LM48510

Manufacturer Part NumberLM48510
ManufacturerTexas Instruments
LM48510 datasheet
 


Specifications of LM48510

Speaker ChannelsMonoSpeaker Amp TypeClass-D, Class-D Boosted
Output Power(w)1.55Psrr(db)83
Supply Min(min)(volt)2.7Supply Max(max)(volt)5.5
Pin/package16SON, 16WQFN, 16WSON  
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LM48510
LM48510
Boosted Class D Audio Power Amplifier
Literature Number: SNAS275D

LM48510 Summary of contents

  • Page 1

    ... LM48510 LM48510 Boosted Class D Audio Power Amplifier Literature Number: SNAS275D ...

  • Page 2

    ... The LM48510's switching regulator is a current-mode boost converter operating at a fixed frequency of 0.6MHz. The LM48510 is designed for use in mobile phones and other portable communication devices. The high (76%) efficiency extends battery life when compared to Boosted Class AB am- plifiers ...

  • Page 3

    ... Connection Diagram LLP-14 Pin DAP www.national.com LM48510SD Top View Order Number LM48510SD See NS Package Number SDA16B Name VO1 GND1 PV1 VO2 NC1 SD BOOST GND2 FB SW GND3 VDD NC2 IN+ IN AMP 2 20123267 Function ...

  • Page 4

    ... 2. 500mW 1kHz 15μH + 8Ω + 15μ 3. ≤ ≤ −40° MAX ≤ ≤ 15µH + 8Ω +15µ 150kΩ), LM48510 Typical Limit (Note 6) (Notes 7, 8) 6.06 8.75 0.01 1 1.5 1.4 0.5 0 1.7 1.2 0.9 1.11 1.9 0.98 1.55 0.06 0.07 www.national.com 37°C/W ≤ +85°C A ≤ 5.0V DD ≤ V 5.5V 1 ...

  • Page 5

    ... RIPPLE = RIPPLE P-P RIPPLE 1kHz 15μH + 8Ω + 15μ (Note 10 θ − the given in Absolute Maximum Ratings, whichever is lower LM48510 Typical Limit (Note 6) (Notes 300kΩ/ 217Hz 3.3V DD 1.23 , θ , and the ambient temperature, T ...

  • Page 6

    Typical Performance Characteristics THD+N vs Frequency = 15μH + 4Ω + 15μ 2.7V THD+N vs Frequency = 15μH + 4Ω + 15μ 3.3V THD+N vs Output Power = 15μH + ...

  • Page 7

    THD+N vs Output Power = 15μH + 4Ω + 15μ 3.3V Power Dissipation vs Output Power V = 2.7V DD Power Dissipation vs Output Power V = 4.2V DD www.national.com THD+N vs Output Power V ...

  • Page 8

    Power Supply Current vs Output Power V = 3.3V DD PSRR vs. Frequency = 15μH + 8Ω + 15μ 3.3V Supply Current vs. Supply Voltage load L 20123233 Power Supply Current vs ...

  • Page 9

    Feedback Voltage vs. Temperature Max Duty Cycle vs. Temperature R vs. V DS(ON) www.national.com Feedback Bias Current vs. Temperature 20123224 20123246 IN 20123228 8 20123225 R vs. Temperature DS(ON) 20123227 Output Power vs. Efficiency = 4Ω 201232c2 ...

  • Page 10

    Output Power vs. Efficiency = 8Ω 201232c3 Boost Converter Max. Load Current vs 20123265 www.national.com ...

  • Page 11

    ... Application Information GENERAL AMPLIFIER FUNCTION The audio amplifier portion of LM48510 is a Class D featuring a filterless modulation scheme. The differential outputs of the device switch at 300kHz from PV to GND. When there input signal applied, the two outputs (VO1 and VO2) switch with a 50% duty cycle, with both outputs in phase. Because the outputs of the Class D are differential, the two signals cancel each other ...

  • Page 12

    ... CONVERTER and V pin 1 1 Although the LM48510's internal Boost converter is internally compensated, the external feed-forward capacitor C quired for stability (see Figure 1). Adding this capacitor puts a zero in the loop response of the converter. The recom- mended frequency for the zero fz should be approximately 6kHz. C ...

  • Page 13

    ... E = L/2 X (lp)2 Where lp is the peak inductor current. An important point to observe is that the LM48510 will limit its switch current based on peak current. This means that since lp(max) is fixed, in- creasing L will increase the maximum amount of power avail- able to the load. Conversely, using too little inductance may limit the amount of load current which can be drawn from the output ...

  • Page 14

    ... PCB LAYOUT GUIDELINES High frequency boost converters require very careful layout of components in order to get stable operation and low noise. All components must be as close as possible to the LM48510 device recommended that a four layer PCB be used so that internal ground planes are available. ...

  • Page 15

    FIGURE 3. Demo Board Schematic Reference 14 20123268 ...

  • Page 16

    Demonstration Board Layout FIGURE 4. Top Layer Silkscreen FIGURE 6. GND Layer (middle 1) FIGURE 8. Bottom Layer 20123298 FIGURE 5. Top Trace Layer 20123262 FIGURE 7. Power Trace Layer (middle 2) 20123261 FIGURE 9. Bottom Silkscreen 15 20123264 20123263 ...

  • Page 17

    Build Of Material Designator Description Cf1 CHIP CAPACITOR GENERIC CINA CHIP CAPACITOR GENERIC CINB CHIP CAPACITOR GENERIC Co CHIP CAPACITOR GENERIC Cs1 CHIP CAPACITOR GENERIC Cs2 CHIP CAPACITOR GENERIC D1 SCHOTTKY DIO L1 R1 CHIP RESISTOR GENERIC R2 CHIP RESISTOR ...

  • Page 18

    Revision History Rev Date 1.0 11/16/06 1.1 03/07/07 1.2 10/15/07 Description Initial release. Changed the Limit value on the V and V SDIH Changed the typical value of Vfb = 1. 1.5 and 0.5 respectively. SDIL ...

  • Page 19

    ... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted LLP Package Order Number LM48510SD NS Package Number SDA16B 18 ...

  • Page 20

    Notes 19 www.national.com ...

  • Page 21

    THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE ...

  • Page 22

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...