21ics Diodes Incorporated, a manufacturer of LCD, integrated PC and video projectors, introduced the 3W stereo Class D audio amplifier and the Class AB headphone driver PAM8009. This amplifier features power limiting technology that protects the speaker and advanced DC volume control for precise sixty-four gain adjustment. It minimizes the number of external components and provides a highly integrated solution in a compact twenty-pin QFN or twenty-four-pin SOP package.
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The PAM8009 provides up to 2.4W of output power rating per channel to drive a 4Ω bridged speaker load at 1% total harmonic distortion (THD+N); up to 10% total harmonic distortion 3W. The device is capable of driving the general internal small speakers of such applications at low cost and high power. The stand-alone audio interface drives a 60mW power-output stereo headphone in a single-ended mode to achieve a 32Ω load, and the hysteresis DC volume control provides precise sixty-four gain adjustment from -80dB to +20dB. Automatic gain control and undervoltage protection effectively prevent the speaker from being damaged by output clipping and turn off the amplifier before the input device produces brownout noise.
The PAM8009 operates from a 2.8V to 5.5V supply and consumes 7mA of quiescent current from a 5V supply. The device integrates thermal and overcurrent protection into a self-healing function and uses a power-enhanced package to reduce power consumption. The mute pin speeds up the turn-off of the speaker and headphone outputs and also helps save power. To further reduce power consumption, the product's shutdown mode turns off the amplifier's bias current.
The new products are available in 1,000-piece quantities and are available in SOP-24 and QFN4040-20 package options. For further product information, please visit
The main function of the Solar Energy Storage System is to store the electrical energy generated by the solar panels so that it can continue to supply electricity when the solar panels cannot generate electricity or when the demand for electricity exceeds the supply of the solar panels. It is an energy storage solution for improving the self-sufficiency and energy efficiency of solar power generation systems.
Main effect:
Energy Storage: The Solar Energy Storage System uses batteries to store excess electricity generated by solar panels. When solar panels generate more power than needed, the excess power is stored in batteries to continue supplying power when needed.
Power supply backup: When the solar panels cannot generate enough power, such as at night, in cloudy, or in bad weather, the Solar Energy Storage System can use the stored power to continue to supply power to ensure the continuity and stability of the power supply.
Energy Balance: The Solar Energy Storage System helps to balance the energy difference between the electricity generated by solar panels and the electricity demanded, thus optimizing energy management and maximizing self-sufficiency.
Differences from other energy storage systems:
Power source: The power source of the Solar Energy Storage System is a Solar Panel, which directly generates electricity by converting sunlight. While other energy storage systems may come from other renewable energy sources, such as wind energy, hydro energy, or non-renewable energy sources, such as grid electricity.
Renewability: The Solar Energy Storage System uses solar energy as a power source and is a renewable energy system. Other energy storage systems may utilize different types of energy sources, with varying degrees of renewability.
Application scenarios: Solar Energy Storage System is mainly used in photovoltaic power generation systems, especially in conjunction with solar panels. Other energy storage systems can be used in different energy generation systems, selected according to specific energy sources and application requirements.
Overall, the main function of the Solar Energy Storage System is to store the electrical energy generated by the solar panels for continued power supply at night or when the solar panels are unable to generate electricity. Compared with other energy storage systems, it uses solar energy as a power source, is a renewable energy system, and is mainly used in photovoltaic power generation systems to improve energy utilization efficiency and self-sufficiency.
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