- Pass FCC Class B radiation with 20-inch cable emissions
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Ë 2 The system maintains audio quality and efficiency while reducing EMI
- Output short-circuit protection, automatic recovery
- No output filter is required
- Internally Configurable Gain (6dB)
- Low-power shutdown mode
- Minimal external components
- "Click" repression
- Micropower shutdown
- Space-saving microSMD package
illustrate
The LM48311 is a single-supply, high efficiency, mono, 2.6W, filter-free switching audio amplifier. Enhanced LM48311 function of national emission suppression (E 2 S) System, i.e. boasting a unique patent-pending ultra-low EMI, spread spectrum PWM structure that significantly reduces RF emissions while preserving audio quality and efficiency. My E 2 S-system, improve battery life, reduce external component count, board area consumption, system cost, and simplify design.
The LM48311 is designed to meet the needs of portable multimedia devices. The device operates from a single 5V supply and is capable of delivering less than 10% THD+N of 2.6W of continuous output power into a 4Ω load Flexible power requirements allow operation from 2.4V to 5.5V. The LM48311 features a spread spectrum modulation scheme, as well as an advanced, patented Edge Rate Control (ERC) architecture that significantly reduces emissions while maintaining high quality audio reproduction (THD + N = 0.03%) and high efficiency (η = 88%).
The LM48311 features higher efficiency than traditional Class AB amplifiers, and other low EMI Class D amplifiers. When driving an 8Ω speaker and from a 5V power supply, the device operates efficiently as88％PO = 1W 。 The LM48311 has an internally programmed gain of 6dB, further reducing external component count. A low-power shutdown mode reduces supply current consumption by 0.01μA.
Advanced auto-recovery output short-circuit protection prevents damage to equipment under fault conditions. Advanced click suppression eliminates power-up/down and audible transient noise when off.
Main specifications
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■ At 3.6V, the efficiency of 400mW is 8Ω
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85% (typical)
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■ The efficiency is 8Ω1W at 5V
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88% (typical)
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■ The quiescent supply current is 5V
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3.1 mA
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■ Power output in VDD=5V，RL=4Ω THD + N ≤ 10％ THD + N ≤ 1％
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2.6W (typical) 2.1W (typical)
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■ Power output in VDD=5V，RL=8Ω THD + N ≤ 10％ THD + N ≤ 1％
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1.6W (typical) 1.3W (typical)
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■ Shutdown current
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0.01μA (typical)
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apply
- cell phone
- Pocket PC
- laptop
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