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LC823450 Datasheet(PDF) 97 Page - ON Semiconductor |
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LC823450 Datasheet(HTML) 97 Page - ON Semiconductor |
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97 / 112 page  LC823450 www.onsemi.com 97 Class−D AMP Figure 46. Class−D AMP Ipp(Irms) L C Headphone L−ch LOUT Rd + This LSI Mut e Nch Power FET ROUT Power L C Mut e Ipp(Irms) Headphone R−ch Rd + 0.22 μF 10 k Ω 16 Ω 16 Ω 220 μF 220 μΗ 0 ∼ 10 Ω 0.22 μF 220 μF 220 μΗ 0 ∼ 10 Ω 10 k Ω 220 μF or more 0.1 μF AVSSDAMPR AVDDDAMPR AVSSDAMPL AVDDDAMPL 87. Add the bypass condenser (0.1 μF) between AVDDDAMPL and AVSSDAMPL, AVDDDAMPR and AVSSDAMPR as close as possible to terminals 88. Add the large electrolyte capacitor (220 μF or more recommended) to AVDDDAMPL, AVDDDAMPR terminal to reject the noise and reduce the pumping phenomenon of Class−D AMP. 89. Check the voltage level of AVDDDAMPL, AVDDDAMPR and make sure not to exceed 1.65 V (recommended operating voltage) by using playback of 20 Hz, 0db (full scale) sin wave 90. Add the bypass condenser (0.1 μF) between AVDDDAMPL and AVSSDAMPL, AVDDDAMPR and AVSSDAMPR as close as possible to terminals 91. Add the large electrolyte capacitor (220 μF or more recommended) to AVDDDAMPL, AVDDDAMPR terminal to reject the noise and reduce the pumping phenomenon of Class−D AMP. 92. Check the voltage level of AVDDDAMPL, AVDDDAMPR and make sure not to exceed 1.65 V (recommended operating voltage) by using playback of 20 Hz, 0db (full scale) sin wave Output power calculation [ condition ] • The DC resistance element of the coil, capacitor is small • Maximum output amplitude = 90% (Theoretical Value of Delta−sigma Circuit) to power supply of PWM • Class−D AMP power supply (AvDDDAMPL, AVDDDAMPR) = 1.2 V • Class−D AMP Turning on resistance of internal transistor(Ron) = 2 Ω • Headphone load resistance(RL) = 15 Ω • Series resistance(Rd) = 0 Ω Assume the current that flows to the headphone to be Ipp: Ipp = (1200 / 2) × 0.9 / (15 + 2) = 31.7 (mA) Irms = Ipp / SQRT(2) = 22.4 (mA) Prms = Irms ^ 2 × 15 = 7.53 (mW) Power Supply Class−D AMP power supply to (AVDDDAMPL, AVDDDAMPR) must use a transient response and good power supply. When the power supply where the transient response is bad is used and the capacity of the capacitor is small, a peculiar pumping phenomenon to Class−D AMP is generated. The power supply voltage must not exceed the recommended operating range when the pumping phenomenon occurs. Class−D AMP output is PWM. The power supply noise affects the output of Class−D AMP. Power sources which have large internal impedance such as dry cell should not be directly connected to power supply of Class−D AMP, and those which have large switching noise such as switching regulator are not suitable and need to be taken care of. |
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