General Description; Operating Conditions; Application Circuit Schematic - Texas Instruments LM48580 User Manual

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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
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.
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Operating Conditions

Table 1 lists the temperature range and supply voltage conditions for the EVM.
Temperature Range: T
Supply Voltage (V
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Application Circuit Schematic

Figure 2 shows the demonstration board schematic.
VDD
J2
VDD
GND
VDD
J1
1
2
3
SHUTDOWN
GND
VDD
J3
1
2
3
C5
GAIN 100pF
GND
GND
J5
C7
C8
IN
SNAU231 – February 2018
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output drive while consuming only 2.7 mA of quiescent current
PP
Table 1. Operating Conditions
≤ T ≤ T
MIN A MAX
)
DD
VDD
C1
C2
1µF
10µF
GND GND
SHDN
GAIN
IN+
IN-
0.47µF
0.47µF
Figure 2. Demonstration Board Schematic
Copyright © 2018, Texas Instruments Incorporated
–40°C ≤ T
2.5 V ≤ V
L1
4.7µH
U1
C3 D2
VDD SW
D3
PGND
A2 D1
SGND VBST
C2
SHDN
B2 C1
GAIN VAMP
A3 A1
IN+ OUT+
B3 B1
IN- OUT-
LM48580TLX/NOPB
GND
Copyright © 2017, Texas Instruments Incorporated
General Description
≤ 85°C
A
≤ 5.5 V
DD
SW VBST
TP1
SW D1
VB
C3 C4
1µF 100pF
GND GND
R1
1.00M
C6
100pF
DNP
LM48580 Evaluation Module
TP2
J4
OUT
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