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TA0105A
STEREO CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING
DIGITAL POWER PROCESSING (DPP
T M
) TECHNOLOGY
Technical Information
Revision 2.2 – May 2005
GENERAL DESCRIPTION
The TA0105A is a two-channel Amplifier Driver IC that uses Tripath’s proprietary Digital Power
Processing (DPP
TM
) technology. Class-T amplifiers offer both the audio fidelity of Class-AB and the
power efficiency of Class-D amplifiers.
The typical application for the TA0105A is direct drive (no output transformer) in 70V and 100V
constant voltage amplifiers used for public address systems. The feedback and voltage range of
the TA0105A can be configured externally unlike previous Tripath modules such as TA0104A.
APPLICATIONS
FEATURES
Constant Voltage Amplifiers
Distribution Amplifiers
Pro-audio Amplifiers
BENEFITS
Reduced system cost with smaller/less
expensive power supply and heat sink
Signal fidelity equal to high quality Class-
AB amplifiers
No output transformer is needed due to
high supply voltage range
High dynamic range compatible with
digital media such as CD and DVD
C lass- T architec ture
Proprietary Digital Power Processing technology
High Supply Voltage Range
“Audiophile” Sound Quality
High Efficiency
Supports wide range of output power levels
Output over-current protection
Over- and under-voltage protection
38-pin Quad package
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TA0105A – RW/ Rev. 2.2/05.05
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Absolute Maximum Ratings
(Note 1)
SYMBOL
VPP, VNN Supply Voltage
V5
VN12
T
A
T
J
T
STORE
ESD
HB
ESD
MM
Positive 5V Controller Voltage
Voltage at Input Pins (pins 4-8, 10-11)
Voltage for FET drive
Operating Free-air Temperature Range
Junction Temperature
Storage Temperature Range
ESD Susceptibility – Human Body Model (Note 2)
All Pins
ESD Susceptibility – Machine Model (Note 3)
All Pins
PARAMETER
Value
+/-200
6
-0.3 to (V5+0.3)
VNN+18
0º to 70º
150º
-40º to 150º
2000
200
UNITS
V
V
V
V
C
C
C
V
V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
See the table below for Operating Conditions.
Note 2: Human body model, 100pF discharged through a 1.5KΩ resistor.
Note 3: Machine model, 220pF – 240pF discharged through all pins.
Operating Conditions
(Note 4)
SYMBOL
VPP, VNN Supply Voltage (Note 4)
V5
VN12
Positive 5V Controller Voltage
Voltage for FET drive (Volts about VNN)
PARAMETER
MIN.
+/-125
4.5
10.8
TYP.
+/-148
5
12
MAX.
+/-185
5.5
13.2
UNITS
V
V
V
Note 4: Recommended Operating Conditions indicate conditions for which the device is functional.
The VPP and VNN supply limits are based on the internal OV/UV sensing resistor values. The
supply voltage range can be lowered via external resistors. Please refer to the Application
information section for a detailed discussion of changing the operating supply voltage range. See
Electrical Characteristics for guaranteed specific performance limits.
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TA0105A – RW/ Rev. 2.2/05.05
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Electrical Characteristics
(Note 5)
T
A
= 25
°C.
See Application/Test Circuit on page 7. Unless otherwise noted, the supply voltage is
VPP=|VNN|=148V. See note 8.
SYMBOL
I
q
PARAMETER
Quiescent Current
(No load, BBM0=1,BBM1=0,
Mute = 0V)
Quiescent Current
(No load, BBM0=1,BBM1=0,
Mute = 0V)
Mute Supply Current
(No load, Mute = 5V)
Power Supply Current
(Vo = 100Vrms, R
L
= 50Ω)
Power Supply Current
(Vo = 70.7Vrms, R
L
= 25Ω)
High-level input voltage (MUTE)
Low-level input voltage (MUTE)
High-level output voltage (HMUTE) RL = 10kohm
Low-level output voltage (HMUTE) RL = 10kohm
Output Offset Voltage
Over Current Sense Voltage
Threshold
VPP Threshold Voltages
No Load, MUTE = Logic low,
Measured without external trim
circuit connected
Exceeding this threshold causes a
latched mute condition
Over-voltage turn on (muted)
Over-voltage restart (mute off)
Under-voltage restart (mute off)
Under-voltage turn on (muted)
Over-voltage turn on (muted)
Over-voltage restart (mute off)
Under-voltage restart (mute off)
Under-voltage turn on (muted)
Over-voltage turn on (muted)
Over-voltage restart (mute off)
Under-voltage restart (mute off)
Under-voltage turn on (muted)
Over-voltage turn on (muted)
Over-voltage restart (mute off)
Under-voltage restart (mute off)
Under-voltage turn on (muted)
-2.5
0.85
193
185
80
-193
-185
-80
147
140
60
-147
-140
-60
0.97
227
216
111
101
-221
-215
-110
-98
167
159
82
74
-166
-161
-82
-73
3.5
0.5
2.5
1.09
250
125
118
-250
-125
-118
185
95
85
-185
-95
-85
CONDITIONS
VPP = +148V
VNN = -148V
V5 = 5V
VN12 = 12V
VPP = +106V
VNN = -106V
V5 = 5V
VN12 = 12V
VPP = +148V
VNN = -148V
V5 = 5V
VN12 = 12V
VPP = +148V (Both Channels On)
VNN = -148V (Both Channels On)
VPP = +106 (Both Channels On)
VNN = -106 (Both Channels On)
3.5
1.0
MIN.
TYP.
35
40
45
120
30
35
45
130
1
1
20
1
1.5
1.5
2.1
2.1
MAX.
100
100
80
250
100
100
80
250
30
1.6
1.6
2.22
2.22
UNITS
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
A
A
A
A
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
I
q
I
MUTE
I
Po
I
Po
V
IH
V
IL
V
OH
V
OL
V
OFFSET
I
OC
V
VPPSENSE
V
VNNSENSE
VNN Threshold Voltages
V
VPPSENSE
VPP Threshold Voltages
(Externally shifted)
(Note 6)
V
VNNSENSE
VNN Threshold Voltages
(Externally shifted)
(Note 6)
Note 5: Minimum and maximum limits are guaranteed but may not be 100% tested.
Note 6: These voltage values are calculated and not 100% tested. The voltages are based on 100% tested
sense currents, an external “shift” resistor of 3.83MΩ from VLOW to VNN and another 3.83MΩ
resistor from VHIGH to VPP, and the on board sense resistor values of 1.27MΩ for VNN, and 1.4MΩ
for VPP. In addition, worse case resistor tolerances (+/-1%) were used to calculate the minimum and
maximum values. Please refer to the Overvoltage and Undervoltage section of the Applications
Information for a more detailed explanation.
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TA0105A – RW/ Rev. 2.2/05.05
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Electrical Characteristics
(Notes 7 and 8)
T
A
= 25
°C.
Unless otherwise noted, the supply voltage is VPP=|VNN|=148V, the input frequency is
1kHz and the measurement bandwidth is 20kHz. See Application/Test Circuit on page 7.
SYMBOL
P
OUT
PARAMETER
Output Power
(Continuous Output/Channel)
CONDITIONS
VPP=|VNN|=148V
THD+N = 0.1%, R
L
= 25Ω
THD+N = 1.0%, R
L
= 25Ω
VPP=|VNN|=106V
THD+N = 0.1%, R
L
= 12.5Ω
THD+N = 1.0%, R
L
= 12.5Ω
V
OUT
= 50Vrms, f = 1kHz, R
L
=
12.5Ω, VPP=|VNN|=106V
V
OUT
= 50Vrms, f = 7kHz, R
L
=
12.5Ω, VPP=|VNN|=106V
V
OUT
= 70.7Vrms, f = 1kHz, R
L
=
25.0Ω, VPP=|VNN|=148V
V
OUT
= 70.7Vrms, f = 7kHz, R
L
=
25.0Ω, VPP=|VNN|=148V
19kHz, 20kHz, 1:1 (IHF), R
L
= 50Ω
V
OUT
= 25Vrms/Channel
A Weighted, R
L
= 25Ω,
P
OUT
= 400W/Channel
0dBr = 100W, R
L
= 25Ω, f = 1kHz
V
OUT
= 100Vrms/Channel, R
L
=
50Ω, VPP=|VNN|=148V
V
OUT
= 70.7Vrms/Channel, R
L
=
25Ω, VPP=|VNN|=106V
P
OUT
= 10W/Channel, R
L
= 25Ω,
Rin = 34.8kΩ, See Application /
Test Circuit
P
OUT
= 10W/Channel, R
L
= 25Ω
See Application / Test Circuit
A-Weighted, input shorted, DC
offset nulled to zero
85
85
MIN.
TYP.
300
400
300
400
0.06
0.2
0.06
0.2
0.02
103
100
90
90
40.5
0.25
1.0
0.25
1.0
MAX.
UNITS
W
W
W
W
%
%
%
%
%
dB
dB
%
%
V/V
THD + N
THD + N
THD + N
THD + N
IHF-IM
SNR
CS
η
η
A
V
Total Harmonic Distortion Plus
Noise
Total Harmonic Distortion Plus
Noise
Total Harmonic Distortion Plus
Noise
Total Harmonic Distortion Plus
Noise
IHF Intermodulation Distortion
Signal-to-Noise Ratio
Channel Separation
Power Efficiency
Power Efficiency
Amplifier Gain
A
VERROR
e
NOUT
Channel to Channel Gain Error
Output Noise Voltage
-1
700
1
dB
µV
Note 7: Minimum and maximum limits are guaranteed but may not be 100% tested.
Note 8: Specific Components used:
Output MOSFETs (Q
O
): ST Microelectronics STW20NM50FD
Output Diodes (D
O
): International Rectifier MUR460
Feedback Resistors (R
FB
): 39.2Kohm, 1W
Gate Diodes (D
G
): General Semiconductor SS16
4
TA0105A – RW/ Rev. 2.2/05.05
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TA0105A Pinout
38
37
36
35
34
33
32
31
30
29
28
OCS2LP
LO2COM
HMUTE
OCS2LN
OCS2HN
OCS2HP
FDBKN2
VLOW
VHIGH
NC
1
AGND
OVERLOADB
PGND
LO2
27
2
HO2COM
26
3
V5
HO2
25
4
MUTE
VNN
24
5
IN2
IN1
BBM0
VPP
HO1
H01COM
23
22
21
20
6
7
8
GND KELVIN1
OCS1HN
LO1COM
BBM1
GND KELVIN2
OCS1HP
OCS1LN
OCS1LP
LO1
FDBKN1
OCR2
OCR1
9
10
11
12
13
14
15
16
17
18
5
VN12
19
TA0105A – RW/ Rev. 2.2/05.05
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