 V
LM48511 300222g7.gifFigure 2. THD+N vs Frequency
VDD = 3.6 V, RL = 8 Ω
PO = 500 mW, Filter = 22 kHz, PV1 = 4.8 V
LM48511 300222h4.gifFigure 4. THD+N vs Output Power
VDD = 5 V, RL = 8 Ω
PO = 1.5 W, f = 1 kHz, Filter = 22 kHz, PV1 = 7.8 V
LM48511 300222h3.gifFigure 6. THD+N vs Output Power
VDD = 3 V, RL = 8 Ω
f = 1 kHz, Filter = 22 kHz, PV1 = 4.8 V
LM48511 300222i0.gifFigure 8. THD+N vs Output Power
VDD = 3.6 V, RL = 8 Ω
Filter = 22 kHz, PV1 = 7.8 V, PV1 = 7 V, PV1 = 4.8 V, FF
LM48511 300222f5.gifFigure 10. Boost Amplifier vs Output Power
VDD = 3.6 V, RL = 8 Ω
f = 1 kHz, PV1 = 7 V
LM48511 300222g3.gifFigure 12. PSRR vs Frequency
VDD = 5 V, RL = 8 Ω
VRIPPLE = 200 mVPP, PV1 = 7.8 V
LM48511 300222g2.gifFigure 14. PSRR vs Frequency
VDD = 3 V, RL = 8 Ω
VRIPPLE = 200 mVPP, PV1 = 4.8 V
LM48511 300222g5.gifFigure 16. Supply Current vs Supply Voltage
PV1 = 7 V
LM48511 300222g0.gifFigure 18. Power Dissipation vs Output Power
VDD = 5 V, RL = 8 Ω
PV1 = 7.8 V, FF
LM48511 300222f9.gifFigure 20. Power Dissipation vs Output Power
VDD = 3 V, RL = 8 Ω
PV1 = 4.8 V, FF
LM48511 300222h6.gifFigure 22. Boost Converter Efficiency vs ILOAD(DC)
VDD = 3.6 V, PV1 = 7 V