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LM48511 Datasheet(PDF) 1 Page - Texas Instruments |
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LM48511 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 28 page 30.0 1000.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 FREQUENCY (MHz) 100.0 200.0 300.0 400.0 500.0 600.0 700.0 800.0 900.0 FCC Class B Limit LM45811 EMI Spectrum Product Folder Sample & Buy Technical Documents Tools & Software Support & Community ÌLM48511 SNAS416H – JULY 2007 – REVISED AUGUST 2015 LM48511 3-W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power Amplifier With Spread Spectrum When operating from a 3-V to 4-V power supply, the 1 Features LM48511 can be configured to drive 1 to 2.5 W into 1 • 3-W Output into 8 Ω at 5 V With THD+N = 1% an 8- Ω load with less than 1% distortion (THD+N). • Selectable Spread Spectrum Mode Reduces EMI The Class D amplifier features a low-noise PWM architecture that eliminates the output filter, reducing • 80% Efficiency external component count, board area consumption, • Independent Regulator and Amplifier Shutdown system cost, and simplifying design. A selectable Controls spread spectrum modulation scheme suppresses RF • Dynamically Selectable Regulator Output Voltages emissions, further reducing the need for output filters. • Filterless Class D The switching regulator of the LM48511 is a current- • 3-V to 5.5-V Operation mode boost converter operating at a fixed frequency of 1 MHz. Two selectable feedback networks allow • Low Shutdown Current the LM48511 regulator to dynamically switch between • Click and Pop Suppression two different output voltages, improving efficiency by • Key Specifications optimizing the amplifier’s supply voltage based on battery voltage and output power requirements. – Quiescent Power Supply Current – VDD = 3 V 9 mA (Typical) The LM48511 is designed for use in portable devices, such as GPS, mobile phones, and MP3 players. The – VDD = 5 V 13.5 mA (Typical) high, 80% efficiency at 5 V, extends battery life when – PO at VDD = 5 V, PV1 = 7.8 V, RL = 8 Ω, compared to Boosted Class AB amplifiers. THD+N = 1% 3 W (Typical) Independent regulator and amplifier shutdown – PO at VDD = 3 V, PV1 = 4.8 V, RL = 8 Ω, controls optimize power savings by disabling the THD+N = 1% 1 W (Typical) regulator when high-output power is not required. – PO at VDD = 5 V, PV1 = 7.8 V, RL = 4 Ω, The gain of the LM48511 is set by external resistors, THD+N = 1% 5.4 W (Typical) which allows independent gain control from multiple sources by summing the signals. Output short circuit – Shutdown Current at VDD = 3 V, 0.01 μA and thermal overload protection prevent the device (Typical) from damage during fault conditions. Superior click and pop suppression eliminates audible transients 2 Applications during power-up and shutdown. • GPS Device Information(1) • Portable media PART NUMBER PACKAGE BODY SIZE (NOM) • Cameras LM48511 WQFN (24) 5.00 mm × 4.00 mm • Mobile Phones (1) For all available packages, see the orderable addendum at • Handheld games the end of the data sheet. 3 Description EMI Graph: LM48511 RF Emissions — 3-Inch The LM48511 device integrates a boost converter Cable with a high-efficiency Class D audio power amplifier to provide 3-W continuous power into an 8- Ω speaker when operating from a 5-V power supply. 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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