APA2020A
Stereo 2-W Audio Power Amplifier
Features
•
•
•
•
•
•
•
•
•
Low Supply Current , I
DD
= 8mA at Stereo BTL
Low Shutdown Current , I
DD
= 0.5µA
Depop Circuitry Integrated
Low Supply Voltage
Thermal Shutdown Circuitry Integrated
Output Power at 1% THD+N , V
DD
=5V
- 1.8 W/Ch (typ) into a 4
Ω
Load
- 1.2 W/Ch (typ) into a 8
Ω
Load
Bridge-Tied Load (BTL) or Single-Ended
(SE) Modes Operation
Various 24-Pin Power Packages Available
SOP , TSSOP-P
High Supply Voltage Ripple Rejection
General Description
The APA2020A is a stereo bridge-tied audio power
amplifier in various 24-pin power packages , includ-
ing SOP , TSSOP-P. When connecting to a 5V volt-
age supply , the APA2020A is capable of delivering
1.8W/1.2W of continuous RMS power per channel
into 4Ω/8Ω loads with less than 1% THD+N ,
respectively. The APA2020A simplifies design and
frees up board space for other features .
The APA2020A also served well in low-voltage
applications , which provides 800-mW per channel
into 4Ω loads with a 3.3V supply voltage . Both of the
depop circuitry and the thermal shutdown protection
circuitry are integrated in the APA2020A , that reduces
pops and clicks noise during power up and when
using the shutdown or mute modes and protects the
chip from being destroyed by over-temperature
failure.
To simplify the audio system design in notebook
computer applications , the APA2020A combines a
stereo bridge-tied loads (BTL) mode for speaker drive
and a stereo single-end (SE) mode for headphone
drive into a single chip , where both modes are easily
switched by the SE/BTL input control pin signal . For
power sensitive applications , the APA2020A also
features a shutdown function which keeps the supply
current only 0.5 µA (typ) .
Applications
•
Stereo Audio Power Amplifier for Notebook
Computer
Ordering Information
APA2020A
Handling Code
Temp. Range
Package Code
Package Code
K : SOP
Temp. Range
I: - 40 to 85
°
C
Handling Code
TU : Tube
TY : Tray
TR : Tape & Reel
R : TSSOP-P *
* TSSOP-P is a standard TSSOP package with a thermal pad exposure on the bottom of the package.
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
ANPEC Electronics Corp.
Rev. A.5 - July., 2002
1
www.anpec.com.tw
APA2020A
Block Diagram
MUX
MUX
MUX
SE/BTL
Absolute Maximum Ratings
(Over operating free-air temperature range unless otherwise noted.)
Symbol
V
CC
T
A
T
J
T
STG
T
S
V
ESD
Supply Voltage
Operating Ambient Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Soldering Temperature,10 seconds
Electrostatic Discharge
Parameter
Rating
6
-40 to 85
150
-65 to +150
300
-3000 to 3000
*1
-200 to 200
*2
Unit
V
°C
°C
°C
°C
V
Note: 1. Human body model : C=100pF , R=1500Ω , 3 positive pulses plus 3 negative pulses
2. Machine model : C=200pF , L=0.5mH , R=0Ω , 3 positive pulses plus 3 negative pulses
Copyright
ANPEC Electronics Corp.
Rev. A.5 - July., 2002
2
www.anpec.com.tw
APA2020A
Recommended Operating Conditions
Min.
Supply Voltage, V
DD
V
DD
=5V,
4-Ω stereo BTL drive,
Operating free-air 250mW/Ch average power, with proper PCB
temperature, T
A
design
V
DD
=5V,
2 W/Ch average power,
3-Ω stereo BTL drive,
with proper PCB design
and 300 CFM
forced-air cooling
3
-20
Typ.
5
Max.
5.5
85
Unit
V
°C
-20
85
V
DD
=5 V
Common mode
input voltage, V
ICM
V
DD
=3.3V
1.25
1.25
4.5
2.7
V
Electrical Characteristics (Cont.)
AC Operating Characteristics , V
DD
= 5V , T
A
= 25°C , R
L
= 4Ω (unless otherwise noted)
Symbol
P(out)
Parameter
Output power (each channel )
see Note 1
Test Condition
THD = 10% , BTL , R
L
=4Ω
R
L
=8Ω
THD = 1% , BTL , R
L
=4Ω
R
L
=8Ω
THD = 10% , SE , R
L
=4Ω
R
L
=8Ω
THD = 1% , SE , R
L
=4Ω
R
L
=8Ω
THD = 0.5% , SE , R
L
=32
Ω
THD + N Total harmonic distortion plus P
O
= 1.6W , BTL , R
L
=4Ω
noise
P
O
= 1W , BTL , R
L
=8Ω
P
O
= 78mW , SE ,R
L
=32Ω
V
1
= 1V , R
L
=4Ω
,
G = 1
B
OM
Maximum output power
bandwidth
Phase margin
G = 10 , THD < 1%
R
L
= 4Ω , BTL
R
L
= 4Ω , Open Load
R
L
= 4Ω , SE
APA2020A
Min. Typ. Max.
2.3
1.5
1.8
1.2
650
400
500
320
90
300
150
20
10
>20
72
71
52
°
KHz
m%
mW
W
Unit
Copyright
ANPEC Electronics Corp.
Rev. A.5 - July., 2002
3
www.anpec.com.tw
APA2020A
Electrical Characteristics (Cont.)
AC Operating Characteristics , V
DD
= 5V , T
A
= 25°C , R
L
= 4Ω (unless otherwise noted)
Symbol
PSRR
Parameter
Power supply ripple rejection
Mute attenuation
Channel-to-channel output
separation
Line HP input separation
BTL attenuation in SE mode
ZI
Vn
Input impedance
Signal-to-noise ratio
Output noise voltage
Po = 500 mW , BTL
Test Condition
f =100 Hz
APA2020A
Min. Typ. Max.
80
85
85
75
80
2
90
80
Unit
dB
dB
dB
dB
dB
MΩ
dB
µV(rms)
Notes 1 : Output power is meaured at the output teminals of the IC at 1 KHz.
AC Operating Characteristics , V
DD
= 3.3V , T
A
= 25°C , R
L
= 4Ω (unless otherwise noted)
APA2020A
Symbol
Parameter
Test Condition
Min. Typ. Max.
P(out) Output power (each channel )
1
THD = 10% , BTL , R
L
=4Ω
see Note 2
0.6
R
L
=8Ω
THD = 1% , BTL , R
L
=4Ω
R
L
=8Ω
THD = 10% , SE , R
L
=4Ω
R
L
=8Ω
THD = 1% , SE , R
L
=4Ω
R
L
=8Ω
THD = 0.5% , SE , R
L
=32
Ω
THD + N Total harmonic distortion plus P
O
= 1.6W , BTL , R
L
=4Ω
noise
P
O
= 1W , BTL , R
L
=8Ω
P
O
= 78mW , SE ,R
L
=32Ω
V
1
= 1V , R
L
=4Ω
,
G = 1
B
OM
Maximum output power
bandwidth
Phase margin
G = 10 , THD < 1%
R
L
= 4Ω , BTL
R
L
= 4Ω , Open Load
R
L
= 4Ω , SE
0.8
0.5
290
180
230
140
43
270
150
20
10
>20
92
70
57
Unit
W
mW
m%
KHz
°
Copyright
ANPEC Electronics Corp.
Rev. A.5 - July., 2002
4
www.anpec.com.tw
APA2020A
Electrical Characteristics (Cont.)
AC Operating Characteristics , V
DD
= 3.3V , T
A
= 25°C , R
L
= 4Ω (unless otherwise noted)
Symbol
PSRR
Parameter
Power supply ripple rejection
Mute attenuation
Channel-to-channel output
separation
Line HP input separation
BTL attenuation in SE mode
ZI
Vn
Input impedance
Signal-to-noise ratio
Output noise voltage
Po = 500 mW , BTL
f =1 KHz
Test Condition
f =100 Hz
APA2020A
Min. Typ. Max.
70
85
85
75
80
2
90
50
Unit
dB
dB
dB
dB
dB
MΩ
dB
µV(rms)
Notes 2 : Output power is meaured at the output teminals of the IC at 1 KHz.
DC Electrical Characteristic , T
A
=25 °C
Symbol
Parameter
Test Conditions
Stereo BTL
Stereo SE
V
DD
= 3.3 V Stereo BTL
Stereo SE
V
DD
=5V, Gain = 2, see Note3
V
DD
= 5V
APA2020
A
Typ.
Max.
8
11
4
6.5
7
9
3.5
5.6
5
25
8
0.5
11
5
Unit
mA
mA
mA
mA
mV
mA
µ
A
I
DD
Supply Current
V
O (DIFF)
I
DD(MUTE)
I
SD
DC Differential Output
Voltage
Supply Current in Mute Mode V
DD
= 5V
I
DD
in Shutdown
V
DD
= 5V
Note 3 : at 3V<V
DD
<5V , the DC output voltage is approximately V
DD
/ 2.
Copyright
ANPEC Electronics Corp.
Rev. A.5 - July., 2002
5
www.anpec.com.tw
Test/Measurement
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