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Texas Instruments TPA6041A4EVM - User guides
User's Guide
SLOU203 – August 2007
TPA6041A4 Audio Power Amplifier Evaluation Module
1
2
3
Contents
Introduction ................................................................................................................... 1
Operation ..................................................................................................................... 3
Schematic and Bill of Materials ............................................................................................ 5
List of Figures
1
2
3
4
TI TPA6041A4 Audio Power Amplifier EVM – Top View ...............................................................
EVM Schematic ..............................................................................................................
Top Side Layout..............................................................................................................
Bottom Side Layout ..........................................................................................................
2
5
6
6
List of Tables
1
Gain Settings ................................................................................................................. 4
1
Introduction
1.1
Description
The TPA6041A4 evaluation module (EVM) consists of a single 2-W stereo speaker amplifier and 85-mW
DirectPath™ headphone amplifier complete with a small number of external components mounted on a
circuit board that can be used to drive speakers and headphones directly with external analog audio
sources as inputs. The TPA6041A4 also contains an LDO capable of outputting 3.3 V with a maximum
load of 120 mA.
DirectPath is a trademark of Texas Instruments.
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TPA6041A4 Audio Power Amplifier Evaluation Module
1
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Introduction
Figure 1. TI TPA6041A4 Audio Power Amplifier EVM – Top View
1.2
TPA6041A4EVM Specifications
Supply voltage range, VDD
4.5 V to 5.5 V
Supply current, IDD
1 A, maximum
Speaker amplifier output power per channel, PO: 4Ω, VDD = 5 V, THD+N=1%
Headphone output power per channel, PO: 32 Ω, VDD = 5 V, THD+N=10%
2
List of Tables
2W
85 mW
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Operation
2
Operation
2.1
Quick-Start List for Stand-Alone Operation
2.1.1
Speaker Amplifier
Follow these steps to use the TPA6041A4EVM stand-alone or when connecting it into existing circuits or
equipment. Connections to the EVM can be made by inserting stripped wire or using banana plugs for the
power supply and output connections. The inputs accept standard RCA plugs.
2.1.2
2.1.3
Power Supply
1. Ensure that all external power sources are set to OFF.
2. Connect an external regulated power supply adjusted to 5 V to the module VDD (J13) and GND (J14)
banana jacks, taking care to observe marked polarity.
Evaluation Module Preparations
Inputs and Outputs
1. If connecting to a fully differential input or a grounded input (the shield of the RCA is GND), remove
jumpers J3 and J4 from the EVM. If connecting to a floating source like a portable CD, install jumpers
J3 and J4. After setting the J3 and J4 jumpers appropriately, connect the input source to either the
speaker inputs (J1 and J2) or the headphone inputs (J11 and J12) or both.
2. Connect a speaker across +LOUT (J15) and –LOUT (J16). Connect another speaker across +ROUT
(J17) and –ROUT (J18).
3. Install both gain jumpers GAIN0 (J5) and GAIN1 (J6). This sets the gain of the amplifier to the lowest
level, 10 dB.
4. Connect a set of headphones to the headphone output jack (J10).
Control Inputs
1. Speaker Enable: This terminal is active-low. A LOW on the device terminal (<0.8 V) enables the
amplifier; a HIGH (>2 V) on the device terminal places the amplifier in the SHUTDOWN state. Holding
down switch S1 places the amplifier in the SHUTDOWN state. Releasing S1 returns the amplifier to
the active state.
2. Headphone Enable: This terminal is active-high. A LOW on the device terminal (<0.8 V) shuts down
the headphone amplifier; a HIGH (>2 V) on the device terminal places the headphone amplifier in the
active state. Holding down switch S2 places the headphone amplifier in the SHUTDOWN state.
Releasing S2 returns the headphone amplifier to the active state.
3. GAIN0/GAIN1: Together, these terminals determine the gain of the amplifier. See Table 1. Installing a
jumper in J5 or J6 sets the respective terminal to GND. Removing the jumper sets the respective
terminals to VDD. Removing jumpers increases the gain, whereas installing jumpers decreases the
gain. Logic levels are TTL compatible.
4. Regulator Enable: Shunt J7 and remove jumper for J19 to enable the regulator output. Remove
jumper for J7 and shunt J19 to disable the regulator output. Never shunt J19 if J7 is shunt.
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List of Tables
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Operation
Table 1. Gain Settings
GAIN0 (J5) (1)
(1)
2.1.4
1.
2.
3.
4.
4
GAIN1 (J6) (1)
Amplifier Gain (dB)
ON
ON
10
ON
OFF
12
OFF
ON
15.6
OFF
OFF
21.6
OFF = Jumper REMOVED; ON = Jumper INSTALLED
Power Up
Verify correct voltage and input polarity, and turn on the external power supplies.
The EVM should begin operation.
Adjust the input signal.
Adjust the control inputs to the desired settings.
Adjust the amplifier gain by installing/removing the gain jumpers, J5 and J6.
List of Tables
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Schematic and Bill of Materials
3
Schematic and Bill of Materials
3.1
TPA6041A4EVM Schematic
Figure 2. EVM Schematic
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Schematic and Bill of Materials
3.2
TPA6041A4EVM PCB Layers
Figure 3. Top Side Layout
K002
Figure 4. Bottom Side Layout
6
List of Tables
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Schematic and Bill of Materials
3.3
TPA6041A4EVM Bill of Materials
REF.
DESCRIPTION
C1–C4
Capacitor, ceramic, 0.47-μF, ±10%, X5R,
10-V
PART NO.
VENDOR NO.
0603
4
TDK
C1608X5R1A474K
Digi-Key/445-1320-2-ND
C5–C12
Capacitor, ceramic, 1-μF, ±10%, X5R,
10-V
0603
8
TDK
C1608X5R1A105KT
Digi-Key/445-1321-2
C13
Capacitor, ceramic, 0.1-μF, ±10%, X7R,
50-V
0603
1
TDK
C1608X7R1H104KT Digi-Key/445-1314-2
C14
Capacitor, ceramic, 2.2-μF, 6.3 V, X5R,
20%
0603
1
TDK
C1608X5R0J225M
Digi-Key/445-1323-1-ND
C15–C17
Capacitor, ceramic, 10-μF, 6.3 V, Y5R,
20%
0805
3
TDK
C2012X5R0J106
Digi-Key/445-1363-1-ND
Resistor, chip, 100 kΩ, 1/10W, 5%
0603
5
Panasonic
ERJ-3GEYJ104V
Digi-Key/P100KG
4
Switchcraft
PJRAN1X1U03
Newark/16C1860
5
Norcomp
2163-36-01-P2
Digi-Key/2163S-36
Headphone jack
3
Kycon, Inc.
STX-3081-5N
Mouser/806-STX-3081-5t
J15–J18
Banana jack w/knurled thumbnut (nickel
plate)
6
Johnson
111-2223-001
Digi-Key/J587
J19, J20
2 pin 0.1 in. breakaway header
2
Sullins
PBX26SAAN
Digi-Key/PBC36SAAN
2
Panasonic
EVQ-PPBA25
Digi-Key/P8086S
1
TI
TPA6041A4
R1–R5
J1, J2, J11, J12
J3–J7
J10
SIZE
Phono jack, PC mount, switched
Header, 2 position, male
S1, S2
Switch, momentary, SMD, low profile
U1
TPA6041A4 2-W stereo audio power
amplifier
2 mm
0.1 in.
RTV
(S-PQFP-N32)
QTY
MFG
32-pin QFN 5-mm sq. and 0,5-mm spacing and exposed thermal pad
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List of Tables
7
EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have
electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental
measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does
not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling
(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
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Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This
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FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio
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designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 4.5 V to 5.5 V and the output voltage range of 0 V to 5.5 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions
concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 85°C. The EVM is designed to operate
properly with certain components above 85°C as long as the input and output ranges are maintained. These components include but are
not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
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Copyright © 2007, Texas Instruments Incorporated
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