LM48580EVM User Guide Datasheet by Texas Instruments

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LM48580 Evaluation Module
User's Guide
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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
List of Tables
1 Operating Conditions........................................................................................................ 3
2 Connections .................................................................................................................. 4
3 LM48580 Bill of Materials................................................................................................... 5
Trademarks
All trademarks are the property of their respective owners.
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Introduction
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LM48580 Evaluation Module
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.
Figure 1. LM48580 Demonstration Board
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–.
‘5‘ TEXAS INSTRUMENTS
4.7µH
L1
GND
TP1
SW
VDD
1µF
C1
VDD
GND
10µF
C2
GND
GND
D1
TP2
VBST
1
2
3
J3
GAIN
VDD
GND
GAIN
SHDN
1
2
3
J1
SHUTDOWN
VDD
GND
IN+
IN-
1µF
C3
GND
100pF
C4
GND
1.00M
R1 J4
OUT
100pF
C6
DNP
100pF
C5
GND
0.47µFC7
0.47µFC8
VAMP C1
SHDN
C2
VBST D1
PGND
D3
SGND
A2
OUT- B1
IN+
A3
VDD
C3
OUT+ A1
IN-
B3
SW D2
GAIN
B2
U1
LM48580TLX/NOPB
J5
IN
J2
VDD
SW
VB
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General Description
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LM48580 Evaluation Module
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 VPP output 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.
Table 1. Operating Conditions
Temperature Range: TMIN TATMAX –40°C TA85°C
Supply Voltage (VDD) 2.5 V VDD 5.5 V
5 Application Circuit Schematic
Figure 2 shows the demonstration board schematic.
Figure 2. Demonstration Board Schematic
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Connections
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LM48580 Evaluation Module
6 Connections
Table 2 lists the connections on the EVM board.
Table 2. Connections
Designator Function Notes
J1 Shutdown Active Low Shutdown. Drive SHDN low to disable the device. Connect SHDN to VDD for
normal operation.
J2 VDD/GND Power supply and ground reference.
J3 GAIN Gain select:
GAIN = float: AV = 18 dB
GAIN = GND: AV = 24 dB
GAIN = VDD: AV = 30 dB
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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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 20 V 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 0Fiducial 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
l TEXAS INSTRUMENTS + INSTRUMENTS W48580EVM AAPOBGA— _ OH OK] OK] 0!] con °oon D0
Demonstration Board PCB Layout
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LM48580 Evaluation Module
9 Demonstration Board PCB Layout
Figure 3. Top Overlay Figure 4. Top Solder Mask
Figure 5. Top Layer Figure 6. Bottom Layer
Figure 7. Bottom Solder Mask Figure 8. Drill Drawing
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Revision History
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Revision History
Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Date Revision Description
February 2018 * Initial Release
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