Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Audio amplifier 1-channel (mono) Class D WSON 10 (3x3)

LM48310

www.ti.com

SNAS430D –NOVEMBER 2007–REVISED MAY 2013

LM48310 Ultra-Low EMI, Filterless, 2.6W, Mono, Class D

Audio Power Amplifier with E

Check for Samples: LM48310

FEATURES

DESCRIPTION

The LM48310 is a single supply, high efficiency,

• Passes FCC Class B Radiated Emissions with

mono, 2.6W, filterless switching audio amplifier. The

20 inches of cable

LM48310 features TI’s Enhanced Emissions

• E

S System Reduces EMI while Preserving

Suppression (E

S) system, that features a unique

Audio Quality and Efficiency

patent-pending ultra low EMI, spread spectrum, PWM

architecture, that significantly reduces RF emissions

• Output Short Circuit Protection with Auto-

while preserving audio quality and efficiency. The E

Recovery

system improves battery life, reduces external

• Stereo Class D Operation

component count, board area consumption, system

• No Output Filter Required

cost, and simplifying design.

• Internally Configured Gain (12dB)

The LM48310 is designed to meet the demands of

• Synchronizable Oscillator for Multi-Channel

portable multimedia devices. Operating from a single

Operation

5V supply, the device is capable of delivering 2.6W of

continuous output power to a 4Ω load with less than

• Low Power Shutdown Mode

10% THD+N. Flexible power supply requirements

• Minimum External Components

allow operation from 2.4V to 5.5V. The LM48310

• "Click and Pop" Suppression

offers two logic selectable modulation schemes, fixed

frequency mode, and an EMI suppressing spread

• Micro-Power Shutdown

spectrum mode. The E

S system includes an

• Available in Space-Saving WSON Package

advanced, patent-pending edge rate control (ERC)

architecture that further reduce emissions by

APPLICATIONS

minimizing the high frequency component of the

device output, while maintaining high quality audio

• Mobile Phones

reproduction (THD+N = 0.03%) and high efficiency (η

• PDAs

= 88%). The LM48310 also features a SYNC_IN input

• Laptops

and SYNC_OUT, which allows multiple devices to

operate with the same switching frequency,

KEY SPECIFICATIONS

eliminating beat frequencies and any other

interference caused by clock intermodulation.

• Efficiency at 3.6V, 400mW into 8Ω 85% (typ)

The LM48310 features high efficiency compared to

• Efficiency at 5V, 1W into 8Ω 88% (typ)

conventional Class AB amplifiers, and other low EMI

• Quiescent Power Supply Current at 5V 3.2mA

Class D amplifiers. When driving and 8Ω speaker

• Power Output at V

= 5V, R

= 4Ω, THD+N ≤

from a 5V supply, the device operates with 88%

10% 2.6W (typ)

efficiency at P

= 1W. The gain of the LM48310 is

internally set to 12dB, further reducing external

• Power Output at V

= 5V, R

= 8Ω, THD+N ≤

component count. A low power shutdown mode

10% 1.6W (typ)

reduces supply current consumption to 0.01μA.

• Shutdown current0.01μA (typ)

Advanced output short circuit protection with auto-

recovery prevents the device from being damaged

during fault conditions. Superior click and pop

suppression eliminates audible transients on power-

up/down and during shutdown.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (22 pages)

PAGE 1
LM48310 www.ti.com LM48310 SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 Ultra-Low EMI, Filterless, 2.6W, Mono, Class D Audio Power Amplifier with E2S Check for Samples: LM48310 FEATURES DESCRIPTION • The LM48310 is a single supply, high efficiency, mono, 2.6W, filterless switching audio amplifier.
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LM48310 SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 www.ti.com EMI Graph 20in of Speaker Cable 60.0 AMPLITUDE (dBPV/m) 50.0 40.0 30.0 20.0 10.0 30.0 200.0 100.0 400.0 300.0 600.0 500.0 800.0 700.0 1000.0 900.0 FREQUENCY (MHz) Typical Application +2.4V to +5.5V CS CS VDD PVDD SD CIN IN+ OUTA MODULATOR HBRIDGE IN- OUTB CIN SYNC_IN SYNC_OUT OSCILLATOR GND Figure 1.
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LM48310 www.ti.com SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 Connection Diagram IN+ 1 10 OUTA IN- 2 9 PVDD VDD 3 8 GND SD 4 7 OUTB SYNC_IN 5 6 SYNC_OUT Figure 2. WSON Package - Top View See Package Number DSC0010 PIN DESCRIPTIONS Pin Name 1 IN+ Non-Inverting Input Description 2 IN- Inverting Input 3 VDD Power Supply 4 SD Active Low Shutdown Input. Connect to VDD for normal operation. 5 SYNC_IN Mode Select and External Oscillator Input.
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LM48310 SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) (2) (3) Supply Voltage 6.0V −65°C to +150°C Storage Temperature − 0.3V to VDD +0.3V Input Voltage Power Dissipation (4) ESD Rating Internally Limited (5) 2000V ESD Rating (6) 200V Junction Temperature 150°C Thermal Resistance (1) (2) (3) (4) (5) (6) θJC 8.2°C/W θJA 49.
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LM48310 www.ti.com SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 ELECTRICAL CHARACTERISTICS VDD = PVDD = 5V(1)(2) (continued) The following specifications apply for AV = 12dB, (RL = 8Ω, SYNC_IN = VDD (Spread Spectrum mode), f = 1kHz, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter VIL Logic Input Low Voltage TWU Wake Up Time fSW Switching Frequency Conditions LM48310 Typical (3) SD input, VDD = 3.6V Limit (4) (2) Units (Limits) 0.4 V (max) 7.
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LM48310 SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS THD+N vs Frequency VDD = 3.6V, POUT = 700mW, RL = 4Ω 100 100 10 10 THD+N (%) THD+N (%) THD+N vs Frequency VDD = 2.5V, POUT = 300mW, RL = 4Ω 1 0.1 0.01 0.001 100 1000 10000 100000 10 100 1000 10000 100000 FREQUENCY (Hz) FREQUENCY (Hz) Figure 3. Figure 4. THD+N vs Frequency VDD = 5.0V, POUT = 1.2W, RL = 4Ω THD+N vs Frequency VDD = 2.
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LM48310 www.ti.com SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) THD+N vs Output Power f = 1kHz, RL = 4Ω THD+N vs Output Power f = 1kHz, RL = 8Ω 100 100 VDD = 5V VDD = 5V 10 VDD = 3.6V VDD = 2.5V 1 0.1 VDD = 2.5V 1 0.1 0.01 0.001 0.01 0.1 1 0.01 0.001 10 0.01 0.1 1 OUTPUT POWER (W) OUTPUT POWER (W) Figure 9. Figure 10.
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LM48310 SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Output Power vs Supply Voltage f = 1kHz, RL = 4Ω Output Power vs Supply Voltage f = 1kHz, RL = 8Ω 3.5 2 2.5 THD+N = 10% 2 1.5 THD+N = 1% 1 1.5 OUTPUT POWER (W) OUTPUT POWER (W) 3 THD+N = 10% 1 THD+N = 1% 0.5 0.5 0 2.5 3 3.5 4 4.5 5 0 2.5 5.5 4 4.5 5 5.5 Figure 15. Figure 16. PSRR vs Frequency VDD = 3.6V, VRIPPLE = 200mVP-P, RL = 8Ω PSRR vs Frequency VDD = 5.
PAGE 9
LM48310 www.ti.com SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Spread Spectrum Output Spectrum vs Frequency VDD = 5.0V, VIN = 1VRMS, RL = 8Ω 0 0 -20 -20 AMPLITUDE (dBV) AMPLITUDE (dBV) Fixed Frequency Output Spectrum vs Frequency VDD = 5.0V, VIN = 1VRMS, RL = 8Ω -40 -60 -80 -100 -60 -80 -100 -120 10 100 1000 10000 -120 10 100000 100 1000 10000 100000 FREQUENCY (Hz) FREQUENCY (Hz) Figure 21. Figure 22.
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LM48310 SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 www.ti.com APPLICATION INFORMATION GENERAL AMPLIFIER FUNCTION The LM48310 mono Class D audio power amplifier features a filterless modulation scheme that reduces external component count, conserving board space and reducing system cost. With no signal applied, the outputs (VOUTA and VOUTB) switch between VDD and GND with a 50% duty cycle, in phase, causing the two outputs to cancel.
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LM48310 www.ti.com SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 VDD 1 PF VDD PVDD U1 LM48310 IN+ OUTA RIGHT CHANNEL DIFFERENTIAL AUDIO INPUT OUTB IN- SYNC_IN SYNC _OUT VDD PVDD 1 PF U2 LM48310 IN+ OUTA LEFT CHANNEL DIFFERENTIAL AUDIO INPUT OUTB IN- SYNC_IN Figure 27. Cascaded LM48310 100 100 10 THD+N (%) THD+N (%) 10 1 SLAVE 1 SLAVE 0.1 0.1 0.01 MASTER MASTER 0.01 0.001 0.01 0.1 1 0.001 10 10 OUTPUT POWER (W) 100 1000 10000 100000 FREQUENCY (Hz) Figure 28.
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LM48310 SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 www.ti.com 0 CROSSTALK (dB) -20 -40 -60 -80 -100 -120 10 100 1000 10000 100000 FREQUENCY (Hz) Figure 30. Crosstalk vs Frequency DIFFERENTIAL AMPLIFIER EXPLANATION As logic supplies continue to shrink, system designers are increasingly turning to differential analog signal handling to preserve signal to noise ratios with restricted voltage signs. The LM48310 features a fully differential speaker amplifier.
PAGE 13
LM48310 www.ti.com SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 AUDIO AMPLIFIER INPUT CAPACITOR SELECTION Input capacitors may be required for some applications, or when the audio source is single-ended. Input capacitors block the DC component of the audio signal, eliminating any conflict between the DC component of the audio source and the bias voltage of the LM48310. The input capacitors create a high-pass filter with the input resistors RIN.
PAGE 14
LM48310 SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 www.ti.com VDD 1 PF VDD PVDD LM48310 SINGLE-ENDED AUDIO INPUT INOUTA OUTB IN+ Figure 32. Single-Ended Input Configuration PCB LAYOUT GUIDELINES As output power increases, interconnect resistance (PCB traces and wires) between the amplifier, load and power supply create a voltage drop. The voltage loss due to the traces between the LM48310 and the load results in lower output power and decreased efficiency.
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LM48310 www.ti.com SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 LM48310 Demo Board Schematic PVDD 3 + GND PVDD U1 VDD C1 10 PF VDD PVDD 9 C3 1 PF C2 1 PF PGND 8 IN+ GND OUTA C4 1 IN+ OUTA IN- OUTB 10 1 PF IN- OUTB C5 2 7 1 PF VDD JU1 1 4 2 SD VDD 3 GND JU2 1 2 5 SYNC_IN SYNC_OUT 6 0 3 GND SYNC_IN LM48310SD SYNC_OUT R1 C6 OPEN GND Figure 33. LM48310 DEMO BOARD SCHEMATIC Demo Boards Figure 34. Top Silkscreen Figure 35.
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LM48310 SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 16 www.ti.com Figure 36. Layer 2 (GND) Figure 37. Layer 3 (VDD ) Figure 38. Bottom Layer Figure 39.
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LM48310 www.ti.com SNAS430D – NOVEMBER 2007 – REVISED MAY 2013 REVISION HISTORY Rev Date 1.0 11/13/07 Initial release. Description 1.01 02/26/08 Fixed few typos (Pin Description table). 1.02 03/04/08 Text edits under SHUTDOWN FUNCTION (Application Information section). 1.03 06/24/09 Text edits. Changes from Revision C (May 2013) to Revision D • Page Changed layout of National Data Sheet to TI format ..........................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-May-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM48310SD/NOPB WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM48310SDX/NOPB WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-May-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM48310SD/NOPB WSON DSC 10 1000 210.0 185.0 35.0 LM48310SDX/NOPB WSON DSC 10 4500 367.0 367.0 35.
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