Texas Tpa6040a4 User manual

1 Introduction

1.1 Description

User's GuideSLOU196 – April 2007

TPA6040A4 Audio Power Amplifier Evaluation Module

Contents1 Introduction .......................................................................................... 12 Operation ............................................................................................ 33 Schematic and Bill of Materials ................................................................... 5

List of Figures

1 TI TPA6040A4 Audio Power Amplifier EVM – Top View ...................................... 22 TPA6040A4 EVM Schematic ..................................................................... 53 TPA6040A4 EVM – Top Side Layout ............................................................ 64 TPA6040A4 EVM – Bottom Side Layout ........................................................ 6

List of Tables

1 Gain Settings ........................................................................................ 4

The TPA6040A4 evaluation module consists of a single 2-W stereo speaker amplifier and 85-mWDirectPath™ headphone amplifier complete with a small number of external components mounted on acircuit board that can be used to drive speakers and headphones directly with external analog audiosources as inputs. The TPA6040A4 also contains an LDO capable of outputting 4.75 V with a maximumload of 120 mA.

DirectPath is a trademark of Texas Instruments.

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J001

1.2 TPA6040A4 EVM Specifications

Introduction

Figure 1. TI TPA6040A4 Audio Power Amplifier EVM – Top View

Supply voltage range, VDD 4.5 V to 5.5 VSupply current, IDD 1 A, maximumSpeaker amplifier output power per channel, P

: 4 Ω, VDD = 5V, THD+N=10% 2 WHeadphone output power per channel, P

: 32 Ω, VDD = 5V, THD+N=10% 85 mW

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2 Operation

2.1 Quick Start List for Stand-Alone Operation

2.1.1 Speaker Amplifier

2.1.2 Power Supply

2.1.3 Evaluation Module Preparations

Operation

Follow these steps to use the TPA6040A4 EVM stand-alone or when connecting it into existing circuits orequipment. Connections to the EVM can be made by inserting stripped wire or using banana plugs for thepower supply and output connections. The inputs accept standard RCA plugs.

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.

Inputs and Outputs1. If connecting to a fully differential input or a grounded input (the shield of the RCA is GND), removejumpers J3 and J4 from the EVM. If connecting to a floating source like a portable CD, install jumpersJ3 and J4. After setting the J3 and J4 jumpers appropriately, connect the input source to either thespeaker 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 lowestlevel, 6 dB.4. Connect a set of headphones to the headphone output jack ( J10).

Control Inputs1. Speaker Enable: This terminal is active-low. A LOW on the device terminal (<0.8 V) enables theamplifier; a HIGH (>2 V) on the device terminal places the amplifier in the SHUTDOWN state. Holdingdown switch S1 places the amplifier in the SHUTDOWN state. Releasing S1 returns the amplifier tothe active state.2. Headphone Enable: This terminal is active-high. A LOW on the device terminal (<0.8 V) shuts downthe headphone amplifier; a HIGH (>2 V) on the device terminal places the headphone amplifier in theactive 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 ajumper in J5 or J6 sets the respective terminal to GND. Removing the jumper sets the respectiveterminals to VDD. Removing jumpers INCREASES the gain while installing jumpers DECREASES thegain. Logic levels are TTL-compatible.

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2.1.4 Power Up

Operation

Table 1. Gain Settings

GAIN0 (J5)

(1)

GAIN1 (J6)

(1)

Amplifier Gain (dB)

ON ON 6ON OFF 10OFF ON 15.6OFF OFF 21.6

(1)

OFF = Jumper REMOVED; ON = Jumper INSTALLED

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.

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3 Schematic and Bill of Materials

3.1 TPA6040A4 EVM Schematic

S001

Schematic and Bill of Materials

Figure 2. TPA6040A4 EVM Schematic

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3.2 TPA6040A4 EVM PCB Layers

K001

K002

Schematic and Bill of Materials

Figure 3. TPA6040A4 EVM – Top Side Layout

Figure 4. TPA6040A4 EVM – Bottom Side Layout

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3.3 TPA6040A4 EVM Bill of Materials

Schematic and Bill of Materials

REF. DESCRIPTION SIZE QTY MFG PART NO. VENDOR NO.

Capacitor, ceramic, 0.47- µF, ±10%, X5R,C1–C4 0603 4 TDK C1608X5R1A474K Digi-Key/445-1320-2-ND10-V

Capacitor, ceramic, 1- µF, ±10%, X5R,C5–C12 0603 8 TDK C1608X5R1A105KT Digi-Key/445-1321-210-V

Capacitor, ceramic, 0.1- µF, ±10%, X7R,C13 0603 1 TDK C1608X7R1H104KT Digi-Key/445-1314-250-V

Capacitor, ceramic, 2.2- µF, 6.3 V, X5R,C14 0603 1 TDK C1608X5R0J225M Digi-Key/445-1323-1-ND20%

Capacitor, ceramic, 10- µF, 6.3 V, Y5R,C15–C17 0805 3 TDK C2012X5R0J106 Digi-Key/445-1363-1-ND20%

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

Banana jack w/knurled thumbnut (nickelJ15–J18 6 Johnson 111-2223-001 Digi-Key/J587plate)

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

TPA6040A4 2-W stereo audio power RTVU1 1 TI TPA6040A4amplifer (S-PQFP-N32)

32-pin QFN 5-mm sq. and 0,5-mm spacing and exposed thermal pad

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