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TPA6021A4
Technical data
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TEXAS INSTRUMENTS TPA6021A4 Technical data

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-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
Volume [Pin 18] - V
DC VOLUME CONTROL
Volume - dB
BTL Volume
PGND
ROUT-
PV
DD
RIN+
RIN-
V
DD
LIN-
LIN+
PV
DD
LOUT-
1
ROUT+
SE/BTL
VOLUME
AGND
NC
BYPASS
FADE
SHUTDOWN
LOUT+
PGND
2
3
4
5
6
7
8
9
10
11
12
14
15
16
17
13
18
19
20
C
i
V
DD
V
DD
Right Positive
Differential Input Signal
Left Negative
Differential Input Signal
Right Negative
Differential Input Signal
Left Positive
Differential Input Signal
C
i
C
C
i
i
Power Supply
Power Supply
V
DD
100 kW
100 kW
C
330 FOm
C
330 FOm
0.47 Fm
0.47 Fm
0.47 Fm
0.47 Fm
0.47 Fm
0.47 Fm
0.47 Fm
C
10 FSm
C
0.47 F
(BYP)
m
In From DAC
or
Potentiometer
(DC Voltage)
System
Control
Right
Speaker
Left
Speaker
Headphones
1 kW
1 kW
2-W STEREO AUDIO POWER AMPLIFIER
WITH ADVANCED DC VOLUME CONTROL

FEATURES DESCRIPTION

• 2 W Into 4- Ω Speakers With External Heatsink
• DC Volume Control With 2-dB
Steps from -40 dB to 20 dB – Fade Mode – -85-dB Mute Mode
• Differential Inputs
• 1-µA Shutdown Current (Typical)
• Headphone Mode

APPLICATIONS

• LCD Monitors
TPA6021A4
SLOS465 – JUNE 2005
The TPA6021A4 is a stereo audio power amplifier that drives 2 W/channel of continuous RMS power into a 4- Ω load when utilizing a heat sink. Advanced dc volume control minimizes external components and allows BTL (speaker) volume control and SE (headphone) volume control.
The 20-pin DIP package allows for the use of a heatsink which provides higher output power.
To ensure a smooth transition between active and shutdown modes, a fade mode ramps the volume up and down.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
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 © 2005, Texas Instruments Incorporated
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TPA6021A4
SLOS465 – JUNE 2005
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
AVAILABLE OPTIONS
T
A
–40 ° C to 85 ° C TPA6021A4N

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range (unless otherwise noted)
V
SS
V
I
T
A
T
J
T
stg
(1) 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.
Supply voltage, VDD, PV Input voltage, RIN+, RIN-, LIN+,LIN- –0.3 V to VDD+0.3 V Continuous total power dissipation See Dissipation Rating Table Operating free-air temperature range –40 ° C to 85 ° C Operating junction temperature range –40 ° C to 150 ° C Storage temperature range –65 ° C to 85 ° C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260 ° C
DD
PACKAGE
20-PIN PDIP (N)
(1)
UNIT
–0.3 V to 6 V

DISSIPATION RATING TABLE

PACKAGE
N 1.8 W 14.5 mW/ ° C 1.16 W 0.94 W
(1) All characterization is done using an external heatsink with θSA= 25 ° C/W. The resulting derating factor
is 22.2 mW/ ° C.
TA= 25 ° C DERATING FACTOR TA= 70 ° C TA= 85 ° C
POWER RATING ABOVE TA= 25 ° C POWER RATING POWER RATING
(1)
2
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TPA6021A4
SLOS465 – JUNE 2005

RECOMMENDED OPERATING CONDITIONS

MIN MAX UNIT
V
SS
V
IH
V
IL
T
A

ELECTRICAL CHARACTERISTICS

TA= 25 ° C, V
| V
OO
PSRR Power supply rejection ratio V | IIH| 1 µA
| IIL| V
I
DD
I
DD
I
DD(SD)
Supply voltage, VDD, PV
High-level input voltage
Low-level input voltage
DD
SE/ BTL, FADE 0.8 x V SHUTDOWN 2 V SE/ BTL, FADE 0.6 x V SHUTDOWN 0.8 V
4 5.5 V
DD
Operating free-air temperature –40 85 ° C
= PV
DD
= 5.5 V (unless otherwise noted)
DD
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
= 5.5 V, Gain = 0 dB, SE/ BTL = 0 V 30 mV
| Output offset voltage (measured differentially)
High-level input current (SE/ BTL, FADE, SHUT- V DOWN, VOLUME) VI= V
Low-level input current (SE/ BTL, FADE, SHUT­DOWN, VOLUME)
Supply current, no load mA
Supply current, max power into a 4- Ω load SHUTDOWN = 2 V, RL= 4 Ω , 1.3 A
DD
V
= 5.5 V, Gain = 20 dB, SE/ BTL = 0 V 50 mV
DD
= PV
DD DD
DD
V
DD
SHUTDOWN = 2 V V
DD
SHUTDOWN = 2 V V
DD
= 4 V to 5.5 V –42 –70 dB
DD
= PV
= 5.5 V,
DD
= PV
DD
DD
= PV
= 5.5 V, VI= 0 V 1 µA
DD
= PV
= 5.5 V, SE/ BTL = 0 V,
DD
= PV
= 5.5 V, SE/ BTL = 5.5 V,
DD
= 5 V = PV
, SE/ BTL = 0 V,
DD
6 7.5 9
3 5 6
PO= 2 W, stereo
Supply current, shutdown mode SHUTDOWN = 0 V 1 20 µA
DD
V
V
RMS

OPERATING CHARACTERISTICS

TA= 25 ° C, V
P
O
THD+N Total harmonic distortion + noise PO= 1 W, RL= 8 Ω , f = 20 Hz to 20 kHz <0.8% V
OH
V
OL
V
(Bypass)
Z
I
(1) Requires an external heatsink with θSA≤ 25 ° C/W.
= PV
DD
= 5 V, RL= 4 Ω , Gain = 20 dB, Stereo, External Heatsink (unless otherwise noted)
DD
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Output power W
High-level output voltage RL= 8 Ω , Measured between output and V Low-level output voltage 400 mV Bypass voltage (Nominally VDD/2) Measured at pin 16, No load, V
Supply ripple rejection ratio f = 1 kHz, Gain = 0 dB, C
Noise output voltage BTL 36 µV
THD = 1%, f = 1 kHz 1.5 THD = 10%, f = 1 kHz, V
= 5 V 2
DD
= 5.5 V 700 mV
DD
RL= 8 Ω , Measured between output and GND, V
= 5.5 V
DD
= 5.5 V 2.65 2.75 2.85 V
DD
= 0.47 µF
(BYP)
BTL –82 dB SE –57 dB
f = 20 Hz to 20 kHz, Gain = 0 dB, C
= 0.47 µF
(BYP)
Input impedance (see Figure 18 ) VOLUME = 5 V 14 k Ω
(1) (1)
RMS
3
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1
2
3
4
5
6
7
8
9
10
20
ROUT+PGND
19
SE/BTL
ROUT-
18
VOLUME
PVDD
17
AGND
RIN+
16
BYPASS
RIN-
15
FADE
VDD
14
SHUTDOWN
LIN-
13
NC
LIN+
12
LOUT+
PVDD
1
PGND
1
LOUT-
TPA6021A4
SLOS465 – JUNE 2005
N (PDIP) PACKAGE
(TOP VIEW)
Terminal Functions
TERMINAL
NAME NO.
BYPASS 16 I Tap to voltage divider for internal midsupply bias generator used for analog reference FADE 15 I AGND 17 - Analog power supply ground
LIN- 7 I Left channel negative input for fully differential input. LIN+ 8 I Left channel positive input for fully differential input. LOUT– 10 O Left channel negative audio output LOUT+ 12 O Left channel positive audio output. NC 13 - No connection PGND 1, 11 - Power ground PVDD 3, 9 - Supply voltage terminal for power stage RIN- 5 I Right channel negative input for fully differential input. RIN+ 4 I Right channel positive input for fully differential input. ROUT– 2 O Right channel negative audio output ROUT+ 20 O Right channel positive audio output
SE/ BTL 19 I SHUTDOWN 14 I Places the amplifier in shutdown mode if a TTL logic low is placed on this terminal
VDD 6 - Supply voltage terminal VOLUME 18 I Terminal for dc volume control. DC voltage range is 0 to VDD.
I/O DESCRIPTION
Places the amplifier in fade mode if a logic low is placed on this terminal; normal operation if a logic high is placed on this terminal.
Output control. When this terminal is high, SE outputs are selected. When this terminal is low, BTL outputs are selected.
4
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FUNCTIONAL BLOCK DIAGRAM

Power
Management
32-Step
Volume
Control
Output Control
RIN+
ROUT+
SHUTDOWN
ROUT-
PV
DD
PGND
V
DD
BYPASS
AGND
LOUT-
LOUT+
RIN-
VOLUME
FADE
_
+
_
+
_
+
BYP
_
+
BYP
BYP
EN
SE/BTL
_
+
_
+
_
+
BYP
_
+
BYP
BYP
EN
SE/BTL
SE/BTL
LIN-
LIN+
TPA6021A4
SLOS465 – JUNE 2005
NOTE: All resistor wipers are adjusted with 32 step volume control.
5
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10
0.001
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
2
1
5
20 20 k50 100 200 500 1 k 2 k 5 k 10 k
P = 1.5 W
O
P = 0.25 W
O
f - Frequency - Hz
THD+N - Total Harmonic Distortion + Noise (BTL) - %
V = 5 V
R = 4 Gain = 20 dB
C = 0.47 F BTL Stereo
DD
L
I
W
m
P = 1 W
O
10
0.001
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
2
1
5
20 20 k50 100 200 500 1 k 2 k 5 k 10 k
P = 0.25 W
O
P = 0.5 W
O
f - Frequency - Hz
THD+N - Total Harmonic Distortion + Noise (BTL) - %
V = 5 V
R = 8 Gain = 20 dB
C = 0.47 F BTL Stereo
DD
L
I
W
m
P = 1 W
O
TPA6021A4
SLOS465 – JUNE 2005

TYPICAL CHARACTERISTICS

Table of Graphs

THD+N Total harmonic distortion plus noise (BTL)
(1)
vs Frequency 1, 2 vs Output power 5, 6 vs Frequency 3, 4
THD+N Total harmonic distortion plus noise (SE) vs Output power 7
vs Output voltage 8
Closed loop response 9, 10 P P
Power Dissipation vs Output power 11, 12
D
Output power vs Load resistance 13
O
Crosstalk vs Frequency 14, 15 PSRR Power supply ripple rejection (BTL) vs Frequency 16 PSRR Power supply ripple rejection (SE) vs Frequency 17 Z
Input impedance vs BTL gain 18
I
(1) All graphs were taken using an external heatsink with θSA= 25 ° C/W.
TOTAL HARMONIC DISTORTION + NOISE (BTL) TOTAL HARMONIC DISTORTION + NOISE (BTL)
vs vs
FREQUENCY FREQUENCY
FIGURE
6
Figure 1. Figure 2.
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10
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
20
20 k50 100 200 500 1 k 2 k 5 k 10 k
f - Frequency - Hz
THD+N - Total Harmonic Distortion + Noise (SE) - %
V = 5 V
R = 32 Gain = 14 dB
C = 0.47 F
SE Stereo
DD
L
I
W
m
C = 330 FOm
P = 75 WOm
10
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
20 20 k50 100 200 500 1 k 2 k 5 k 10 k
f - Frequency - Hz
THD+N - Total Harmonic Distortion + Noise (SE) - %
V = 1 V
O RMS
V = 5 V
R = 10 k Gain = 14 dB
C = 0.47 F
SE Stereo
DD
L
I
W
m
C = 330 FOm
10
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
5
0.020.01 0.05 0.1 0.2 0.5
1 2
PO- Output Power - W
THD+N - Total Harmonic Distortion + Noise (BTL) - %
20 Hz
V = 5 V
R = 4 Gain = 20 dB
C = 0.47 F BTL Stereo
DD
L
I
W
m
20 kHz
1 kHz
10
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
50.02
0.01
0.05 0.1 0.2 0.5 1 2
PO- Output Power - W
THD+N - Total Harmonic Distortion + Noise (BTL) - %
1 kHz
20 Hz
V = 5 V
R = 8 Gain = 20 dB
C = 0.47 F BTL Stereo
DD
L
I
W
m
20 kHz
TPA6021A4
SLOS465 – JUNE 2005
TOTAL HARMONIC DISTORTION + NOISE (SE) TOTAL HARMONIC DISTORTION + NOISE (SE)
vs vs
FREQUENCY FREQUENCY
Figure 3. Figure 4.
TOTAL HARMONIC DISTORTION + NOISE (BTL) TOTAL HARMONIC DISTORTION + NOISE (BTL)
vs vs
OUTPUT POWER OUTPUT POWER
Figure 5. Figure 6.
7
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10
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10 20 30 40
200
50 100
P
O
- Output Power - mW
THD+N - Total Harmonic Distortion + Noise (SE) - %
V = 5 V
R = 32 Gain = 14 dB
C = 0.47 F
SE Stereo
DD
L
I
W
m
C = 330 FOm
20 Hz
1 kHz
20 kHz
10
0.001
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
0 0.2 0.60.4
0.8
1
1.2
1.6
1.4
1.8
2
THD+N - T otal Harmonic Distortion + Noise (SE) - %
20 kHz
20 Hz
V - Output Voltage - rms
O
V = 5 V
R = 10 k Gain = 14 dB
C = 0.47 F
SE Stereo
DD
L
I
W
m
C = 330 FOm
1 kHz
150
120
90
60
30
0
-30
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
10 100 1 k 10 k 100 k 1 M
-180
-150
-120
-90
-60
180
Gain
Phase
V = 5 V
R = 8 Mode = BTL
Gain = 0 dB
DD
L
W
f - Frequency - Hz
Closed Loop Gain - dB
Phase - Degrees
150
120
90
60
30
0
-30
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
10 100 1 k 10 k 100 k 1 M
-180
-150
-120
-90
-60
180
Gain
Phase
f - Frequency - Hz
Closed Loop Gain - dB
Phase - Degrees
V = 5 V
R = 8 Mode = BTL
Gain = 20 dB
DD
L
W
TPA6021A4
SLOS465 – JUNE 2005
TOTAL HARMONIC DISTORTION + NOISE (SE) TOTAL HARMONIC DISTORTION + NOISE (SE)
vs vs
OUTPUT POWER OUTPUT VOLTAGE
Figure 7. Figure 8.
CLOSED LOOP RESPONSE CLOSED LOOP RESPONSE
Figure 9. Figure 10.
8
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