- Pass FCC Class B radiated with 20" cable discharge
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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 required
- Internal Configuration Gain (6dB)
- Low-power shutdown mode
- Minimal external components
- "Click" suppression
- Micropower shutdown
- Space-saving microSMD package
illustrate
LM48311 is a single power supply, high efficiency, mono, 2.6W, no filter-switching audio amplifier. Enhance LM48311 function National emission suppression (E 2 S) system, i.e. boasting a unique patent-pending ultra-low electromagnetic interference, spread-spectrum PWM structure that significantly reduces RF radiation while preserving audio quality and efficiency. My E 2 S system, improving battery life, reducing the number of external components, board area consumption, system cost, and simplifying design.
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 2.6W of continuous output power to a 4Ω load of less than 10% THD+N Flexible power requirements allow operation from 2.4V to 5.5V. LM48311 feature spread spectrum modulation scheme, as well as an advanced, patented Edge Rate Control (ERC) architecture, significantly reduce emissions while maintaining high-quality audio reproduction (THD + N = 0.03%) and high efficiency (η = 88%).
LM48311 functional, high 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 at an efficiency of 88%P O = 1W. The LM48311 has an internal setup gain of 6dB, further reducing the number of external components. The low-power shutdown mode can reduce the supply current consumption by 0.01μA.
Advanced auto-recovery output short-circuit protection against damage to equipment under fault conditions. Advanced click suppression eliminates audible transient noise when power-up/down and off.
Key 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 at 5V is 8Ω 1W
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88% (typical)
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■ The quiescent power supply current is at 5V
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3.1 mA
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■ Power output is in V DD = 5V, RL = 4Ω THD + N ≤ 10％ THD + N ≤ 1％
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2.6W (typical) 2.1W (typical)
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■ The power output is in V DD = 5V, RL = 8Ω THD + N ≤ 10％ THD + N ≤ 1％
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1.6W (typical) 1.3W (typical)
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■ Turn off the current
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0.01μA (typical)
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apply
- cell phone
- handheld computer
- laptop
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