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Ë 2 The System reduces EMI and maintains audio quality and efficiency
- Output short-circuit protection
- Stereo Class D operation
- No output filter inductive load required
- Logic selects gain
- Independent shutdown control
- Minimal external components
- "Click" sound suppression circuit
- Micropower shutdown mode
- Available in a space-saving 0.5mm pitch micro SMD package
illustrate
The LM48411 is a single-supply, high efficiency, 2.5W/channel Class-D audio amplifier. The LM48411 of the state features enhanced emission suppression (E 2 S) system, i.e. using a unique patent-pending ultra-low EMI, spread spectrum, PWM architecture, significantly reduces RF emissions while maintaining audio quality and efficiency. My E 2 The S system increases battery life, reduces the number of external components, board area consumption, system cost, and simplifies design.
The LM48411 is designed to meet the needs of mobile phones and other portable communication devices. Operating from a single 5V supply, it is delivering less than 10% THD+N of continuous output power from 2.5W/channel to 4Ω load capability Its flexible power requirements allow operation from 2.4V to 5.5V. The wideband-propagated LM48411 spectrum architecture reduces EMI radiated emissions due to modulator frequency.
The LM48411 has higher efficiency than conventional Class AB amplifiers. My E 2 The S system includes an advanced, patent-pending edge rate control (ERC) architecture that further reduces emissions of the device's output high-frequency components while maintaining high-quality audio and high efficiency (η = 87% in V).DD= 3.6 V，PO= 500MW）。 The fourth is pin-selectable gain options through GAIN0 and gain 1 pin.
The LM48411 has a low-power shutdown mode. Shutdown enables the drive shutdown pin to be logic low (GND).
Output short-circuit protection prevents damage to the device under fault conditions. Superior click and ejection suppression eliminates power on/down and off when sound transients. Independent left/right shutdown control maximizes power savings for hybrid mono/stereo applications.
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 at 5V is 8Ω1W 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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■ The output power is in VDD= 5V RL =4Ω，THD ≤ 10％
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2.5W (typical)
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■ The output power is in VDD= 5V RL =8Ω，THD ≤ 10％
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1.5W (typical)
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■ Power off together 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
- mobile phone
- Pocket PC
- Portable electronic devices
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