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MP1720DH-216 Datasheet(PDF) 11 Page - Monolithic Power Systems |
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MP1720DH-216 Datasheet(HTML) 11 Page - Monolithic Power Systems |
11 / 14 page MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER MP1720 Rev. 1.01 www.MonolithicPower.com 11 8/9/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. APPLICATION INFORMATION COMPONENT SELECTION The MP1720 uses a minimum number of external components to complete a fully bridged Class D audio amplifier. Use the following sections to customize the amplifier for your particular application. 1) Input Coupling Capacitors (CIN) The MP1720 is a mono BTL Class-D amplifier with differential outputs and inputs. If the input signal is not biased within the recommended common-mode input range or if using a single- ended source, the input coupling capacitors are used to pass only the AC audio signal to the input of the amplifier as a high pass filter. Choose an input coupling capacitor such that the corner frequency fIN is less than the desired pass-band frequency. The formula for the corner frequency is: IN IN IN 1 f 2R C (2) RIN is 15kΩ for MP1720. Speakers in wireless handsets usually can’t respond well to low frequencies, so for this application the corner frequency can be set to block the low frequencies. The input coupling capacitance is calculated as: IN IN IN 1 C 2R f (3) If the corner frequency is within the audible band, the capacitors should have a tolerance of ±10% or better, because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below. Tantalum or aluminum electrolytic capacitor with low-voltage coefficients is recommended, or the largest package ceramics capacitor to minimize voltage coefficient effects, for example X7R dielectrics is better than Y5V or Z5U. 2) Power Supply Decoupling Capacitor (CS) The class-D audio amplifier requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (THD+N) is low. To carry the higher frequency transient current, spikes, or digital hash on the line, a good low ESR ceramic capacitor is necessary. Place a 1μF decoupling capacitor as close as possible to the device VCC lead. It is very important for the efficiency of the class-D amplifier, because any resistance or inductance in the trace between the capacitor and the device may cause a loss. A 10μF or greater capacitor placed near the audio power amplifier would also help for filtering lower- frequency noise |
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