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## TPA3110D2-Q1 Datasheet(PDF) 23 Page - Texas Instruments

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 Part # TPA3110D2-Q1 Description Filter-Free Stereo Class-D Audio Power Amplifier Download 36 Pages Scroll/Zoom 100% Manufacturer TI1 [Texas Instruments] Direct Link http://www.ti.com Logo

## TPA3110D2-Q1 Datasheet(HTML) 23 Page - Texas Instruments

 23 / 36 pageC =i12Z fpicf=c12Z Cpii-3dBfcf=12Z CpiiCiINZiZfInputSignalTPA3110D2-Q1www.ti.comSLOS794B – SEPTEMBER 2012 – REVISED SEPTEMBER 2015Typical Application (continued)8.2.2.5 Input ResistanceChanging the gain setting can vary the input resistance of the amplifier from its smallest value, 9 kΩ ±20%, to thelargest value, 60 kΩ ±20%. As a result, if a single capacitor is used in the input high-pass filter, the –3 dB orcutoff frequency may change when changing gain steps.The –3-dB frequency can be calculated using Equation 2. Use the ZI values given in Table 2.(2)8.2.2.6 Input Capacitor, CIIn the typical application, an input capacitor (CI) is required to allow the amplifier to bias the input signal to theproper DC level for optimum operation. In this case, CI and the input impedance of the amplifier (ZI) form a high-pass filter with the corner frequency determined in Equation 3.(3)The value of CI is important, as it directly affects the bass (low-frequency) performance of the circuit. Considerthe example where ZI is 60 kΩ and the specification calls for a flat bass response down to 20 Hz. Equation 3 isreconfigured as Equation 4.(4)In this example, CI is 0.13 µF; so, one would likely choose a value of 0.15 μF as this value is commonly used. Ifthe gain is known and is constant, use ZI from Table 2 to calculate CI. A further consideration for this capacitor isthe leakage path from the input source through the input network (CI) and the feedback network to the load. Thisleakage current creates a DC offset voltage at the input to the amplifier that reduces useful headroom, especiallyin high gain applications. For this reason, a low-leakage tantalum or ceramic capacitor is the best choice. Whenpolarized capacitors are used, the positive side of the capacitor should face the amplifier input in mostapplications as the DC level there is held at 3 V, which is likely higher than the source DC level. Note that it isimportant to confirm the capacitor polarity in the application. Additionally, lead-free solder can create DC offsetvoltages and it is important to ensure that boards are cleaned properly.8.2.2.7 BSN and BSP CapacitorsThe full H-bridge output stages use only NMOS transistors. Therefore, they require bootstrap capacitors for thehigh side of each output to turn on correctly. A 0.22-μF ceramic capacitor, rated for at least 25 V, must beconnected from each output to its corresponding bootstrap input. Specifically, one 0.22-μF capacitor must beconnected from OUTPx to BSPx, and one 0.22-μF capacitor must be connected from OUTNx to BSNx. (See theapplication circuit diagram in TPA3110D2-Q1 Simplified Application Schematic .)Copyright © 2012–2015, Texas Instruments IncorporatedSubmit Documentation Feedback23Product Folder Links: TPA3110D2-Q1

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