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TPA3220 Datasheet(PDF) 13 Page - Texas Instruments

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Part # TPA3220
Description  60-W Stereo, 100-W Peak HD Analog-Input, Pad-Down Class-D Amplifier
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPA3220 Datasheet(HTML) 13 Page - Texas Instruments

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TPA322x
IN2_M
IN1_P
IN2_P
IN1_P
IN1_M
+
-
+
-
IN1_M
IN2_P
IN2_M
TPA322x
AVDD
GND
VDD
GVDD
100nF
470uF
1µF
1µF
+5V
3R3
5V LDO
TPA322x
GND
GVDD
100nF
470uF
1µF
1µF
3R3
+7V”PVDD
AVDD
GND
VDD
5V LDO
13
TPA3220
www.ti.com
SLASEN3 – JANUARY 2018
Product Folder Links: TPA3220
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Copyright © 2018, Texas Instruments Incorporated
9.3 Feature Description
9.3.1 Internal LDO
TPA3220 has a built in optional LDO (Low dropout voltage regulator) to supply the analog and digital circuits as
well as the gate drive for the output stages. The LDO can be used in systems where only the high voltage power
rail is available, hence no additional power supply rails need to be generated for the TPA3220 to operate. As
being a linear regulator, the LDO will add to the power losses of the device due to the (PVDD-5V) voltage drop
and the supply current for AVDD and GVDD given in the Electrical Characteristics table.
Figure 2. Internal LDO for Single Supply Systems
When using the internal LDO in TPA3220 the VDD terminal should be connected to a voltage source between
7V and PVDD. In a single supply system the VDD terminal should be connected directly to the PVDD terminal.
The LDO output is connected to the AVDD terminal, and can be used to supply the gate drive by supplying the
GVDD from AVDD through a RC filter for best noise performance as shown in Figure 2.
Figure 3. Internal LDO Bypass for Highest Power Efficiency
For highest system power efficiency the LDO can be bypassed by connecting VDD to an external 5 V supply. In
this configuration AVDD and GVDD should be supplied by 5 V from the external power supply. GVDD should be
supplied through a RC filter for best noise performance as shown in Figure 3.
9.3.1.1 Input Configuration, Gain Setting And Master / Slave Operation
TPA3220 is designed to accept either a differential or a single-ended audio input signal. To accept a wide range
of system front ends TPA3220 has selectable input gain that allows full scale output with a wide range of input
signal levels.
Best system noise performance is obtained with balanced audio interface. However, to be used in systems with
only a single ended audio input signal available, one input terminal can be connected to AC ground, to accept
single ended audio input signals.
Figure 4. Balanced Audio Input Configuration


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