Tai-1 Microelectronics
www.taimec.com.tw
/
www.class-d.com.tw
Preliminary
TMPA208DS
Rev.1.0
June 27, 2006
2.5W STEREO CLASS-D AUDIO POWER AMPLIFIER WITH VOLUME CONTROL
GENERAL DESCRIPTION
The TMPA208DS is a stereo class-D audio power
amplifier with volume control. It delivers up to
2.5W/ch(5W in all) into a 3 ohm load or 2W/ch(4W
in all) into a 4 ohm load or 1.25W/ch(2.5W in all)
into an 8 ohm load.
With differential input structure, TMPA208DS
features high Common Mode Rejection Ratio and
Power Supply Rejection Ratio.
Analog input signal is converted into digital
output which drives directly to the speaker. High
power efficiency is achieved due to digital output
at the load. The audio information is embedded in
PWM（Pulse Width Modulation）.
DC
volume
control
is
convenient
for
LCD
FEATURES
♦
2.5V to 6V Single Supply
♦
Up to 5Wrms Max. Power or 2.5Wrms/ch.
♦
Up to 86% Power Efficiency
♦
3mA /Ch Quiescent Current
♦
Less Than 0.2uA /Ch Shutdown Current
♦
Pop-less Power-Up, Shutdown and Recovery
♦
Differential 230 KHz PWM Allows Bridge-Tied Load to
Increase Output Power
♦
DC Volume Control
♦
BTL Output Requires No Output Capacitors
♦
Thermal Shutoff and Automatic Recovery
♦
Output Pin Short-Circuit Protection (Short to Other
Outputs, Short to VCC, Short to Ground)
♦
Compatible with earphone application
♦
Differential
Signal
Processing
Improves
CMRR
&
projectors, LCD monitors, powered speakers, and
other consumer products especially when using
remote control.
APPLICATIONS
Multimedia application includes Cellular Phones,
PDAs, DVD/CD players, TFT LCD TVs/Monitors,
LCD Projectors, 2.1 channel audio systems,
Powered Speakers, USB audio. It is also ideal for
other portable devices like Wireless Radios.
Eliminates Power Regulation
♦
Package：TSSOP20 Available
For best performance, please refer to
http://www.taimec.com.tw/English/EVM.htm
http://www.class-d.com.tw/English/EVM.htm
for PCB layout.
Tai-1 Microelectronics Corp. reserves the right to make changes to its products and services and to
discontinue any product or service without notice. Customers should obtain the latest relevant information for
reference. Testing and quality control techniques are used to screen the parameters. Testing of all
parameters of each product is not necessarily performed.
Copyright
©2005,Tai-1
Microelectronics Corp.
1
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Tai-1 Microelectronics
www.taimec.com.tw
/
www.class-d.com.tw
Preliminary
TMPA208DS
Rev.1.0
June 27, 2006
REFERENCE CIRCUIT（Please refer to TMPA002.APP for application）
TOP VIEW
（Please
email david@taimec.com.tw for complete datasheet.）
Tai-1 Microelectronics reserves the right to make corrections, modifications, enhancements, improvements, and other
changes to its products and services at any time and to discontinue any product or service without notice. Customers are
responsible for their products and applications using Tai-1 Microelectronics components.
Note that the external components or PCB layout should be designed not to generate abnormal
voltages to the chip to prevent from latch up which may cause damage to the device.
Copyright
©2005,Tai-1
Microelectronics Corp.
2
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Tai-1 Microelectronics
www.taimec.com.tw
/
www.class-d.com.tw
Preliminary
TMPA208DS
Rev.1.0
June 27, 2006
Typical Application
J1
PHONEJACK STEREO
R10
0k
LIN+
R4
100
R7
5k
R6
C11
1uF
LOUT+
L1
33u
C1
1uF
VDD
LOUT-
L2
C14
1uF
33u
5k
SDN
R1
10k
C7
C15
1nF C8
1uF
1uF
J2
1 LINN RINN
20
2 LINP RINP
19
SDNB BYPASS
3
18
4 PVDDLPVDDR
17
5 LOUTP ROUTP
16
6 PGNDLPGNDR
15
LOUTNROUTN
7
14
PVDDLPVDDR
8
13
9 NC VOLUME
12
10AGND AVDD
11
TMPA208DS
+ C2
C5
470uF 1uF
C9
1uF
C10
1uF
R8
C16
1nF
R9
5k
R5
100
RIN+
5k
C12
1uF
L3
C3
1uF
R12
33u
ROUT+
ROUT-
switch S1
C4 1uF
C6
470uF
VDD
L4
VOLUME
33u
C13
1uF
TERMINAL FUNCTIONS
TERMINAL
I/O
NAME
AGND
BYPASS
LINN
LINP
LOUTN
LOUTP
NC
PGNDL
PGNDR
PVDDL
PVDDR
RINN
RINP
ROUTN
ROUTP
SDNB
AVDD
VOLUME
PIN NO
10
18
1
2
7
5
9
6
15
4,8
13,17
20
19
14
16
3
11
12
－
O
I
I
O
O
－
－
－
－
－
I
I
O
O
I
－
I
Analog ground
Bypass
Negative differential input for left channel
Positive differential input for left channel
Negative output for left channel
Positive output for left channel
No connection
Ground for left channel H-bridge
Ground for right channel H-bridge
Power supply for left channel H-bridge
Power supply for right channel H-bridge
Negative differential input for right channel
Positive differential input for right channel
Negative output for right channel
Positive output for right channel
Places the amplifier in shutdown mode if a TTL logic low is placed on this terminal;
normal operation if a TTL logic high is placed on this terminal
Analog power supply
DC Volume control
DESCRIPTION
Copyright
©2005,Tai-1
Microelectronics Corp.
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+
AVDD
R2
50k
33k
R3
100
VDD
3
Tai-1 Microelectronics
www.taimec.com.tw
/
www.class-d.com.tw
Preliminary
TMPA208DS
Rev.1.0
June 27, 2006
ABSOLUTE MAXIMUM RATINGS
Over operating free-air temperature range unless otherwise noted
Supply voltage range, V
DD
, PV
DD
Input voltage range, V
I
Continuous total power dissipation
Operating free-air temperature, T
A
Operating junction temperature range, T
J
Storage temperature range, T
stg
(1)
0.3V to 6V
0V to 5.5V
See Dissipation Rating Table
-20
。
C
to 85
。
C
-20
。
C
to 150
。
C
-65
。
C
to 150
。
C
(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.
DISSIPATION RATINGS TABLE
PACKAGE
TSSOP20(FD)
T
A
≤25
。
C
2.18W
DERATING FACTOR
21.8mW/
。
C
T
A
=70
。
C
1.2W
T
A
=85
。
C
872mW
RECOMMENDED OPERATING CONDITIONS
MIN
Supply voltage, V
DD
High-level input voltage, V
IH
Low-level input voltage, V
IL
PWM frequency
Operating free-air temperature, T
A
Operating junction temperature, T
J
SDNB
SDNB
200
-20
-20
2.5
2
0.8
300
85
125
TYP
MAX
6
UNIT
V
V
V
KHz
。
。
C
C
ELECTRICAL CHARACTERISTICS
T
A
=25
。
V
DD
=PV
DD
=5V
(unless otherwise noted)
C,
PARAMETER
½V
OS
½
PSSR
│I
IH
│
│I
IL
│
I
DD
I
DD（SD）
r
ds（on）
Av
Ri
Power supply rejection ratio
High-level input current
Low-level input current
Supply current
Supply current in shutdown mode
Drain-source on-state resistance
Voltage gain
Input resistance
TEST CONDITIONS
V
DD
=PV
DD
=3.5V to 5.5V
V
DD
=AV
DD
=5.5V,
V
I
=5.8V (SDNB)
V
DD
=AV
DD
=5.5V,
V
I
=-0.3V (SDNB)
No load
SDNB=0V
V
DD
=5V, I
O
=500mA,
T
J
=25
C
VOLUME=2.8V~0V
。
MIN
TYP
25
-70
30
MAX
50
UNIT
mV
dB
μA
Output offset voltage（measured differentially） V
I
=0V, A
V
=20dB, R
L
=8Ω
1
6
50
High side
Low side
24
450
450
18
200
10
1000
600
600
μA
mA
nA
mΩ
dB
kΩ
R
L
=8Ω, VOLUME=2.8V
Copyright
©2005,Tai-1
Microelectronics Corp.
4
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Tai-1 Microelectronics
www.taimec.com.tw
/
www.class-d.com.tw
Preliminary
TMPA208DS
Rev.1.0
June 27, 2006
OPERATING CHARACTERISTICS
T
A
=25
。
V
DD
=PV
DD
=5V, R
L
=8Ω speaker, Gain=18dB
(unless otherwise noted)
C,
PARAMETER
P
O
THD+N
Output power per channel
(Limited by thermal condition)
Total harmonic distortion plus noise
Thermal trip point
Thermal hysteresis
Vn
SNR
Crosstalk
Integrated noise floor
Signal-to-noise ratio
Crosstalk between outputs
20 Hz to 20 kHz, inputs ac grounded
V
DD
=AV
DD
=5V, P
O
=1W, R
L=
8Ω
V
DD
=AV
DD
=5V, P
O
=1W R
L
=8Ω
TEST CONDITIONS
f=1kHz, R
L
=3Ω, stereo operation
f=1kHz, R
L
=4Ω, stereo operation
f=1kHz, R
L
=8Ω, stereo operation
R
L
=8Ω, P
O
=1.2W, f=1kHz
MIN
TYP
2.5
2
1.25
0.4％
150
20
85
95
-68
。
。
MAX
UNIT
W
W
W
C
C
µVrms
dB
dB
VOLTAGE RANGE OF
“VOLUME”
AT DIFFERENT VDD
VDD
5V
3.6V
3V
MAX
2.8V
1.9V
1.3V
MIN
0V
0V
0V
VOLTAGE GAIN AT
T
A
=25
。
R
L
=8Ω
C,
V
DD
=PV
DD
=5V
5V
3.6V
3V
VOLTAGE GAIN
18dB/-27dB
18dB/-27dB
16dB/-27dB
VOLTAGE of VOLUME
2.8V/0V
1.9V/0V
1.4V/0V
Copyright
©2005,Tai-1
Microelectronics Corp.
5
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