Fiber Laser Marking Machine is a new generation of laser marking system developed by our company using the advanced laser technology. It uses the fiber laser to output laser, and then the marking function is realized by the high-speed scanning galvanometer system. The optical conversion efficiency of fiber laser marking is high, reaching more than 30%. It is cooled by air cooling, the whole machine is small in size, the output beam quality is good, and the reliability is high.
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The LM4953 is an audio amplifier that can drive a ceramic speaker with a charge pump, requiring only eight external components. The LM4953 is available in a 3mm x 4mm package, but with an audio amplifier and charge pump built in, it can boost the 3.6V supply voltage and provide a peak-to-peak voltage of up to 12.6V for a 2uF + 30W bridge load. Wave distortion and noise will not exceed 1%.
Both speaker drivers feature a low-power shutdown mode and internal thermal shutdown protection without the need for a startup capacitor or transient voltage suppression circuit, as well as a “switch/switch†noise suppression circuit. Their unity gain is very stable and can be configured with an external gain setting resistor.
The optical system adopts a fully sealed structure with a red light preview function, which has a more beautiful appearance and more convenient operation;
High photoelectric conversion efficiency, high beam quality, fine lines and small spots;
It adopts air-cooling method for cooling, which has low energy consumption.
National Semiconductor introduced two audio amplifiers for ceramic speakers
The LM4962 is 5mm x 5mm and has a built-in boost converter that drives the capacitive load of the ceramic speaker and also drives the stereo speakers. In addition, the chip has an audio power amplifier that supports mono ceramic speakers. It uses a 3.2V DC power supply to provide 15V peak-to-peak voltage for bridged loads (BTL) without total harmonic distortion and noise (THD+N) of more than 1%. In addition, the LM4962 chip features overcurrent protection and overvoltage protection to protect the boost converter. The built-in DC/DC converter features a soft-start function.