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Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
TC2000 STEREO CLASS-TTM AUDIO CONTROLLER USING DIGITAL POWER PROCESSING (DPPTM) TECHNOLOGY
Technical Information Revision 1.1 - December 2003
GENERAL DESCRIPTION
The TC2000 is a two channel audio controller that uses Tripath's proprietary Digital Power Processing (DPPTM) technology. When combined with switching power output stages, the TC2000 allows the implementation of a complete Class-T audio amplifier. Class-T amplifiers offer both the audio fidelity of Class-AB and the power efficiency of Class-D amplifiers.
APPLICATIONS
FEATURES
5.1-Channel DVD Mini/Micro Component Systems Home Theater Stereo applications
BENEFITS
Class-T Architecture Audiophile Quality Sound 0.007% THD+N @ 30W 8 (with TP2050) High Efficiency 92% @ 60W 8 (with TP2050) Dynamic Range >100 dB
High fidelity, high efficiency Class-T Analog inputs
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A B S O L U T E M A X I M U M R A T I N G S (Note 1)
SYMBOL V5 Vlogic TA TSTORE TJMAX ESDHB 5V Power Supply Input Logic Level Operating Free-air Temperature Range Storage Temperature Range Maximum Junction Temperature ESD Susceptibility - Human Body Model (Note 2), all pins PARAMETER Value 6 V5+0.3V -40 to 85 -55 to 150 150 2000 UNITS V V C C C 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 1.5K resistor.
OPERATING CONDITIONS
SYMBOL V5 VHI VLO TA Supply Voltage Logic Input High Logic Input Low Operating Temperature Range -40 25 PARAMETER MIN. 4.5 V5-1.0 1 85 TYP. 5 MAX. 5.5 UNITS V V V C
THERMAL CHARACTERISTICS
TC2000
SYMBOL JA
PARAMETER Junction-to-ambient Thermal Resistance (still air)
Value 80
UNITS C/W
ELECTRICAL CHARACTERISTICS
SYMBOL I5 fsw VIN VOUTHI VOUTLO RIN Supply Current Switching Frequency (adjustable via CFB) Input Sensitivity High Output Voltage Low Output Voltage Input Impedance Input DC Bias 2 2.5 600 0 V5-0.5 100 PARAMETER MIN. TYP. 60 650 1.5 MAX. UNITS mA kHz V V mV k V
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TC2000 AUDIO SIGNAL PROCESSOR PIN DESCRIPTIONS
Pin 1 2, 6 3 4, 7 5 8 9, 12 10, 11 13 14,16 15 17 18 19 20 21 22, 27 23, 28 24 25, 26 Function BIASCAP FDBKP2, FDBKP1 DCMP FDBKN2, FDBKN1 VPWR HMUTE Y1, Y2 Y1B, Y2B NC OCD2, OCD1 REF VNNSENSE OVRLDB VPPSENSE AGND V5 OAOUT1, OAOUT2 INV1, INV2 MUTE BBM1, BBM0 Description Bandgap reference times two (typically 2.5VDC). Used to set the common mode voltage for the input op amps. This pin is not capable of driving external circuitry. Positive switching feedback. Internal mode selection. This pin must be grounded for proper device operation. Negative switching feedback. Test pin. Must be left floating. Logic output. A logic high indicates both amplifiers are muted, due to the mute pin state, or a "fault". Non-inverted switching modulator outputs. Inverted switching modulator outputs. No connect Over Current Detect. Ground if not used. Internal reference voltage; approximately 1.2 VDC. Negative power stage over/under supply voltage sense resistor tie point. A logic low output indicates the input signal has overloaded the amplifier. Positive power stage over/under supply voltage sense resistor tie point. Ground 5 Volt power supply input. Input stage output pins. Single-ended inputs. Inputs are a "virtual" ground of an inverting opamp with approximately 2.4VDC bias. When set to logic high, both amplifiers are muted and in idle mode. When low (grounded), both amplifiers are fully operational. If left floating, the device stays in the mute mode. Ground if not used. Break-before-make timing control.
TC2000 AUDIO SIGNAL PROCESSOR PINOUT
BIASCAP FDBKP2 DCMP FDBKN2 VPW R FDBKP1 FDBKN1 HMUTE Y1 Y1B Y2B Y2 NC OCD2
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
INV2 OAOUT2 BBM0 BBM1 MUTE INV1 OAOUT1 V5 AGND VPPSENSE OVRLDB VNNSENSE OCD1 REF
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APPLICATION / TEST DIAGRAM
Inputs and TC2000
R R EF 8.2K
15 16
R EF OCD0 VN N SEN SE O VR LD B VPPSEN SE AG N D
OCD1 NC Y2 Y2B Y1B Y1 H MU TE
14 13 12 11 10 9 8 Y2 Y2B Y1B Y1 H MU TE R FBC
R VN N SEN SE
V5
17 18 19 20
10k R O FA 500K R VPPSEN SE 20k
1 R O FB 5K
RCA J9
3
COF .1u;50V R O FA 500K CI 2.2u;10V RF 20K
V5
21 22 23
V5
FD BKN 1
7
O U T1A
O AO U T1 IN V1
TC 2000
R FBB
C FB
1 1
+
V5
RI 20K 1 R O FA 500K
JP
IN 1
2 2 1 R O FB 5K 2
R FBC FD BKP1 6
O U T1B
2
V5
24
MU TE
JU MPER
25 COF .1u;50V R O FA 500K RF 20K
R FBB BBM2
C FB
RCA J10
26
3
BBM1 5 4
27 28
1 1
O AO U T2 IN V2
VPW R FD BKN 2
R FBC
O U T2A
+
CI 2.2u;10V
IN 2
2 2
RI 20K
V5 V5
R FBB
C FB
+
CS .1u;50V CS 100u;16V D C MP 3 R FBC FD BKP2 BIASC AP 2 1 R FBB C7 .1u;50V C FB
O U T2B
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E X T E R N A L C O M P O N E N T S D E S C R I P T I O N (Refer to the Application/Test Circuit)
Component RI RF CI
Description Inverting input resistance to provide AC gain in conjunction with RF. This input is biased at the BIASCAP voltage (approximately 2.5VDC). Feedback resistor to set AC gain in conjunction with RI. Please refer to the Amplifier Gain paragraph, in the Application Information section. AC input coupling capacitor, which, in conjunction with RI, forms a high pass filter at fC = 1 (2RICI ) . Feedback divider resistor connected to AGND. The value of this resistor depends on the supply voltage setting and helps set gain in conjunction with RI, RF, RFBB, and RFBC. Please see the Modulator Feedback Design paragraphs in the Application Information Section. Feedback resistor connected from either the OUT1A/OUT2A to FDBKP1/FDBKP2 or OUT1B/OUT2B to FDBKN1/FDBKN2. The value of this resistor depends on the supply voltage setting and helps set gain in conjunction with RI, RF, RFBB, and RFBC. It should be noted that the resistor from OUT1/OUT2 to FBKOUT1/FBKOUT2 must have a power rating of greater than PDISS = VPP2 (2RFBC) . Please see the Modulator Feedback Design paragraphs in the Application Information Section. Feedback delay capacitor that both lowers the idle switching frequency and filters very high frequency noise from the feedback signal, which improves amplifier performance. The value of CFB should be offset between channel 1 and channel 2 so that the idle switching difference is greater than 40kHz. Please refer to the Application / Test Circuit. Potentiometer used to manually trim the DC offset on the speaker output. Resistor that limits the manual DC offset trim range and allows for more precise adjustment. Bias resistor. Locate close to pin 15 and ground at pin 20. Supply decoupling for the power supply pins. For optimum performance, these components should be located close to the TC2000 and returned to their respective ground as shown in the Application/Test Circuit. Resistor used to terminate the VNNSENSE pin to AGND. Resistor used to terminate the VPPSENSE pin to 5V.
RFBB
RFBC
CFB
ROFB ROFA RREF CS RVNNSENSE RVPPSENSE
APPLICATION INFORMATION TK2050 Basic Amplifier Operation
The TC2000 is a 5V CMOS signal processor that amplifies the audio input signal and converts the audio signal to a switching pattern. This switching pattern is spread spectrum with a typical idle switching frequency of about 650kHz externally set by the CFB. The switching patterns for the two channels are not synchronized and the idle switching frequencies should differ by at least 40kHz to avoid increasing the audio band noise floor. The idle frequency difference can be accomplished by offsetting the value of CFB for each channel. Typical values of CFB with the TP2050 are 470pF for channel 1 and 390pF for channel 2. Complementary copies of the switching pattern are output through the Y1 and Y1B pins and the Y2 and Y2B pins. These signals are used to drive the inputs of a MOSFET driver. In the generation of the patterns for the MOSFET driver the TC2000 inserts a "break-before-make" dead time between the
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turn-off of one transistor and the turn-on of the other in order to minimize shoot-through currents. For applications using the TP2050 please tie BBM0 and BBM1 to 5V for optimal operation.
Input Stage Design
The TC2000 input stage is configured as an inverting amplifier, allowing the system designer flexibility in setting the input stage gain and frequency response. Figure 1 shows a typical application where the input stage is a constant gain inverting amplifier. The input stage gain should be set so that the maximum input signal level will drive the input stage output to 4Vpp.
TC2000
OAOUT1 RF RI INV1 V5
CI INPUT1
+
BIASCAP
AGND V5
+ INV2 -
CI INPUT2
RF RI OAOUT2 AGND
Figure 1: Input Stage The gain of the input stage, above the low frequency high pass filter point, is that of a simple inverting amplifier: It should be noted that the input amplifiers are biased at approximately 2.5VDC. Thus, the polarity of CI must be followed as shown in Figure 1 for a standard ground referenced input signal
AV
INPUT STAGE
=-
RF RI
Input Capacitor Selection
CI can be calculated once a value for RI has been determined. CI and RI determine the input low frequency pole. Typically this pole is set below 10Hz. CI is calculated according to:
CI =
where:
1 2 f P R I
RI = Input resistor value in ohms. fP = Input low frequency pole (typically 10Hz or below)
Modulator Feedback Design
The modulator converts the signal from the input stage to the high-voltage output signal. The optimum gain of the modulator is determined from the maximum allowable feedback level for the modulator and maximum supply voltage for the power stage. Depending on the maximum supply voltage, the feedback ratio will need to be adjusted to maximize performance. The values of RFBB and RFBC (see explanation below) define the gain of the modulator. Once these values are chosen, based on the maximum supply voltage, the gain of the modulator will be fixed even as the supply voltage fluctuates due to current draw.
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For the best signal-to-noise ratio and lowest distortion, the maximum differential modulator feedback voltage should be approximately 4Vpp. This will keep the gain of the modulator as low as possible and still allow headroom so that the feedback signal does not clip the modulator feedback stage.
The modulator feedback resistors are:
RFBB = User specified; typically1k
V CC R FBB R FBC = 2V
Mute Control
- R FBB
When a logic high signal is supplied to MUTE, both amplifier channels are muted (both high- and lowside transistors are turned off). When a logic level low is supplied to MUTE, both amplifiers are fully operational.
Output Voltage Offset
The TC2000 does not have internal compensation for DC offset. If offset is a consideration for the intended application, trimming of the input offset voltage will be required. Tripath has had success with both active and passive circuits for this purpose; please consult with the Tripath Applications team for further information.
HMUTE
The HMUTE pin is a 5V logic output that indicates various fault conditions within the device.
OVRLDB
The OVRLDB pin is a 5V logic output that is asserted just at the onset of clipping. When low, it indicates that the level of the input signal has overloaded the amplifier resulting in increased distortion at the output. The OVRLDB signal can be used to control a distortion indicator light or LED through a simple buffer circuit, as the OVRLDB cannot drive an LED directly. There is a 20K resistor on chip in series with the OVRLDB output.
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PACKAGE INFORMATION - TC2000
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Tripath and Digital Power Processing are trademarks of Tripath Technology Inc. Other trademarks referenced in this document are owned by their respective companies. Tripath Technology Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Tripath does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. TRIPATH'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN CONSENT OF THE PRESIDENT OF TRIPATH TECHNOLOGY INC. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in this labeling, can be reasonably expected to result in significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. For more information on Tripath products, visit our web site at: www.tripath.com
Contact Information
TRIPATH TECHNOLOGY, INC 2560 Orchard Parkway, San Jose, CA 95131 408.750.3000 - P 408.750.3001 - F For more Sales Information, please visit us @ www.tripath.com/cont_s.htm For more Technical Information, please visit us @ www.tripath.com/data.htm
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