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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6.5 Electrical Characteristics VDD = 5 V

The following specifications apply for VDD = 5 V, PV1 = 7.8 V (continuos mode), AV = 2 V/V, R3 = 25.5 kΩ, RLS = 4.87 kΩ,
RL = 8 Ω, f = 1 kHz, SS/FF = GND, unless otherwise specified. Limits apply for TA = 25°C.(5)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
IDD Quiescent Power Supply Current VIN = 0, RLOAD = ∞ Fixed Frequency Mode (FF) 13.5 mA
Spread Spectrum Mode (SS) 14.5 22 mA
ISD Shutdown Current(3) VSD_BOOST = VSD_AMP = SS = FB_SEL = GND 0.11 1 μA
VIH Logic Voltage Input High 1.4 V
VIL Logic Voltage Input Low 0.4 V
TWU Wake-up Time CSS = 0.1 μF 49 ms
VOS Output Offset Voltage See (6) 0.04 3 mV
PO Output Power RL = 8 Ω
f = 1 kHz, BW = 22 kHz
THD+N = 1% 		FF   3 W
SS 2.6 3
RL = 8 Ω
f = 1 kHz, BW = 22 kHz
THD+N = 10% 		FF 3.8 W
SS 3.8
RL = 4 Ω
f = 1 kHz, BW = 22 kHz
THD+N = 1% 		FF 5.4 W
SS 5.4
RL = 4 Ω
f = 1 kHz, BW = 22 kHz
THD+N = 10% 		FF   6.7 W
SS 6.7
THD+N Total Harmonic Distortion + Noise PO = 2 W, f = 1 kHz,
RL = 8 Ω		 FF  0.03%
SS 0.03%
PO = 3 W, f = 1 kHz,
RL = 4 Ω 		FF  0.04%
SS 0.05%
εOS Output Noise f = 20 Hz to 20 kHz
Inputs to AC GND, No weighting		 FF    32 µVRMS
SS 32
f = 20 Hz to 20 kHz
Inputs to AC GND, A weighted		 FF    22 µVRMS
SS 22
PSRR Power Supply Rejection Ratio
(Input Referred)		 VRIPPLE = 200 mVP-P Sine,
fRIPPLE = = 217 Hz		 FF 88 dB
SS 87
VRIPPLE = 200 mVP-P Sine,
fRIPPLE = = 1 kHz		 FF 88 dB
SS 85
VRIPPLE = 200 mVP-P Sine,
fRIPPLE = = 10 kHz		 FF 77 dB
SS 76
CMRR Common-Mode Rejection Ratio
(Input Referred)		 VRIPPLE = 1 VP-P, fRIPPLE = 217 Hz 73 dB
η Efficiency f = 1 kHz, RL = 8 Ω, PO = 1 W 80%
VFB Feedback Pin Reference Voltage(4) 1.23 V