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NCP2821 датащи(PDF) 17 Page - ON Semiconductor |
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NCP2821 датащи(HTML) 17 Page - ON Semiconductor |
17 / 19 page NCP2821 http://onsemi.com 17 PCB Layout Information NCP2821 is suitable for low cost solution. In a very small package it gives all the advantages of a Class−D audio amplifier. The required application board is focused on low cost solution too. Due to its fully differential capability, the audio signal can only be provided by an input resistor. If a low pass filtering function is required, then an input coupling capacitor is needed. The values of these components determine the voltage gain and the bandwidth frequency. The battery positive supply voltage requires a good decoupling capacitor versus the expected distortion. When the board is using Ground and Power planes with at least 4 layers, a single 4.7 mF filtering ceramic capactior on the bottom face will give optimized performance. A 1.0 mF low ESR ceramic capacitor can also be used with slightly degraded performances on the THD+N from 0.06% up to 0.2%. In a two layers application, if both Vp pins are connected on the top layer, a single 4.7 mF decoupling capacitor will optimize the THD+N level. The NCP2821 power audio amplifier can operate from 2.5 V until 5.5 V power supply. With less than 2% THD+N, it delivers 500 mW rms output power to a 8.0 W load at Vp =3.0 V and 1.0 W rms output power at Vp = 4.0 V. Figure 47. Top Layer Note: This track between Vp pins is only needed when a 2 layers board is used. In case of a typical 4 or more layers, the use of laser vias in pad will optimize the THD+N floor. The demonstration board delivered by ON Semiconductor is a 4 Layers with Top, Ground, Power Supply and Bottom. Note |
Аналогичный номер детали - NCP2821 |
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Аналогичное описание - NCP2821 |
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