Texas Instruments LM48580 User Manual

User's Guide

SNAU231–February 2018

LM48580 Evaluation Module

This user's guide describes the characteristics, operation, and use of the LM48580 Evaluation Module (EVM). A complete schematic diagram, printed-circuit board layouts, and bill of materials (BOM) are included in this document.

Contents

1 Introduction ................................................................................................................... 2

2 Quick Start Guide............................................................................................................ 2

3 General Description ......................................................................................................... 3

4 Operating Conditions........................................................................................................ 3

5 Application Circuit Schematic .............................................................................................. 3

6 Connections .................................................................................................................. 4

7 PCB Layout Guidelines ..................................................................................................... 4

8 Bill Of Materials .............................................................................................................. 5

9 Demonstration Board PCB Layout ........................................................................................ 6

List of Figures

1 LM48580 Demonstration Board............................................................................................ 2

2 Demonstration Board Schematic .......................................................................................... 3

3 Top Overlay .................................................................................................................. 6

4 Top Solder Mask............................................................................................................. 6

5 Top Layer ..................................................................................................................... 6

6 Bottom Layer ................................................................................................................. 6

7 Bottom Solder Mask......................................................................................................... 6

8 Drill Drawing.................................................................................................................. 6

1 Operating Conditions........................................................................................................ 3

2 Connections .................................................................................................................. 4

3 LM48580 Bill of Materials................................................................................................... 5

Trademarks

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List of Tables

LM48580 Evaluation Module

Introduction

1 Introduction

To help the user investigate and evaluate the LM48580 performance and capabilities, a fully-populated demonstration board was created. Figure 1 shows the board.

Connected to an external power supply (2.5 V ≤ VDD≤ 5.5 V) and a signal source, the LM48580 demonstration board easily exercises features of the amplifier.

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2 Quick Start Guide

Use the following steps to set up the EVM board in hardware mode:

1. Short pins 1 (VDD) and 2 of J1 for normal operation.

2. Short pins 1 (VDD) and 2 on J3 to set the GAIN to 30 dB.

3. Connect the load across OUT+ and OUT–.

4. Connect a power supply (2.5 V to 5.5 V) and ground reference, respectively, to the VDD and GND headers on the demo board.

5. Connect a differential audio input to IN+ and IN–.

6. Power on the board and observe the output on OUT+ and OUT–.

LM48580 Evaluation Module

Figure 1. LM48580 Demonstration Board

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4.7µH

GND

TP1

VDD

1µF

VDD

GND

10µF

GND

TP2

VBST

1 2 3

GAIN

VDD

GND

GAIN

SHDN

1 2 3

SHUTDOWN

VDD

GND

IN+

IN-

1µF

GND

100pF

GND

1.00M

OUT

100pF

DNP

100pF

GND

0.47µFC7

0.47µFC8

VAMP

SHDN

VBST

PGND

SGND

OUT-

IN+

VDD

OUT+

IN-

GAIN

LM48580TLX/NOPB

VDD

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3 General Description

The LM48580 is a high-voltage, high-efficiency, Class H driver for ceramic speakers and piezo actuators. The Class H architecture of the LM48580 offers significant power savings compared to traditional Class AB amplifiers. The device provides 30 VPPoutput drive while consuming only 2.7 mA of quiescent current from a 3.6-V supply.

The LM48580 features one fully-differential input, a programmable gain pin, and a shutdown pin. The gain pin has three settings for 18 dB, 24 dB, and 30 dB. The LM48580 has a low power shutdown mode that reduces quiescent current consumption to 0.5 μA.

4 Operating Conditions

Table 1 lists the temperature range and supply voltage conditions for the EVM.

General Description

Table 1. Operating Conditions

Temperature Range: T

MIN

Supply Voltage (VDD) 2.5 V ≤ VDD≤ 5.5 V

5 Application Circuit Schematic

Figure 2 shows the demonstration board schematic.

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≤ TA≤ T

MAX

Figure 2. Demonstration Board Schematic

–40°C ≤ TA≤ 85°C

LM48580 Evaluation Module

Connections

6 Connections

Table 2 lists the connections on the EVM board.

Designator Function Notes

J1 Shutdown Active Low Shutdown. Drive SHDN low to disable the device. Connect SHDN to VDD for

J2 VDD/GND Power supply and ground reference. J3 GAIN Gain select:

J4 OUT± Positive and negative output terminals. J5 IN± Positive and negative input terminals.

7 PCB Layout Guidelines

Minimize trace impedance of the power, ground and all output traces for optimum performance. Voltage loss due to trace resistance between the LM48580 and the load results in decreased output power and efficiency. Trace resistance between the power supply and ground has the same effect as a poorly regulated supply: increased ripple and reduced peak output power. Use wide traces for power supply inputs and amplifier outputs to minimize losses due to trace resistance, as well as route heat away from the device. Proper grounding improves audio performance, minimizes crosstalk between channels and prevents switching noise from interfering with the audio signal. Use of power and ground planes is recommended.

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Table 2. Connections

normal operation.

GAIN = float: AV = 18 dB GAIN = GND: AV = 24 dB GAIN = VDD: AV = 30 dB

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Bill Of Materials

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LM48580 Evaluation Module

8 Bill Of Materials

Table 3 lists the bill of materials for the EVM.

Table 3. LM48580 Bill of Materials

Designator Quantity Value Description

Package

Reference

Part Number Manufacturer

Alternate Part

Number

Alternate

Manufacturer

PCB 1 Printed Circuit Board AAP086 Any – – C1, C3 2 1 µF

Capacitor, ceramic, 1 µF, 16 V, ±10%, X7R, 0603

0603 GRM188R71C105KE15D MuRata

C2 1 10 µF

Capacitor, TA, 10 µF, 16 V, ±10%, 0.8 Ω, SMD

3528-21 TPSB106K016R0800 AVX

C4, C5 2 100 pF

Capacitor, ceramic, 100 pF, 50 V, ±5%, C0G/NP0, 0603

0603 GRM1885C1H101JA01D MuRata

C7, C8 2 0.47 µF

Capacitor, ceramic, 0.47 µF, 10 V, ±10%, X5R, 0603

0603 GRM188R61A474KA61D MuRata

D1 1 20V

Diode, Schottky, 20 V, 0.5 A, AEC-Q101, SOD-523

SOD-523 NSR0520V2T1G

ON Semiconductor

H1, H2, H3, H4 4 Bumpon, Hemisphere, 0.44 × 0.20, Clear

Transparent Bumpon

SJ-5303 (CLEAR) 3M

J1, J3 2 Header, 100 mil, 3 × 1, Gold, TH PBC03SAAN PBC03SAAN

Sullins Connector Solutions

J2, J4, J5 3 Terminal Block, 2 × 1, 2.54 mm, TH

Terminal Block, 2 × 1,

2.54 mm, TH

282834-2 TE Connectivity

L1 1 4.7 µH

Inductor, Wirewound, 4.7 µH, 1 A,

0.216 Ω, SMD

1210 BRL3225T4R7M Taiyo Yuden

SH1, SH2 2 1 × 2 Shunt, 100 mil, Gold plated, Black Shunt 969102-0000-DA 3M SNT-100-BK-G Samtec

U1 1

High Efficiency Class H, High Voltage, Haptic Piezo Actuator / Ceramic Speaker Driver, 12-pin Micro SMD, Pb-Free

TLA12Z1A LM48580TLX/NOPB

Texas Instruments

C6 0 100 pF

Capacitor, ceramic, 100 pF, 50 V, ±5%, C0G/NP0, 0603

0603 GRM1885C1H101JA01D MuRata

FID1, FID2, FID3

Fiducial mark. There is nothing to buy or mount.

Fiducial N/A N/A

R1 0 1.00 Meg RES, 1.00 M, 1%, 0.1 W, 0603 0603 RC0603FR-071ML Yageo America

Demonstration Board PCB Layout

9 Demonstration Board PCB Layout

Figure 3. Top Overlay Figure 4. Top Solder Mask

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Figure 5. Top Layer Figure 6. Bottom Layer

Figure 7. Bottom Solder Mask Figure 8. Drill Drawing

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Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Date Revision Description

February 2018 * Initial Release

Revision History

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Revision History

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