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TAS5441-Q1 bảng dữ liệu(PDF) 20 Page - Texas Instruments |
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TAS5441-Q1 bảng dữ liệu(HTML) 20 Page - Texas Instruments |
20 / 28 page 20 TAS5441-Q1 SLOSE41 – APRIL 2020 www.ti.com Product Folder Links: TAS5441-Q1 Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated Typical Application (continued) 8.2.1 Design Requirements Use the following for the design requirements: • Power supplies The device requires only a single power supply compliant with the recommended operation range. The device is designed to work with either a vehicle battery or regulated power supply such as from a backup battery. • Communication The device communicates with the system controller with both discrete hardware control pins and with I2C. The device is an I2C slave and thus requires a master. If a master I2C-compliant device is not present in the system, the device can still be used, but only with the default settings. Diagnostic information is limited to the discrete reporting FAULT pin. • External components Table 9 lists the components required for the device. Table 9. Supporting Components EVM DESIGNATOR QUANITY VALUE SIZE DESCRIPTION USE IN APPLICATION C7 1 10 μF ± 10% 1206 X7R ceramic capacitor, 25-V Power supply C8 1 330 μF ± 20% 10 mm Low-ESR aluminum capacitor, 25-V Power supply C9, C16, C20 3 1 μF ± 10% 0805 X7R ceramic capacitor, 25-V Analog audio input filter, bypass C10, C14 2 0.22 μF ± 10% 0603 X7R ceramic capacitor, 25-V Bootstrap capacitors C11, C17 2 3.3 μF ± 10% 0805 X7R ceramic capacitor, 25-V Amplifier output filtering C13, C15 2 470 pF ± 10% 0603 X7R ceramic capacitor, 250-V Amplifier output snubbers C6 1 0.1 μF ± 10% 0603 X7R ceramic capacitor, 25-V Power supply C2 1 2200 pF ± 10% 0603 X7R ceramic capacitor, 50-V Power supply C3 1 0.082 μF ± 10% 0603 X7R ceramic capacitor, 25-V Power supply C4, C5 2 4.7 μF ± 10% 1206 X7R ceramic capacitor, 25-V Power supply C12, C18 2 0.01 μF ± 10% 0603 X7R ceramic capacitor, 25-V Output EMI filtering L1 1 10 μH ± 20% 13.5 mm ×13.5 mm Shielded ferrite inductor Power supply L2 1 22 μH ± 20% 8 mm × 8 mm Coupled inductor Amplifier output filtering R5, R6 2 49.9 kΩ ± 1% 0805 Resistors, 0.125-W Analog audio input filter R4, R7 2 5.6 Ω ± 5% 0805 Resistors, 0.125-W Output snubbers 8.2.1.1 Amplifier Output Filtering Output FETs drive the amplifier outputs in an H-bridge configuration. These transistors are either fully off or on. The result is a square-wave output signal with a duty cycle that is proportional to the amplitude of the audio signal. The amplifier outputs require a low-pass filter to filter out the PWM modulation carrier frequency. People frequently call this filter the L-C filter, due to the presence of an inductive element L and a capacitive element C to make up the 2-pole low-pass filter. The L-C filter attenuates the carrier frequency, reducing electromagnetic emissions and smoothing the current waveform which the load draws from the power supply. See Class-D LC Filter Design for a detailed description on proper component selection and design of an L-C filter based upon the desired load and response. 8.2.1.2 Amplifier Output Snubbers A snubber is an RC network placed at the output of the amplifier to dampen ringing or overshoot on the PWM output waveform. Overshoot and ringing has several negative impacts including: potential EMI sources, degraded audio performance, and overvoltage stress of the output FETs or board components. For more information on the use and design of output snubbers, see Class-D Output Snubber Design Guide. 8.2.1.3 Bootstrap Capacitors The output stage uses dual NMOS transistors; therefore, the circuit requires bootstrap capacitors for the high side of each output to turn on correctly. The required capacitor connection is from BSTN to OUTN and from BSTP to OUTP as shown in Figure 17. |
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