 peculiarity
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Ë 2 The S-system reduces electromagnetic interference and maintains audio quality and efficiency
- Output short-circuit protection
- Stereo Class D operation
- No output filter required for inductive loads
- Logic selects gain
- Independent shutdown control
- Minimal external components
- "Click" suppression circuit
- Micropower shutdown mode
- Energy-saving 0.5mm pitch micro SMD package in available space
illustrate
The LM48411 is a single-supply, high efficiency, 2.5W/channel Class D audio amplifier. Enhanced LM48411 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 LM48411 is designed to meet the needs of mobile phones and other portable communication devices. A 5V supply capable of delivering less than 10% THD + N 2.5W/channel of continuous output power into a 4Ω load Its flexible power requirements allow operation from 2.4V to 5.5V. The LM48411 architecture of the wideband propagation spectrum reduces EMI emissions due to the frequency of the modulator.
The LM48411 has high efficiency compared to conventional Class AB amplifiers. My E 2 The System S includes an advanced, patent-pending edge rate control (ERC) architecture that further reduces emissions and minimizes the high-frequency content of the device's output while maintaining high-quality audio reproduction and high efficiency (η = 87%)atV DD = 3.6 five，PO = 500MW）。 Four gain options, GAIN0 and gain 1 pins, are pin-selectable.
The LM48411 has a low-power shutdown mode. Shutdown enables the drive shutdown pin to be logic low (GND).
Output short-circuit protection against damage to the device under fault conditions. Advanced click suppression eliminates audible transient noise when powering up/down and shutting down. Independent left/right shutdown control hybrid mono/stereo applications maximize power savings.
Main specifications
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■ At 3.6V, 500mW has an efficiency of 8Ω loudspeaker
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87% (typical)
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■ At 3.6V, 100mW has an efficiency of 8Ω loudspeaker
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80% (typical)
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■ The efficiency is 8Ω1W at 5V loudspeaker
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88% (typical)
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■ Quiescent current, 3.6V supply
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4.2 mA (typical)
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■ Power output in VDD= 5V RL = 4Ω, total harmonic distortion ≤ 10％
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2.5W (typical)
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■ Power output in VDD= 5V RL = 8Ω, total harmonic distortion ≤ 10％
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1.5W (typical)
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■ Turn off the main power presently
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0.01μA (typical)
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■ Single supply voltage range
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2.4V to 5.5V
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apply
- cell phone
- Pocket PC
- Portable electronic devices
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