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TPA0232
STEREO 2-W AUDIO POWER AMPLIFIER
WITH DC VOLUME CONTROL AND MUX CONTROL
SLOS286 – NOVEMBER 1999
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Compatible With PC 99 Desktop Line-Out
Into 10-kΩ Load
D
Compatible With PC 99 Portable Into 8-Ω
Load
D
Internal Gain Control, Which Eliminates
External Gain-Setting Resistors
D
DC Volume Control From +20 dB to –40 dB
D
2-W/Ch Output Power Into 3-Ω Load
D
Input MUX Select Terminal
D
PC-Beep Input
D
Depop Circuitry
D
Stereo Input MUX
D
Fully Differential Input
D
Low Supply Current and Shutdown Current
D
Surface-Mount Power Packaging
24-Pin TSSOP PowerPAD
description
The TPA0232 is a stereo audio power amplifier in a 24-pin TSSOP thermally enhanced package capable of
delivering 2 W of continuous RMS power per channel into 3-Ω loads. This device minimizes the number of
external components needed, which simplifies the design and frees up board space for other features. When
driving 1 W into 8-Ω speakers, the TPA0232 has less than 0.4% THD+N across its specified frequency range.
Included within this device is integrated depop circuitry that virtually eliminates transients that cause noise in
the speakers.
Amplifier gain is controlled by means of a dc voltage input on the VOLUME terminal. There are 31 discrete steps
covering the range of +20 dB (maximum volume setting) to –40 dB (minimum volume setting) in 2 dB steps.
When the VOLUME terminal exceeds 3.54 V, the device is muted. An internal input MUX allows two sets of
stereo inputs to the amplifier. The HP/LINE
terminal allows the user to select which MUX input is active
regardless of whether the amplifier is in SE or BTL mode. In notebook applications, where internal speakers
are driven as BTL and the line outputs (often headphone drive) are required to be SE, the TPA0232
automatically switches into SE mode when the SE/BTL
input is activated, and this effectively reduces the gain
by 6 dB.
The TPA0232 consumes only 10 mA of supply current during normal operation. A miserly shutdown mode
reduces the supply current to less than 150 µA.
The PowerPAD package (PWP) delivers a level of thermal performance that was previously achievable only
in TO-220-type packages. Thermal impedances of approximately 35°C/W are readily realized in multilayer PCB
applications. This allows the TPA0232 to operate at full power into 8-Ω loads at ambient temperatures of 85°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
PWP PACKAGE
(TOP VIEW)
GND
HP/LINE
VOLUME
LOUT+
LLINEIN
LHPIN
PV
DD
RIN
LOUT–
LIN
BYPASS
GND
GND
RLINEIN
SHUTDOWN
ROUT+
RHPIN
V
DD
PV
DD
CLK
ROUT–
SE/BTL
PC-BEEP
GND
PowerPAD is a trademark of Texas Instruments Incorporated.
TPA0232
STEREO 2-W AUDIO POWER AMPLIFIER
WITH DC VOLUME CONTROL AND MUX CONTROL
SLOS286 – NOVEMBER 1999
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
functional block diagram
ROUT+
–
+
–
+
R
MUX
32-Step
Volume
Control
PC
Beep
MUX
Control
Depop
Circuitry
Power
Management
–
+
–
+
L
MUX
32-Step
Volume
Control
RHPIN
RLINEIN
VOLUME
RIN
PC-BEEP
SE/BTL
LHPIN
LLINEIN
LIN
ROUT–
PV
DD
V
DD
BYPASS
SHUTDOWN
GND
LOUT+
LOUT–
HP/LINE
TPA0232
STEREO 2-W AUDIO POWER AMPLIFIER
WITH DC VOLUME CONTROL AND MUX CONTROL
SLOS286 – NOVEMBER 1999
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
AVAILABLE OPTIONS
PACKAGED DEVICE
T
A
TSSOP
†
(PWP)
–40°C to 85°C TPA0232PWP
†
The PWP package is available taped and reeled. To order a taped and reeled part,
add the suffix R to the part number (e.g., TPA0232PWPR).
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME NO.
I/O
DESCRIPTION
BYPASS 11 Tap to voltage divider for internal mid-supply bias generator
CLK 17 I
If a 47-nF capacitor is attached, the TPA0232 generates an internal clock. An external clock can override
the internal clock input to this terminal.
GND
1, 12
13, 24
Ground connection for circuitry. Connected to thermal pad.
LHPIN 6 I Left channel headphone input, selected when SE/BTL is held high
LIN 10 I Common left input for fully differential input. AC ground for single-ended inputs.
LLINEIN 5 I Left channel line negative input, selected when SE/BTL is held low
LOUT+ 4 O Left channel positive output in BTL mode and positive output in SE mode
LOUT– 9 O Left channel negative output in BTL mode and high-impedance in SE mode
HP/LINE 2 I
HP/LINE is the input MUX control input. When the HP/LINE terminal is held high, the headphone inputs
(LHPIN or RHPIN [6, 20]) are active. When the HP/LINE
terminal is held low, the line BTL inputs (LLINEIN
or RLINEIN [5, 23]) are active.
PC-BEEP 14 I
The input for PC Beep mode. PC-BEEP is enabled when a > 1-V (peak-to-peak) square wave is input
to PC-BEEP.
PV
DD
7, 18 I Power supply for output stage
RHPIN 20 I Right channel headphone input, selected when SE/BTL is held high
RIN 8 I Common right input for fully differential input. AC ground for single-ended inputs.
RLINEIN 23 I Right channel line input, selected when SE/BTL is held low
ROUT+ 21 O Right channel positive output in BTL mode and positive output in SE mode
ROUT– 16 O Right channel negative output in BTL mode and high-impedance in SE mode
SE/BTL 15 I Hold SE/BTL low for BTL mode and hold high for SE mode.
SHUTDOWN 22 I
When held low, this terminal places the entire device, except PC-BEEP detect circuitry, in shutdown
mode.
V
DD
19 I Analog V
DD
input supply. This terminal needs to be isolated from PV
DD
to achieve highest performance.
VOLUME 3 I
VOLUME detects the dc level at the terminal and sets the gain for 31 discrete steps covering a range of
20 dB to –40 dB for dc levels of 0.15 V to 3.54. When the dc level is over 3.54 V, the device is muted.
TPA0232
STEREO 2-W AUDIO POWER AMPLIFIER
WITH DC VOLUME CONTROL AND MUX CONTROL
SLOS286 – NOVEMBER 1999
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage, V
DD
6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
–0.3 V to V
DD
+0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation internally limited (see Dissipation Rating Table). . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
–40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating junction temperature range, T
J
–40°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
DISSIPATION RATING TABLE
PACKAGE
T
A
≤ 25°C DERATING FACTOR T
A
= 70°C T
A
= 85°C
PWP 2.7 W
§
21.8 mW/°C 1.7 W 1.4 W
§
Please see the Texas Instruments document,
PowerPAD Thermally Enhanced Package Application Report
(literature number SLMA002), for more information on the PowerPAD package. The thermal data was
measured on a PCB layout based on the information in the section entitled
Texas Instruments Recommended
Board for PowerPAD
on page 33 of the before mentioned document.
recommended operating conditions
MIN MAX UNIT
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Supply voltage, V
DD
ÁÁÁ
ÁÁÁ
4.5
ÁÁÁ
ÁÁÁ
5.5
ÁÁÁ
ÁÁÁ
V
High level in
p
ut voltage V
IH
SE/BTL, HP/LINE 4
V
High
-
le
v
el
inp
u
t
v
oltage
,
V
IH
SHUTDOWN 2
V
Low level in
p
ut voltage V
IL
SE/BTL, HP/LINE 3
V
Lo
w-
le
v
el
inp
u
t
v
oltage
,
V
IL
SHUTDOWN 0.8
V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Operating free-air temperature, T
A
ÁÁÁ
ÁÁÁ
–40
ÁÁÁ
ÁÁÁ
85
ÁÁÁ
ÁÁÁ
°C
electrical characteristics at specified free-air temperature, V
DD
= 5 V, T
A
= 25°C (unless otherwise
noted)
PARAMETER TEST CONDITIONS
MIN TYP MAX UNIT
ÁÁÁÁ
ÁÁÁÁ
|V
OO
|
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Output offset voltage (measured differentially)
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
V
I
= 0, A
v
= 2 V/V
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
25
ÁÁÁ
ÁÁÁ
mV
ÁÁÁÁ
ÁÁÁÁ
PSRR
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Power supply rejection ratio
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
V
DD
= 4 V to 5 V
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
67
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
dB
|I
IH
| High-level input current
V
DD
= 5.5 V,
V
I
= V
DD
ÁÁÁ
Á
Á
Á
ÁÁÁ
ÁÁÁ
Á
Á
Á
ÁÁÁ
ÁÁÁ
Á
Á
Á
ÁÁÁ
900
ÁÁÁ
Á
Á
Á
ÁÁÁ
nA
|I
IL
| Low-level input current
V
DD
= 5.5 V,
V
I
= 0 V
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
900
ÁÁÁ
ÁÁÁ
nA
Z
I
Input impedance
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
See Figure 28
ÁÁÁ
ÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
I
DD
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Su
pp
ly current
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
BTL mode
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
10
ÁÁÁ
ÁÁÁ
15
ÁÁÁ
ÁÁÁ
mA
ÁÁÁÁ
ÁÁÁÁ
I
DD
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
S
u
ppl
y
c
u
rrent
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
SE mode
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
5
ÁÁÁ
ÁÁÁ
7.5
ÁÁÁ
ÁÁÁ
mA
ÁÁÁÁ
ÁÁÁÁ
I
DD(SD)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Supply current, shutdown mode
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
150
ÁÁÁ
ÁÁÁ
300
ÁÁÁ
ÁÁÁ
µA
TPA0232
STEREO 2-W AUDIO POWER AMPLIFIER
WITH DC VOLUME CONTROL AND MUX CONTROL
SLOS286 – NOVEMBER 1999
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
operating characteristics, V
DD
= 5 V, T
A
= 25°C, R
L
= 4 Ω, Gain = 2 V/V, BTL mode (unless otherwise
noted)
PARAMETER TEST CONDITIONS
MIN TYP MAX UNIT
ÁÁÁÁ
ÁÁÁÁ
P
O
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
Output power
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
THD = 1%,
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
f = 1 kHz
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
2
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
W
ÁÁÁÁ
ÁÁÁÁ
THD + N
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
Total harmonic distortion plus noise
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
P
O
= 1 W,
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
f = 20 Hz to 15 kHz
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
0.4%
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
B
OM
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
Maximum output power bandwidth
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
THD = 5%
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
>15
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
kHz
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
Su
pp
ly ri
pp
le rejection ratio
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
f = 1 kHz,
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
BTL mode
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
65
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
dB
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
S
u
ppl
y
ripple
rejection
ratio
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
,
C
B
= 0.47 µF
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
SE mode
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
60
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
dB
ÁÁÁÁ
V
ÁÁÁÁÁÁÁÁÁÁÁ
Noise out
p
ut voltage
ÁÁÁÁÁÁ
C
B
= 0.47 µF,
ÁÁÁÁÁÁÁ
BTL mode
ÁÁÁ
ÁÁÁ
34
ÁÁÁ
ÁÁÁ
µV
RMS
ÁÁÁÁ
ÁÁÁÁ
V
n
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
Noise
o
u
tp
u
t
v
oltage
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
B
µ
f = 20 Hz to 20 kHz
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
SE mode
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
44
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
µ
V
RMS
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
vs Output power 1, 4, 6, 8, 10
THD+N
Total harmonic distortion
p
lus noise
vs Gain 2
THD
+
N
Total
harmonic
distortion
pl
u
s
noise
vs Frequency 3, 5, 7, 9, 11
vs Output voltage 12
V
n
Output noise voltage vs Frequency 13
Supply ripple rejection ratio vs Frequency 14, 15
Crosstalk vs Frequency 16, 17, 18
Shutdown attenuation vs Frequency 19
SNR Signal-to-noise ratio vs Frequency 20
Closed loop response 21, 22
P
O
Output power vs Load resistance 23, 24
P
D
Power dissi
p
ation
vs Output power 25, 26
P
D
Po
w
er
dissipation
vs Ambient temperature 27
Z
I
Input impedance vs Gain 28
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