LM48520

Manufacturer Part NumberLM48520
ManufacturerTexas Instruments
LM48520 datasheet
 


Specifications of LM48520

Speaker ChannelsStereoSpeaker Amp TypeClass-D, Class-D Boosted
Output Power(w)1.3Psrr(db)82
Supply Min(min)(volt)2.6Supply Max(max)(volt)5
Pin/package25DSBGA  
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
Page 1/20

Download datasheet (344Kb)Embed
Next
LM48520
LM48520
Boosted Stereo Class D Audio Power Amplifier with Output
Speaker Protection and Spread Spectrum
Literature Number: SNAS367B

LM48520 Summary of contents

  • Page 1

    ... LM48520 LM48520 Boosted Stereo Class D Audio Power Amplifier with Output Speaker Protection and Spread Spectrum Literature Number: SNAS367B ...

  • Page 2

    ... PWM architecture that eliminates the output filter, reducing external component count, board area, power consumption, system cost, and simplifying design. The LM48520 is designed for use in mobile phones and other portable communication devices. The high (78%) efficiency extends battery life when compared to Boosted Class AB am- plifiers ...

  • Page 3

    ... Typical Application FIGURE 1. Typical LM48520 Audio Amplifier Application Circuit www.national.com 2 20198701 ...

  • Page 4

    ... Connection Diagrams LM48520TL Top View Order Number LM48520TL See NS Package Number TLA25AAA Micro SMD Marking 20198721 Top View X — Date Code T — Die Traceability G — Boomer Family I5 — LM48520TL 3 20198702 www.national.com ...

  • Page 5

    Pin Descriptions Pin Designator Pin Name A1 VDD A2 BstFB A3 Soft Start A4 SW_GND INR+ B2 INR- B3 FB_GND B4 INL- B5 INL BstSD C3 GND C4 Gain0 C5 PV1 D1 AmpSD D2 ...

  • Page 6

    ... 3. 3.6V 20Hz – 20kHz DD Inputs to AC GND, A weighted 5 ≤ ≤ −40° MAX ≤ ≤ 2.4V ≤ 3. 1kHz, unless otherwise specified. Limits IN LM48520 Typical Limit (Note 6) (Notes 7, 8) 14.8 11.5 15.5 8.0 0.04 1.0 1.4 0 1.1 0.87 1.3 0.04 32 www.national.com 40.5 °C/W ≤ +85°C A ≤ 5.0V DD ≤ ...

  • Page 7

    ... 4.2V DD (Note 11) = 8Ω 2V, R limit 8/3 (PV1 – 2V out clipped ) / θ − the given in Absolute Maximum Ratings, whichever is lower LM48520 Typical Limit (Note 6) (Notes 217Hz 2.5 3.2 ) limit , θ , and the ambient temperature, T JMAX ...

  • Page 8

    Typical Performance Characteristics THD+N vs Frequency V = 2.7V 800mW OUT THD+N vs Frequency V = 5.0V 1W OUT THD+N vs Output Power = 8Ω 3.3V ...

  • Page 9

    Power Dissipation vs Output Power = 8Ω 1kHz V = 2.7V Power Dissipation vs Output Power = 8Ω 1kHz V = 5.0V Efficiency vs Output Power = 8Ω ...

  • Page 10

    CMRR vs Frequency = 8Ω V =3.3V RIPPLE P-P L Supply Current vs Supply Voltage No Load 20198724 Boost Output Voltage vs Load Current V = 2.7V DD PSRR vs Frequency V =3.3V, V ...

  • Page 11

    Boost Output Voltage vs Load Current V = 5.0V DD www.national.com 20198728 10 ...

  • Page 12

    ... PV1, V1 and V as close to the device as possible. SELECTING INPUT CAPACITOR FOR AUDIO AMPLIFIER Input capacitors the LM48520 forms a high pass filter that removes the DC bias from an incoming signal. The AC-coupling capacitor al- lows the amplifier to bias the signal to an optimal DC level. (W) ...

  • Page 13

    ... Larger inductors also mean more load power can be delivered because the energy stored during each switching cycle is: Where “lp” is the peak inductor current. The LM48520 will limit its switch current based on peak current. With I creasing L will increase the maximum amount of power avail- able to the load ...

  • Page 14

    ... SW traces to prevent the noise from injecting into the input. 4. The power supply bypass capacitors, Cs1 and Cs2 should be placed as close to the LM48520 device as possible. GROUNDING GUIDELINES There are three grounds on the LM48520, GND, SW_GND, and PGND. When laying out the PCB critical to connect the grounds as close to the device as possible ...

  • Page 15

    ... Output Speaker Protection Function The LM48520’s output voltage limiter can be used to set a minimum and maximum output voltage swing magnitude. The voltage applied to the VLimit pin controls the limit on the out- put voltage level. The output level is determined by the fol- lowing equation: Vout clipped = 8/3 * (PV1 — ...

  • Page 16

    Revision History Rev Date 1.0 02/27/08 1.01 03/07/08 1.02 03/12/08 Description Initial release. Added the Soft clipping vs No clipping curve. Text edits. 15 www.national.com ...

  • Page 17

    ... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted micro SMD Package Order Number LM48520TL NS Package Number TLA25AAA X1 = 2.49mm 2.49mm 0.6mm, 16 ...

  • Page 18

    Notes 17 www.national.com ...

  • Page 19

    For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators ...

  • Page 20

    ... 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’ ...