ZHCSAA4B September 2012 – September 2015 TPA3110D2-Q1
PRODUCTION DATA.
- 1 特性
- 2 應(yīng)用
- 3 說(shuō)明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 TPA3110D2-Q1 Modulation Scheme
- 8.2.2.2 Ferrite Bead Filter Considerations
- 8.2.2.3 Efficiency: LC Filter Required With the Traditional Class-D Modulation Scheme
- 8.2.2.4 When to Use an Output Filter for EMI Suppression
- 8.2.2.5 Input Resistance
- 8.2.2.6 Input Capacitor, CI
- 8.2.2.7 BSN and BSP Capacitors
- 8.2.2.8 Differential Inputs
- 8.2.2.9 Using Low-ESR Capacitors
- 8.2.3 Application Curve
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機(jī)械、封裝和可訂購(gòu)信息
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- PWP|28
散熱焊盤(pán)機(jī)械數(shù)據(jù) (封裝 | 引腳)
- PWP|28
訂購(gòu)信息
8.2.2.6 Input Capacitor, CI
In the typical application, an input capacitor (CI) is required to allow the amplifier to bias the input signal to the proper 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.
The value of CI is important, as it directly affects the bass (low-frequency) performance of the circuit. Consider the example where ZI is 60 kΩ and the specification calls for a flat bass response down to 20 Hz. Equation 3 is reconfigured as Equation 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. If the gain is known and is constant, use ZI from Table 2 to calculate CI. A further consideration for this capacitor is the leakage path from the input source through the input network (CI) and the feedback network to the load. This leakage current creates a DC offset voltage at the input to the amplifier that reduces useful headroom, especially in high gain applications. For this reason, a low-leakage tantalum or ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most applications as the DC level there is held at 3 V, which is likely higher than the source DC level. Note that it is important to confirm the capacitor polarity in the application. Additionally, lead-free solder can create DC offset voltages and it is important to ensure that boards are cleaned properly.