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[ Pobierz całość w formacie PDF ]Tripath Technology, Inc. - Technical Information
TA0105A
STEREO CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING
DIGITAL POWER PROCESSING (DPP
TM
) TECHNOLOGY
PRELIMINARY INFORMATION – AUGUST 2002
Technical Information Revision 0.90 – August 2002
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.
Besides the typical application of Constant Voltage Amplification, the TA0105A supply range and
feedback structure can be adjusted to emulate legacy Tripath Amplifier Driver products such as the
TA0104A.
APPLICATIONS
FEATURES
Class-T architecture
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
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
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TA0105A – KL/ Rev. 0.90/08.02
Tripath Technology, Inc. - Technical Information
Absolute Maximum Ratings
(Note 1)
SYMBOL
PARAMETER
Value
UNITS
VPP, VNN
Supply Voltage
+/- 200
V
V5
Positive 5 V Bias Supply
Voltage at Input Pins (pins 12-16, 18, 19-26, 29-33, 37)
6
-0.3V to (V5+0.3V)
V
VN10
Voltage for FET drive
VNN+18
V
T
STORE
Storage Temperature Range
-40º to 150º
C
T
A
Operating Free-air Temperature Range (Note 2)
0º to 70º
C
T
J
Junction Temperature
150º
C
ESD
HB
ESD Susceptibility – Human Body Model (Note 3)
All pins
TBD
V
ESD
MM
ESD Susceptibility – Machine Model (Note 4)
All pins
TBD
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: This is a target specification. Characterization is still needed to validate this temperature range.
Note 3: Human body model, 100pF discharged through a 1.5K
Ω
resistor.
Note 4: Machine model, 220pF – 240pF discharged through all pins.
Operating Conditions
(Note 5)
SYMBOL
PARAMETER
MIN.
TYP. MAX. UNITS
VPP, VNN
Supply Voltage (Note 5)
+/-125
+/-148 +/- 185
V
V5
Positive 5 V Bias Supply
4.5
5
5.5
V
VN10
Voltage for FET drive (Volts above VNN)
10.8
12
13.2
V
Note 5: 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.
2
TA0105A – KL/ Rev. 0.90/08.02
Tripath Technology, Inc. - Technical Information
Electrical Characteristics
(Note 6)
T
A
= 25
°
C. See Application/Test Circuit on page 7. Unless otherwise noted, the supply voltage is
VPP=|VNN|=148V. See Note 9.
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNITS
I
q
Quiescent Current
(No load, BBM0=1,BBM1=0,
Mute = 0V)
VPP = +148V
VNN = -148V
V5 = 5V
VN10 = 12V
35
40
45
120
100
100
80
250
mA
mA
mA
mA
I
q
Quiescent Current
(No load, BBM0=1,BBM1=0,
Mute = 0V)
VPP = +106V
VNN = -106V
V5 = 5V
VN10 = 12V
30
35
45
130
100
100
80
250
mA
mA
mA
mA
I
MUTE
Mute Supply Current
(No load, Mute = 5V)
VPP = +148V
VNN = -148V
V5 = 5V
VN10 = 12V
1
1
20
1
mA
mA
mA
mA
TBD
I
Po
Power Supply Current
(Vo = 100Vrms, R
L
= 50
Ω
)
VPP = +148V (Both Channels On)
VNN = -148V (Both Channels On)
1.7
1.7
A
A
I
Po
Power Supply Current
(Vo = 70.7Vrms, R
L
= 25
Ω
)
VPP = +106 (Both Channels On)
VNN = -106 (Both Channels On)
2.5
2.5
A
A
V
IH
High-level input voltage (MUTE)
3.5
V
V
IL
Low-level input voltage (MUTE)
1.0
V
V
OH
High-level output voltage (HMUTE) RL = 10kohm
3.5
V
V
OL
Low-level output voltage (HMUTE) RL = 10kohm
0.5
V
V
OFFSET
Output Offset Voltage
No Load, MUTE = Logic low
-2.5
2.5
V
I
OC
Over Current Sense Voltage
Threshold
TBD
TBD
1.0
TBD
V
V
VPPSENSE
VPPThreshold Voltages
Over-voltage turn on (muted)
Over-voltage restart (mute off)
Under-voltage restart (mute off)
Under-voltage turn on (muted)
193
185
80
227
216
111
101
250
125
118
V
V
V
V
V
VNNSENSE
VNN Threshold Voltages
Over-voltage turn on (muted)
Over-voltage restart (mute off)
Under-voltage restart (mute off)
Under-voltage turn on (muted)
-193
-185
-80
-221
-215
-110
-98
-250
-125
-118
V
V
V
V
V
VPPSENSE
VPPThreshold Voltages
(Externally shifted)
(Note 7)
Over-voltage turn on (muted)
Over-voltage restart (mute off)
Under-voltage restart (mute off)
Under-voltage turn on (muted)
147
140
60
167
159
82
74
185
95
85
V
V
V
V
V
VNNSENSE
VNN Threshold Voltages
(Externally shifted)
(Note 7)
Over-voltage turn on (muted)
Over-voltage restart (mute off)
Under-voltage restart (mute off)
Under-voltage turn on (muted)
-147
-140
-60
-166
-161
-82
-73
-185
-95
-85
V
V
V
V
Note 6:
Minimum and maximum limits are guaranteed but may not be 100% tested.
Note 7: These voltage values are calculated and not 100% tested. The voltages are based on 100% tested sense
currents, an external “shift” resistor of 3.83M
Ω
from VLOW to VNN and another 3.83M
Ω
resistor from VHIGH to
VPP, and the on board sense resistor values of 1.27M
Ω
for VNN, and 1.4M
Ω
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 – KL/ Rev. 0.90/08.02
Tripath Technology, Inc. - Technical Information
Performance Characteristics – Single Ended
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.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP. MAX. UNITS
P
OUT
Output Power
(Continuous Output/Channel)
THD+N = 0.1%, R
L
= 25
Ω
R
L
= 12.5
Ω
THD+N = 1%, R
L
= 25
Ω
TBD
TBD
TBD
TBD
W
W
W
W
R
L
= 12.5
Ω
THD + N Total Harmonic Distortion Plus
Noise
V
OUT
= 50.0Vrms, f = 1kHz, R
L
=
12.5
Ω
, VPP=|VNN|=106V
TBD
0.25
%
THD + N Total Harmonic Distortion Plus
Noise
V
OUT
= 70.7Vrms, f = 7kHz, R
L
=
12.5
Ω
, VPP=|VNN|=106V
TBD
1.0
%
THD + N Total Harmonic Distortion Plus
Noise
V
OUT
= 70.7Vrms, f = 1kHz, R
L
=
25.0
Ω
, VPP=|VNN|=148V
TBD
0.25
%
THD + N Total Harmonic Distortion Plus
Noise
V
OUT
= 70.7Vrms, f = 7kHz, R
L
=
25.0
Ω
, VPP=|VNN|=148V
TBD
1.0
%
IHF-IM
IHF Intermodulation Distortion
19kHz, 20kHz, 1:1 (IHF), R
L
= 25
Ω
P
OUT
= TBDW/Channel
TBD
%
SNR
Signal-to-Noise Ratio
A Weighted, R
L
= 12.5
Ω
,
P
OUT
= TBDW/Channel
TBD
dB
CS
Channel Separation
0dBr = TBDW, R
L
= 25
Ω
, f = 1kHz
TBD
dB
η
Power Efficiency
V
OUT
= 100Vrms/Channel, R
L
= 50
Ω
80
%
η
Power Efficiency
V
OUT
= 70.7Vrms/Channel, R
L
= 25
Ω
75
%
A
V
Amplifier Gain
P
OUT
= 10W/Channel, R
L
= 25
Ω
, Rin
= 34.8k
Ω
, See Application / Test
Circuit
40.5
V/V
A
VERROR
Channel to Channel Gain Error
P
OUT
= 10W/Channel, R
L
= 25
Ω
See Application / Test Circuit
-1
1
dB
e
NOUT
Output Noise Voltage
A-Weighted, input shorted, DC offset
nulled to zero
700
µ
V
Note 8:
Minimum and maximum limits are guaranteed but may not be 100% tested.
Note 9: 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 – KL/ Rev. 0.90/08.02
Tripath Technology, Inc. - Technical Information
TA0105A Pinout
38
37
36
35
34
33
32
31
30
29
28
1
AGND
LO2
27
2
OVERLOADB
HO2COM
26
3
V5
HO2
25
4
MUTE
VNN
24
5
IN2
VPP
23
6
IN1
HO1
22
7
BBM0
H01COM
21
8
BBM1
LO1
20
9
10
11
12
13
14
15
16
17
18
19
5
TA0105A – KL/ Rev. 0.90/08.02
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