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tên linh kiện TAS5441-Q1
Giải thích chi tiết về linh kiện  TAS5441-Q1 22-W Analog Input 1-Channel Automotive Class-D Audio Amplifier with Load Dump and I2C Diagnostics
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TAS5441-Q1
SLOSE41 – APRIL 2020
www.ti.com
Product Folder Links: TAS5441-Q1
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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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