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
Copyright © 2018, Texas Instruments Incorporated
LM48580 Evaluation Module
1
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–.
2
LM48580 Evaluation Module
Figure 1. LM48580 Demonstration Board
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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
Copyright © 2017, Texas Instruments Incorporated
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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
Copyright © 2018, Texas Instruments Incorporated
–40°C ≤ TA≤ 85°C
LM48580 Evaluation Module
3
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