Datasheet

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APPLICATION INFORMATION
PCB Material Recommendation
PVDD Capacitor Recommendation
Decoupling Capacitor Recommendations
System Design Recommendations
GVDD(+12V)
VDD(+12V)
PVDD
PVDD
GVDD(+12V)
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
TAS5508/18
PWM1_P
PWM1_M
PWM2_P
PWM2_M
VALID
Microcontroller
I2C
10µH
100nF
50V
10µH
100nF
TAS5342DDV
GVDD_B
OTW
SD
PWM_A
RESET_AB
PWM_B
OC_ADJ
GND
AGND
VREG
M3
M2
M1
PWM_C
RESET_CD
PWM_D
GVDD_C
GVDD_D
BST_D
PVDD_D
OUT_D
GND_D
GND_C
OUT_C
PVDD_C
BST_C
BST_B
PVDD_B
OUT_B
GND_B
GND_A
VDD
GVDD_A
BST_A
PVDD_A
OUT_A
NC
NC
NC
NC
NC
PVDD_D
PVDD_A
NC
25V
33nF
100nF
50V
100nF
50V
100nF
470nF
100nF
50V
10µH
470µF
50V
470 Fµ
50V
33nF
25V
3.3 Ω
100nF
0 Ω
22k
100nF
33nF
25V
100nF
50V
10nF
50V
100nF
470nF
100nF
100nF
50V
33nF
25V
100nF
50V
100nF
10µH
3.3 Ω
10nF
50V
10nF
50V
3.3 Ω
1nF
50V
1nF
50V
1nF
50V
1nF
50V
3.3 Ω
10nF
50V
10nF
50V
3.3 Ω
3.3
Ω
10nF
50V
10 Ω
10 Ω
10 Ω
10 Ω
50V
GND
TAS5352
SLES204A – SEPTEMBER 2007 – REVISED OCTOBER 2007
FR-4 Glass Epoxy material with 2 oz. (70 μ m) is recommended for use with the TAS5352. The use of this
material can provide for higher power output, improved thermal performance, and better EMI margin (due to
lower PCB trace inductance.
The large capacitors used in conjunction with each full-birdge, are referred to as the PVDD Capacitors. These
capacitors should be selected for proper voltage margin and adequate capacitance to support the power
requirements. In practice, with a well designed system power supply, 1000 μ F, 50-V will support more
applications. The PVDD capacitors should be low ESR type because they are used in a circuit associtated with
high-speed switching.
In order to design an amplifier that has robust performance, passes regulatory requirements, and exhibits good
audio performance, good quality decoupling capacitors should be used. In practice, X7R should be used in this
application.
The voltage of the decoupling capactors should be selected in accordance with good design practices.
Temperature, ripple current, and voltage overshoot must be considered. This fact is particularly true in the
selection of the 0.1 μ F that is placed on the power supply to each half-bridge. It must withstand the voltage
overshoot of the PWM switching, the heat generated by the amplifier during high power output, and the ripple
current created by high power power output. A minimum voltage rating of 50-V is required for use with a 34.5 V
power supply.
The following schematics and PCB layouts illustrate "best practices" in the use of the TAS5352.
Figure 14. Typical Differential (2N) BTL Application With AD Modulation Filters
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