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FEATURES
1
• 10-W/ch into an 4-Ω Load From a 17-V Supply
• 15-W/ch into an 8-Ω Load From a 28-V Supply
• Operates from 10 V to 30 V
• Efficient Class-D Operation
• Four Selectable, Fixed Gain Settings
• Internal Oscillator (No External Components
Required)
• Single Ended Analog Inputs
• Thermal and Short-Circuit Protection with
Auto Recovery Feature
• 20-pin DIP Package
Left Channel
Right Channel
10 V to 30 V
Shutdown
Mute Control
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
15-W STEREO CLASS-D AUDIO POWER AMPLIFIER
SIMPLIFIED APPLICATION CIRCUIT
1 F
m
1 F
m
1 F
m
Control
SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007
APPLICATIONS
• Televisions
DESCRIPTION
The TPA3122D2 is a 15-W (per channel) efficient,
Class-D audio power amplifier for driving stereo
single ended speakers or mono bridge tied load. The
TPA3122D2 can drive stereo speakers as low as 4Ω.
The efficiency of the TPA3122D2 eliminates the need
for an external heat sink when playing music.
The gain of the amplifier is controlled by two gain
select pins. The gain selections are 20, 26, 32, and
36 dB.
TPA3122D2
0.22 F
m
LIN
BSR
RIN
ROUT
0.68 F
PGNDR
PGNDL
0.68 F
LOUT
BYPASS
BSL
AGND
0.22 F
m
PVCCL
AVCC
PVCCR
VCLAMP
SD
1 F
m
MUTE
GAIN0
GAIN1
TPA3122D2
22 H
470 F
m
m
m
m
22 H
470 F
m
m
10 V to 30 V
}
4-Step Gain
Control
Copyright © 2007, Texas Instruments Incorporated
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Related Manuals for Texas Instruments TPA3122D2
Summary of Contents for Texas Instruments TPA3122D2
- Page 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date.
-
Page 2: Terminal Functions
Reference for pre-amplifier inputs. Nominally equal to AVCC/8. Also controls start-up time via BYPASS external capacitor sizing. AVCC 16, 17 High-voltage analog power supply. Not internally connected to PVCCR or PVCCL Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2... -
Page 3: Absolute Maximum Ratings
Low-level input current MUTE, V = 0 V, V = 30 V GAIN0, GAIN1, V = 0 V, V = 24 V °C Operating free-air temperature –40 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2... - Page 4 10 V ≤ V mute delay time from mute input switches high until outputs muted msec Δt unmute delay time from mute input switches low until outputs unmuted msec Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2...
-
Page 5: Functional Block Diagram
AVDD AVDD PGNDL DETECT AVDD/2 AGND CONTROL BIAS VCLAMP THERMAL MUTE MUTE CONTROL OSC/RAMP BYPASS BYPASS GAIN1 CONTROL GAIN0 DETECT PVCCR ROUT VCLAMP PGNDR AVDD AVDD AVDD/2 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2... -
Page 6: Typical Characteristics
= 24 V = 24 V = 18 V 0.01 0.01 0.01 0.01 − Output Power − W − Output Power − W G005 G006 Figure 5. Figure 6. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2... - Page 7 THD+N = 1% THD+N = 1% − Supply Voltage − V − Supply Voltage − V G011 G012 Figure 12. NOTE: Dashed line = Thermally limited Figure 11. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2...
- Page 8 = 4 Ω (SE) −100 = 12 V = 200 mV ripple 0.001 −120 f − Frequency − Hz f − Frequency − Hz G018 G017 Figure 17. Figure 18. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2...
- Page 9 = 12 V −60 −80 = 24 V −100 −120 − Total Output Power − W f − Frequency − Hz G023 G024 Figure 23. Figure 24. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2...
- Page 10 TPA3122D2 may be used as a bridge tied load (BTL) amplifier. The traditional class-D modulation scheme, which is used in the TPA3122D2 BTL configuration, has a differential output where each output is 180 degrees out of phase and changes from ground to the supply voltage, V .
-
Page 11: Input Resistance
For design purposes, the input network (discussed in the next section) should be designed assuming an input impedance of 8 kΩ, which is the absolute minimum input impedance of the TPA3122D2. At the higher gain settings, the input impedance could increase as high as 72 kΩ... - Page 12 Single Ended (SE) 1500 Bridge Tied Load LOUT / ROUT filter LOUT filter filter filter ROUT filter filter Figure 26. BTL Filter Configuration Figure 27. SE Filter Configuration Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2...
-
Page 13: Shutdown Operation
MUTE Operation The MUTE pin is an input for controlling the output state of the TPA3122D2. A logic high on this terminal causes the outputs to run at a constant 50% duty cycle. A logic low on this pin enables the outputs. This terminal may be used as a quick disable/enable of outputs when changing channels on a television or switching between different audio sources. -
Page 14: Short Circuit Protection
PRINTED-CIRCUIT BOARD (PCB) LAYOUT Because the TPA3122D2 is a class-D amplifier that switches at a high frequency, the layout of the printed-circuit board (PCB) should be optimized according to the following guidelines for the best possible performance. - Page 15 This is because it takes an analog input signal and converts it into a pulse-width modulated (PWM) output signal that is not accurately processed by some analyzers. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2...
- Page 16 20 Hz - 20 kHz Generator (a) Basic Class-AB Power Supply filt Analyzer Signal Class-D APA filt 20 Hz - 20 kHz Generator (b) Traditional Class-D Figure 30. Audio Measurement Systems Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s) :TPA3122D2...
- Page 17 SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007 SE Input and SE Output (TPA3122D2 Stereo Configuration) The SE input and output configuration is used with class-AB amplifiers. A block diagram of a fully SE measurement circuit is shown in Figure 31.
- Page 18 SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007 DIFFERENTIAL INPUT AND BTL OUTPUT (TPA3122D2 Mono Configuration) Many of the class-D APAs and many class-AB APAs have differential inputs and bridge-tied load (BTL) outputs. Differential inputs have two input pins per channel and amplify the difference in voltage between the pins.
- Page 19 PACKAGE OPTION ADDENDUM www.ti.com 10-Apr-2008 PACKAGING INFORMATION Orderable Device Status Package Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Type Drawing TPA3122D2N ACTIVE PDIP Pb-Free CU NIPDAU N / A for Pkg Type (RoHS) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
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Page 21: Important Notice
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve 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 should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
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