Texas Instruments | TPA3100D2 Mono Amplifier Configuration (Rev. A) | Application notes | Texas Instruments TPA3100D2 Mono Amplifier Configuration (Rev. A) Application notes

Texas Instruments TPA3100D2 Mono Amplifier Configuration (Rev. A) Application notes
Application Report
SLOA121A – April 2006 – Revised April 2007
TPA3100D2 Mono Amplifier Configuration
Yang Boon Quek ........................................................................................ HPL Audio Power Amplifiers
ABSTRACT
This application report presents two methods of configuring the TPA3100D2 as a mono
amplifier.
1
2
Contents
Single-Channel Configuration ..................................................................... 1
Paralleled Outputs Configuration ................................................................. 3
List of Figures
1
2
3
4
5
6
Single-Channel Configuration .....................................................................
THD+N Versus Po (Gain = 36 dB, Frequency = 1 kHz, RL = 8 Ω)...........................
THD+N Versus Po (Gain = 36 dB, Frequency = 1 kHz, RL = 4 Ω)...........................
Paralleled Outputs Configuration .................................................................
THD+N Versus Po (Gain = 36 dB, Frequency = 1 kHz, RL = 8 Ω)...........................
THD+N Versus Po (Gain = 36 dB, Frequency = 1 kHz, RL = 4 Ω)...........................
2
3
3
4
4
5
List of Tables
1
1
Recommended Filter Component Values ....................................................... 4
Single-Channel Configuration
The TPA3100D2 can be configured as a mono amplifier by using only one channel. Besides using less
external components, the single channel can be used to operate above the rated 20-W output power.
1.1
Circuit Implementation
•
•
•
Power BOTH channels but leave LOUTN and LOUTP floating.
Remove the VCLAMPL capacitor. Do not tie VCLAMPL to VCLAMPR.
Remove BSLP and BSLN capacitors and leave LINP and LINN terminals floating.
SLOA121A – April 2006 – Revised April 2007
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1
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Fault Output
Shutdown
and Mute
Control
Single-Channel Configuration
33 mH
0.1 mF
8W
0.47 mF
0.1 mF
33 mH
10 V - 26 V
220 nF
220 nF
10 mF
1 mF
NC
BSRN
ROUTN
ROUTP
ROUTN
ROUTP
RINN
BSRP
MUTE
NC
SHUTDOWN
Differential
Analog
Inputs
FAULT
NC
AVCC
1 mF
NC
10 V - 26 V
1 mF
PVCCR
RINP
PVCCR
AGND
PGNDR
LINP
PGNDR
220 mF
1 mF
1 mF
LINN
VCLAMPR
TPA3100D2
VCLAMPL
NC
4-Step
Gain Control
GAIN0
PGNDL
GAIN1
PGNDL
10 V - 26 V
MSTR/SLV
PVCCL
NC
LOUTN
BSLN
LOUTP
BSLP
AGND
VBYP
VREG
ROSC
NC
NC
SYNC
LOUTN
PVCCL
LOUTP
Synchronize Multiple
Class-D Devices
NC
100 kW
10 nF
1 mF
Figure 1. Single-Channel Configuration
2
TPA3100D2 Mono Amplifier Configuration
SLOA121A – April 2006 – Revised April 2007
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Paralleled Outputs Configuration
1.2
Higher Output Power (Single Channel)
Higher output power is achieved as shown in Figure 2 and Figure 3.
THD+N - Total Harmonic Distortion + Noise - %
10
Max PO 12 V = 10 W
Max PO 18 V = 22 W
1
Max PO 24 V = 39 W
0.1
Gain = 36 dB,
f = 1 kHz,
RL = 8 W
0.01
0.01
0.1
1
10
PO - Output Power - W
100
Figure 2. THD+N Versus Po (Gain = 36 dB, Frequency = 1 kHz, RL = 8 Ω)
THD+N - Total Harmonic Distortion + Noise - %
10
Gain = 36 dB,
f = 1 kHz,
RL = 4 W
Max PO 12 V = 17 W
1
Max PO 18 V = 37 W
0.1
Max PO 24 V = 26 W
Thermal Limited
0.01
0.01
0.1
1
10
PO - Output Power - W
100
Figure 3. THD+N Versus Po (Gain = 36 dB, Frequency = 1 kHz, RL = 4 Ω)
2
Paralleled Outputs Configuration
Another configuration of the TPA3100D2 as a mono amplifier is to parallel the left and right output
channels. This can achieve significantly higher output power and better efficiency than the single-channel
configuration.
The biggest drawback of the paralleled outputs configuration is the required use of two additional
high-current-rated inductors.
SLOA121A – April 2006 – Revised April 2007
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Paralleled Outputs Configuration
2.1
Circuit Implementation
As both audio channels of the TPA3100D2 are designed to be operated independently, tying the outputs
together results in a large current draw, and the device short-circuit protection is activated. Thus, a
low-pass LC filter is placed between each output and the speaker as shown in Figure 4. Use the
recommended L and C values as discussed in the applications report Class-D LC Filters (SLOA119).
Cg
Positive
Differential
Input Signal
Rinp
Routp
Lbtl
Rinn
Routn
Lbtl
Cg
Cbtl
TPA3100D2
Negative
Differential
Input Signal
Cg
Linp
Loutp
Linn
Loutn
Lbtl
Lbtl
Cbtl
Cg
Figure 4. Paralleled Outputs Configuration
Note that the effective load resistance on each channel is equal to two times the speaker impedance.
Table 1. Recommended Filter Component Values
2.2
Rspeaker
Lbtl
Cbtl
Cg
4Ω
33 µH
0.47 µF
0.1 µF
8Ω
60 µH
0.22 µF
0.022 µF
Higher Output Power (Paralleled Outputs)
Higher output power can be achieved as shown in Figure 5 and Figure 6.
THD+N - Total Harmonic Distortion + Noise - %
10
Gain = 36 dB,
f = 1 kHz,
RL = 8 W
Max PO 12 V = 10 W
1
Max PO 18 V = 24 W
Max PO 24 V = 42 W
0.1
0.01
0.01
0.1
1
10
PO - Output Power - W
100
Figure 5. THD+N Versus Po (Gain = 36 dB, Frequency = 1 kHz, RL = 8 Ω)
4
TPA3100D2 Mono Amplifier Configuration
SLOA121A – April 2006 – Revised April 2007
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Paralleled Outputs Configuration
THD+N - Total Harmonic Distortion + Noise - %
10
Gain = 36 dB,
f = 1 kHz,
RL = 4 W
Max PO 12 V = 20 W
1
Max PO 18 V = 43 W
0.1
Max PO 24 V = 45 W
Thermal Limited
0.01
0.01
0.1
1
10
PO - Output Power - W
100
Figure 6. THD+N Versus Po (Gain = 36 dB, Frequency = 1 kHz, RL = 4 Ω)
The paralleled output configuration is most effective at Vcc=24 V and Rspeaker = 4 Ω. For any other Vcc
and Rspeaker, the paralleled output configuration provides only marginal increase in output power while
increasing the total cost and PCB board space.
SLOA121A – April 2006 – Revised April 2007
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TPA3100D2 Mono Amplifier Configuration
5
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