Tai-1 Microelectronics
www.taimec.com.tw
/
www.class-d.com.tw
Preliminary
TMPA2155DS
Rev.1.0
June 27, 2006
2.7W/CH STEREO CLASS-D AUDIO POWER AMPLIFIER
GENERAL DESCRIPTION
The TMPA2155DS is a stereo class-D audio power amplifier
IC. With BTL(Bridge-Tied-Load) configuration, it delivers up
to 2.7W/ch(5.4W in all) into a 3 ohm load or 2.3W/ch(4.6W in
all) into a 4 ohm load or 1.5W/ch(3W in all) into an 8 ohm load.
No external heat-sink is required.
♦
2.2mA / Ch Quiescent Current at 5V
For multiple-input applications, independent gain control and
corner frequency can be implemented by summing the input
sources through resistor ratio and input capacitor values.
Automatic voltage gain control makes the best use of battery.
♦
Less Than 0.2uA / Ch Shutdown Current
♦
Pop-less Power-Up, Shutdown and Recovery
♦
Differential 250 KHz PWM Allows Bridge-Tied Load to
Doubles Output Power and Eliminates LC Output Filter
♦
Thermal Shutoff and Automatic Recovery
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）
.
Outputs, Short to VCC, Short to Ground)
♦
Differential Signal Processing Improves CMRR
♦
Compatible with earphone application
♦
Output
Pin Short-Circuit
Protection (Short to Other
FEATURES
♦
2.5V to 6V Single Supply
♦
Up to 2.7W / Ch at 5V, 3 ohms
♦
Up to 85% Power Efficiency
♦
Automatic output power control (APC)
APPLICATIONS
Multimedia application includes Cellular Phones, PDAs,
DVD/CD players, TFT LCD TVs/Monitors, 2.1 channel/5.1
channel audio systems, USB audio. It is also ideal for other
portable devices like Wireless Radios.
Package
TSSOP20, QFN24 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.
REFERENCE CIRCUIT（Please refer to TMPA002.APP for application）
Copyright©2005, Tai-1 Microelectronics Corp.
1
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www.taimec.com.tw
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Preliminary
TMPA2155DS
Rev.1.0
June 27, 2006
（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.
Typical Application
VD
D
C16
1uF
(6.3V
)
JP1
J1
C1
1uF
(6.3V)
PH
ONEJACKSTE
REO
C2
1uF
(6.3V)
C3
1uF
(6.3V)
C4
1uF
(6.3V
)
R3
330
R4
330
R12
0
R6
22k
R7
22k
R8
22k
22k
C17
1uF
(6.3V)
C13 470uF(6.3V)
+
C11
1uF
(6.3V
)
C14
470p(6.3V)
UTP GN
D
1 LO
20
D
UTN
2 VD LO 19
VD
D
3 NC
18
P
4 LIN SDNB
17
N
DD
5 LIN AV 16
N
ND
6 RIN AG 15
P CAP
7 RIN
14
VD
D
8 NC
13
UTN
D
9 VD RO 12
D
UTP GN
10RO
11
2155DS(FD)
C5
1uF
(6.3V)(optional)
R5
C6
1uF
(6.3V)
SDN
100
R10
10K
L2
33uH
L1
33uH
VO
1+
C9
1uF
(6.3V
)
VO
1-
C10
1uF
(6.3V
)
LS2
C15
R9 470p(6.3V)
swich S1
t
L3
VO
2-
C8
1uF
(6.3V)
33uH
C7
1uF
(6.3V)(optional)
L4
33uH
VO
2+
C12
1uF
(6.3V
)
LS1
J3
VR
ABSOLUTE MAXIMUM RATINGS
Over operating free-air temperature range unless otherwise noted(1)
Supply voltage, V
DD,
AV
DD
Input voltage, V
I
Continuous total power dissipation
Operating free-air temperature, T
A
Operating junction temperature, T
J
Storage temperature, T
stg
In normal mode
In shutdown mode
-0.3V to 6V
-0.3V to 7V
-0.3V to V
DD
+0.3V
V
V
V
See package dissipation ratings
。
-20 to 85
C
-20 to 150
-40 to 150
。
C
。
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.
Copyright©2005, Tai-1 Microelectronics Corp.
2
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Tai-1 Microelectronics
www.taimec.com.tw
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Preliminary
TMPA2155DS
Rev.1.0
June 27, 2006
RECOMMENDED OPERATING CONDITONS
MIN
Supply voltage, V
DD,
AV
DD
High-level input voltage, V
IH
Low-level input voltage, V
IL
Operating free-air temperature, T
A
SDNB
SDNB
2.5
2
0
-20
NOM
MAX
6
V
DD
0.8
85
UNIT
V
V
V
。
C
PACKAGE DISSIPATION RATINGS
PACKAGE
TSSOP20
DERATING
FACTOR
8.73 mW/
。
C
T
A
≤
25
。
C
POWER RATING
1.09W
T
A
= 70
。
C
POWER RATING
698mW
T
A
= 85
。
C
POWER RATING
567mW
ELECTRICAL CHARACTERISTICS
T
A
=25
。
(unless otherwise noted)
C
PARAMETER
│V
OS
│
PSRR
CMRR
│I
IH
│
│I
IL
│
I
Q
I
Q
(SD)
rDS(on)
f(sw)
*Av
R
SDN
Z
I
Output
offset
voltage
(measured
differentially)
Power supply rejection ratio
Common mode rejection ratio
High-level input current
Low-level input current
Quiescent current / Ch
Shutdown current / Ch
Static output resistance
Switching frequency
BTL Gain
Resistance from shutdown to GND
Input impedance
TEST CONDITIONS
V
I
=0V,A
V
=2, V
DD
=AV
DD
=2.5V to 5.5V
V
DD
=AV
DD
=2.5V to 5.5V
V
DD
=AV
DD
=2.5V to 5.5V,
V
IC
=1Vpp, RL=8Ω
V
DD
=AV
DD
=5.5V,
V
I
=5.8V (SDNB)
V
DD
=AV
DD
=5.5V,
V
I
=-0.3V (SDNB)
V
DD
=AV
DD
=5V, no load
V
( SDN )
=0.8V, V
DD
=AV
DD
=2.5V to 5.5V
V
DD
=AV
DD
=5.5V
V
DD
=AV
DD
=2.5V to 5.5V
V
DD
=AV
DD
=2.5V to 5.5V, RL=8Ω
V
(
SDNB
)
=5V
RINN,RINP,LINN,LINP
MIN
TYP
25
-75
-55
30
MAX
UNIT
mV
-55
-50
dB
dB
μA
1
2.2
0.2
790
230
12
280
16
200
15
330
20
3
0.5
μA
mA
μA
mΩ
kHz
V
V
kΩ
kΩ
*The gain of the amplifier is determined by, for V
DD
=V
DDA
=2.5V to 5.5V
Gain
=
320kohms
Ri
+
15kohms
where Ri is the external serial resistance at the input pin.
Copyright©2005, Tai-1 Microelectronics Corp.
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Preliminary
TMPA2155DS
Rev.1.0
June 27, 2006
OPERATING CHARACTERISTICS
T
A
=25
。
R
L
=8Ω
speaker (unless otherwise noted)
C,
PARAMETER
R
L
=8Ω
P
O
Output power / Ch
(Limited by thermal condition)
R
L
=4Ω
R
L
=3Ω
V
DD
=AV
DD
=5V, P
O
=0.85W, R
L=
8Ω, f=1kHz
THD+N
Total harmonic distortion plus noise
V
DD
=AV
DD
=5V, P
O
=1.3W, R
L=
4Ω, f=1kHz
V
DD
=AV
DD
=5V, P
O
=1.5W, R
L=
3Ω, f=1kHz
SNR
Crosstalk
Signal-to-noise ratio
Crosstalk between outputs
V
DD
=AV
DD
=5V, P
O
=1W, R
L=
8Ω
V
DD
=AV
DD
=5V, P
O
=1W R
L
=8Ω
V
DD
=AV
DD
=5V.
THD+N=10%,f=1kHz.
TEST CONDITIONS
MIN TYP MAX
1.5
2.3
2.7
0.55
0.55
0.64
95
-68
UNIT
W
W
W
%
dB
dB
TERMINAL FUNCTIONS
TERMINAL
I/O
NAME
AGND
AV
DD
CAP
GND
LINN
LINP
LOUTN
LOUTP
NC
RINN
RINP
ROUTN
ROUTP
SDNB
V
DD
PIN NO
15
16
14
11,20
5
4
19
1
3,8
6
7
12
10
17
2,9,13,18
-
-
I
-
I
I
O
O
-
I
I
O
O
I
-
Analog ground
Analog Power supply
Capacitance for power up delay
Digital ground
Negative input of left channel
Positive input of left channel
Negative output of left channel
Positive output of left channel
No Connection
Negative input of right channel
Positive input of right channel
Negative output of right channel
Positive output of right channel
Shutdown terminal (active low logic)
Digital Power supply
DESCRIPTION
TYPICAL CHARACTERISTICS
Note 1. Input coupling 1µF capacitors are used for all measurements.
2. Differential inputs are applied and BTL outputs are measured.
3. Balanced LC filter is used for THD+N measurement and power efficiency measurement.
4. Characteristic frequency of the LC filter is set 41KHz unless otherwise specified.
Copyright©2005, Tai-1 Microelectronics Corp.
4
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www.taimec.com.tw
/
www.class-d.com.tw
Preliminary
TMPA2155DS
Rev.1.0
June 27, 2006
APPLICATION INFORMATION
Copyright©2005, Tai-1 Microelectronics Corp.
5
PDF created with pdfFactory trial version
www.pdffactory.com
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