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TPA6040A4
User Manual
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Texas TPA6040A4 User Manual

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Page 1
TPA6040A4 Audio Power Amplifier Evaluation Module
Contents
1 Introduction .......................................................................................... 1
2 Operation ............................................................................................ 3
3 Schematic and Bill of Materials ................................................................... 5
List of Figures
4 TPA6040A4 EVM – Bottom Side Layout ........................................................ 6
List of Tables
1 Gain Settings ........................................................................................ 4
User's Guide
SLOU196 – April 2007
1 Introduction
1.1 Description
The TPA6040A4 evaluation module 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 TPA6040A4 also contains an LDO capable of outputting 4.75 V with a maximum load of 120 mA.
DirectPath is a trademark of Texas Instruments.
SLOU196 – April 2007 TPA6040A4 Audio Power Amplifier Evaluation Module 1
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J001
Introduction
Figure 1. TI TPA6040A4 Audio Power Amplifier EVM – Top View
1.2 TPA6040A4 EVM 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: 4 Ω , VDD = 5V, THD+N=10% 2 W Headphone output power per channel, PO: 32 Ω , VDD = 5V, THD+N=10% 85 mW
List of Tables2 SLOU196 – April 2007
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2 Operation
2.1 Quick Start List for Stand-Alone Operation
2.1.1 Speaker Amplifier
Follow these steps to use the TPA6040A4 EVM 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 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.
2.1.3 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, 6 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 while installing jumpers DECREASES the gain. Logic levels are TTL-compatible.
Operation
SLOU196 – April 2007 List of Tables 3
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Operation
2.1.4 Power Up
1. Verify correct voltage and input polarity and turn the external power supplies ON.
The EVM should begin operation.
2. Adjust the input signal.
3. Adjust the control inputs to the desired settings.
4. Adjust the amplifier gain by installing/removing the gain jumpers, J5 and J6.
GAIN0 (J5)
(1)
OFF = Jumper REMOVED; ON = Jumper INSTALLED
(1)
ON ON 6
ON OFF 10 OFF ON 15.6 OFF OFF 21.6
Table 1. Gain Settings
GAIN1 (J6)
(1)
Amplifier Gain (dB)
List of Tables4 SLOU196 – April 2007
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3 Schematic and Bill of Materials
S001
3.1 TPA6040A4 EVM Schematic
Schematic and Bill of Materials
SLOU196 – April 2007 List of Tables 5
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Figure 2. TPA6040A4 EVM Schematic
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K001
K002
Schematic and Bill of Materials
3.2 TPA6040A4 EVM PCB Layers
Figure 3. TPA6040A4 EVM – Top Side Layout
Figure 4. TPA6040A4 EVM – Bottom Side Layout
6 List of Tables SLOU196 – April 2007
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3.3 TPA6040A4 EVM Bill of Materials
REF. DESCRIPTION SIZE QTY MFG PART NO. VENDOR NO.
C1–C4 0603 4 TDK C1608X5R1A474K Digi-Key/445-1320-2-ND
C5–C12 0603 8 TDK C1608X5R1A105KT Digi-Key/445-1321-2
C13 0603 1 TDK C1608X7R1H104KT Digi-Key/445-1314-2
C14 0603 1 TDK C1608X5R0J225M Digi-Key/445-1323-1-ND
C15–C17 0805 3 TDK C2012X5R0J106 Digi-Key/445-1363-1-ND
R1–R5 Resistor, chip, 100 k Ω , 1/10W, 5% 0603 5 Panasonic ERJ-3GEYJ104V Digi-Key/P100KG
J1, J2, J11, J12 Phono jack, PC mount, switched 4 Switchcraft PJRAN1X1U03 Newark/16C1860
J3–J7 Header, 2 position, male 2 mm 5 Norcomp 2163-36-01-P2 Digi-Key/2163S-36
J10 Headphone jack 3 Kycon, Inc. STX-3081-5N Mouser/806-STX-3081-5t J15–J18 6 Johnson 111-2223-001 Digi-Key/J587 J19, J20 2 pin 0.1 in. breakaway header 0.1 in. 2 Sullins PBX26SAAN Digi-Key/PBC36SAAN
S1, S2 Switch, momentary, SMD, low profile 2 Panasonic EVQ-PPBA25 Digi-Key/P8086S
U1 1 TI TPA6040A4
32-pin QFN 5-mm sq. and 0,5-mm spacing and exposed thermal pad
Capacitor, ceramic, 0.47- µ F, ± 10%, X5R, 10-V
Capacitor, ceramic, 1- µ F, ± 10%, X5R, 10-V
Capacitor, ceramic, 0.1- µ F, ± 10%, X7R, 50-V
Capacitor, ceramic, 2.2- µ F, 6.3 V, X5R, 20%
Capacitor, ceramic, 10- µ F, 6.3 V, Y5R, 20%
Banana jack w/knurled thumbnut (nickel plate)
TPA6040A4 2-W stereo audio power RTV amplifer (S-PQFP-N32)
Schematic and Bill of Materials
SLOU196 – April 2007 List of Tables 7
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