This user's guide describes the characteristics, operation, and use of the TPA3220 Evaluation Module
Micro. A complete printed-circuit board (PCB) description, schematic diagram, and bill of materials (BOM)
are also included.
The following section describes the necessary hardware, connections, configuration, and steps to quick
start the EVM into BTL mode with stereo audio playing out of two speakers.
Figure 1 illustrates the BTL mode output configuration
Quick Start (BTL MODE)
1.1Required Hardware
The following hardware is required for this EVM:
•TPA3220EVM-Micro
•Power supply 5–14 A, 12–30 VDC
•Two 2–8 Ω speaker or resistor loads (ensure speaker or load is appropriately sized for required
wattage output)
Use the following steps when connecting and configuring the board in BTL MODE:
1. Ensure the power supply is OFF. Connect the power supply positive terminal to J6 PVDD and negative
terminal to J6 GND.
2. Connect the left channel speaker, power resistor load (3–8 Ω) to the TPA3220EVM-Micro positive
output terminal (J4 OUT1+) and other side of the speaker, power resistor to the TPA3220EVM-Micro
negative output terminal (J4 OUT1–).
3. Connect the right channel speaker, power resistor load (3–8 Ω) to the TPA3220EVM-Micro positive
output terminal (J5 OUT2+) and other side of the speaker, power resistor to the TPA3220EVM-Micro
negative output terminal (J5 OUT2–).
4. Check to make sure that the power supply is only connected to J6 and speakers are connected to J4
or J5 only, as their colors are the same.
5. Input Configuration:
a. Differential Inputs: Depopulate R3 and R13
b. Single-Ended Inputs: Populate R3 and R13
c. Audio Interface Board Input: Populate R1, R2, R11, and R12
6. Ensure that RESET S1 is in the lower position of RESET.
7. Check Table 1 for all necessary jumper and switch configurations.
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Table 1. Jumper and Switch Configurations (BTL Mode)
ComponentComponent DescriptionConfiguration for BTL
R28, R31Gain/SLV SelectMSTR-34dB
R3, R13Input DIFF or SE SelectSE = Populate
DIFF = Remove
R1, R2, R11,
R12
R27, R29HEAD or AD Mode SelectHEAD = Populate R27, Remove R29
Ensure that required connections and configurations have been checked. The TPA3220EVM-Micro board
can now be powered on.
1. Enable the power supply at 12 V to 30 V and ensure that LED D2 illuminates. LEDs D1 and D3 should
not be illuminated.
2. Switch S1 out of RESET. The FAULT LED (D1) should blink once quickly, then remain unilluminated.
3. Note that the EVM does not have volume control, configure your analog input for a reasonable audio
level before beginning audio playback.
4. Enable audio input playback and the EVM should begin driving audio out of the left and right speakers.
If resistor loads are used for testing instead of speakers, they will now be energized.
2Setup By Mode
The following sections describe the setup and configuration for each output mode. The TPA3220DDV
EVM-Micro allows for two output modes: Stereo BTL and Mono PBTL.
2.1BTL MODE (Stereo - 2 Speaker Outputs)
This mode is the same as described in Quick Start (BTL MODE) .
2.2PBTL MODE (Mono – 1 Speaker Output)
This mode provides one speaker output that is more powerful than each BTL output and is useful when
mono audio is to be played or when more power is needed.
Figure 4 illustrates the PBTL mode output configuration with 4 inductors.
Quick Start (BTL MODE)
Figure 4. Output Configuration PBTL - 4 Inductors
2.2.1Connections and Board Configuration
Use the following steps when connecting and configuring the board in BTL MODE:
1. Ensure the power supply is OFF. Connect the positive terminal of the power supply to J6 PVDD and
negative terminal to J6 GND.
2. Connect one channel speaker, power resistor load (2–8 Ω) to the TPA3220EVM-Micro positive output
terminal (J4 OUT1+) and other side of the speaker, power resistor to the TPA3220EVM-Micro negative
output terminal (J4 OUT1–).
3. Use a wire to connect J5 OUT2+ to J4 OUT1+, then use another wire to connect J5 OUT2– to J4
OUT1–. This forms a parallel connection of both OUTx+ to one side of the speaker and a parallel
connection of both OUTx– to the other side of the speaker.
4. Check to make sure that the power supply is connected to J6 only and speakers are connected to J4
or J5 only, as their colors are the same.
5. Input Configuration:
a. Differential Inputs: Depopulate R3 and R13
b. Single-Ended Inputs: Populate R3 and R13
c. Audio Interface Board Input: Populate R1, R2, R11, and R12
6. Ensure that RESET S1 is in the lower position of RESET.
7. Check Table 2 for all jumper and switch configurations necessary.
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Table 2. Jumper and Switch Configurations (PBTL Mode)
ComponentComponent DescriptionConfiguration for PBTL
R28, R31Gain/SLV SelectMSTR-34dB
R3, R13Input DIFF or SE SelectSE = Populate
DIFF = Remove
R1, R2, R11, R12AIB Input SelectPopulated
R27, R29HEAD or AD Mode SelectHEAD = Populate R27, Remove R29
AD = Remove R27, Populate R29
R22, R26PBTL or BTL SelectPopulate
S1RESET ControlRESET
R25FREQ_ADJMASTER MODE = 480 kHz
2.2.2Power-Up
Ensure that required connections and configurations have been checked. The TPA3220EVM-Micro board
can now be powered on.
1. Enable the power supply at 12 V to 30 V and ensure that LED D2 illuminates. LEDs D1 and D3 should
not be illuminated.
2. Switch S1 out of RESET. The FAULT LED (D1) should blink once quickly, then remain unilluminated.
3. Note that the EVM does not have volume control, configure your analog input for a reasonable audio
level before beginning audio playback.
4. Enable audio input playback and the EVM should begin driving audio out of the left and right speakers.
If resistor loads are used for testing instead of speakers, they will now be energized.
The TPA3220EVM-Micro is equipped with LED indicators that illuminate when the FAULT or CLIP_OTW
pin goes low. See Table 3 and TPA3220 100-W Peak HD-Audio, Analog-Input, Class-D for more details.
Table 3. Fault and Clip Overtemperature Status
FAULT LED
Status
ONONOvertemperature (OTE) or overload (OLP) or undervoltage (UVP). Junction
ONOFFOverload (OLP) or undervoltage (UVP). Junction temperature lower than 125°C
OFFONJunction temperature higher than 125°C (OTE warning)
OFFOFFJunction temperature lower than 125°C and no OLP or UVP faults (normal
CLIP_OTW LED StatusDescription
temperature higher than 125°C (OTE warning)
operation)
3.2PWM Frequency Adjust
The TPA3220EVM-Micro allows for three oscillator frequency options by external configuration of the
FREQ_ADJ pin. The frequency adjust can be used to reduce interference problems while using a radio
receiver tuned within the AM band. These values should be chosen such that the nominal and the lower
value switching frequencies together results in the fewest cases of interference throughout the AM band.
The oscillator frequency can be selected by the value of the FREQ_ADJ resistor connected to GND in
master mode according to Table 4.
Selecting Slave Mode configures the OSC_I/O pins as inputs to be slaved from an external differential
clock. In a master or slave system, interchannel delay is automatically set up between the switching
phases of the audio channels, which can be illustrated by no idle channels switching at the same time.
This will not influence the audio output, but only the switch timing to minimize noise coupling between
audio channels through the power supply. This will optimize audio performance and result in better
operating conditions for the power supply. The inter-channel delay will be set up for a slave device
depending on the polarity of the OSC_I/O connection such that slave mode 1 is selected by connecting
the OSC_I/O of the master device with the OSC_I/O of the slave device with the same polarity (+ to +
and – to –), while slave mode 2 is selected by connecting the OSC_I/Os with the inverse polarity (+ to –
and – to +).
3.3Modulation Modes (AD Mode and HEAD Mode)
The TPA3220EVM-Micro supports both AD modulation as well as HEAD modulation. In AD mode, each of
the two half-bridge outputs are continuously switching. AD mode is the default mode for the
TPA3220EVM-Micro. The EVM also supports HEAD mode modulation. HEAD mode also switches both
half-bridge outputs but also optimizes the switching for lower power loss at idle as well as increased EMI
performance at cost of some performance. The device accomplishes this by reducing its duty cycle at idle
and while playing small signals. At higher output levels HEAD mode will also reduce the switching on one
of the half bridges. The modulation mode can be controlled through jumper J6 on the EVM as follows:
More information on the differences between HEAD mode and AD mode as well as performance data is
found in TPA3220 100-W Peak HD-Audio, Analog-Input, Class-D .
3.4Output Mode Selection
The TPA3220 does not use discrete mode pins and therefore relies solely on the states of the IN2_M and
IN2_P pins. Connecting the IN2_M and IN2_P pins to regular high output impedance audio outputs by
removing J7 and J8 puts the TPA3220 into BTL mode (2 × stereo outputs). Tying the IN2_M and IN2_P
pins to GND by populating R22 and R26 puts the TPA3220 into PBTL mode (1 × mono output). This is
summarized in Table 6:
Table 6. Output Mode and Modulation Mode Selection
The TPA3220EVM-Micro includes a few options for power configuration so that various input types can be
evaluated.
3.5.1TPA3220 Supplies
The TPA3220 device has a few power supplies which each have their own voltage range and rules.
Details for each supply are as shown:
•PVDD – This is the main device supply which accepts from 7 V to 30 V. Power output of the device is
derived solely from PVDD and therefore it is important to configure this supply according to the chosen
output configuration and load. Complete details are included in TPA3220 100-W Peak HD-Audio,
Analog-Input, Class-D .
•VDD – This supply is used for the non-PVDD power of the device for blocks such as the front-end and
control circuitry. The TPA3220 internal 5-V LDO is also powered by this pin. VDD can be powered by 5
V directly if using the TPA3220 with the internal regulator OFF. In this case, tie the GVDD and AVDD
pins directly to VDD through R18 and remove R16. When the internal regulator is used, VDD must be
between 7 V and PVDD through R16. GVDD and AVDD are only 5-V tolerant, so R18 must be
removed.
•GVDD and AVDD – These pins are used for the gate drive and analog supply of the device. These
pins accept only 5 V. When the internal regulator is used, these pins are fed internal to the device, no
external connection is necessary. When the internal regulator is OFF.