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
0.47µF
C7
0.47µF
C8
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
www.ti.com
General Description
3
SNAU231 – February 2018
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
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 V
PP
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
μ
A.
4
Operating Conditions
Table 1
lists the temperature range and supply voltage conditions for the EVM.
Table 1. Operating Conditions
Temperature Range: T
MIN
≤
T
A
≤
T
MAX
–40°C
≤
T
A
≤
85°C
Supply Voltage (V
DD
)
2.5 V
≤
V
DD
≤
5.5 V
5
Application Circuit Schematic
Figure 2
shows the demonstration board schematic.
Figure 2. Demonstration Board Schematic
