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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TS4621ML датащи(PDF) 26 Page - STMicroelectronics |
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TS4621ML датащи(HTML) 26 Page - STMicroelectronics |
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26 / 40 page  Application information TS4621ML 26/40 Doc ID 023181 Rev 1 audio band DC/DC switching frequency keeps the audio quality at a high level (distortion, noise, etc…). Figure 65. Efficiency comparison Most audio signals have a crest factor higher than 6 dB (10 dB on average), which means that most of the time the music level is low. In this case, the setting of the internal DC/DC converters is low (1.2 V) and in this way, helps to minimize the power dissipation. When the audio signal amplitude increases due to a peak or louder music, the setting of the internal DC/DC converters increases to 1.9 V, automatically increasing the output dynamic range. This 1.9 V value remains until the end of the decay time. Figure 66 shows a music sample played at high levels. Figure 66. Class-G operating with a music sample Note: HPVDD/PVSS voltages are created internally by DC/DC converters. To avoid destruction of the TS4621ML power amplifier, do not connect any external power supply on these pins. 0.1 1 10 0.1 1 10 100 TS4601 Class AB TS4621ML Class G Both channels enabled RL = 32 Ω, F = 1KHz Vcc = 3.6V, Ta = 25 C Crest Factor = 3dB Total Output Power (mW) HPVDD High 1.9V HPVDD Low 1.2V PVSS Low -1.2V PVSS High -1.9V Music Sample |
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