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EB-TK2050 CLASS-T DIGITAL AUDIO AMPLIFIER 2 CHANNEL TK2050 EVALUATION BOARD
Technical Information - Board Rev. 2.1 Revision 1.0 - September 2002
GENERAL DESCRIPTION The EB-TK2050 Revision 2.1 is a stereo 50W per channel audio amplifier designed to provide a simple and straightforward environment for the evaluation of the TK2050 amplifier. For additional documentation on the TK2050, see the TK2050 Data Sheet. APPLICATIONS FEATURES
6 and 8 stereo 4 mono (parallel operation) Home Theater Receivers Multi-channel Distribution Powered DVD Systems Mini/Micro Systems
BENEFITS
More power per cubic inch for 50W/Channel design Simplifies thermal management Signal Quality comparable to high quality, linear amplifiers Simple building block for multi-channel design
Low Noise Floor: <135uV A-weighted Low Distortion: .005% THD+N, 20W, 6 .005% THD+N, 30W, 8 High Efficiency: 85% @ 46W, 6 89% @ 59W, 8 Over-Current Protection Over and Under Voltage Protection Over Temperature Protection
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EB-TK2050 - KL/Rev. 1.0/04.02
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
THD+N vs. OUTPUT POWER (per channel)
10 10
THD+N vs. OUTPUT POWER (per channel)
1
f=1kHz RL=6 VCC=23.5V AES17 Filter
%
1
f=1kHz RL=8 VCC=30V AES17 Filter
%
0.1
0.1
0.01
0.01
0.001 1 2 5 10 W 20 50 100
0.001 1 2 5 10 W 20 50 100
THD+N vs OUTPUT POWER (parallel operation)
10
90
EFFICIENCY vs OUTPUT POWER (parallel operation) 80 70 EFFICIENCY (%) 60 50 40 30 20 10
1
f=1kHz RL=4 VCC=30V AES17 Filter
f=1kHz RL=4 VCC=30V
%
0.1
0.01
0.001 1 2 5 10 W 20 50 100 200
0 0 10 20 30 40 50 60 70 80 90 100 110 120 OUTPUT POWER (W)
EFFICIENCY vs OUTPUT POWER (per channel)
EFFICIENCY vs OUTPUT POWER (per channel) 90 80 70 EFFICIENCY (%) 60 50 40 30 20 10 0 0 5 10 15 20 25 30 35 40 45 50 OUTPUT POWER (W)
90 80 70 EFFICIENCY (%)
f=1kHz RL=6 VCC=23.5V
60 50 40 30 20 10 0 0 5 10 15 20 25 30 35 40
F=1kHz RL=8 VCC=30V
45
50
55
60
OUTPUT POWER (W)
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EB-TK2050 - KL/Rev. 1.0/04.02
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OPERATING INSTRUCTIONS
BOARD CONNECTION DIAGRAM
GND VCC
VCC
V5
+
G5 V5
-
VCC FAULT TH_WAR V5 HMUTE
OUT1OUT1+
+
Speaker 1 OUT2OUT2+ GND
IN1
~
POWER SUPPLIES
MUTE
IN2
R24
G5
+
Speaker 2
Two external power supplies are required to operate the EB-TK2050: VCC (referenced to GND), and V5 (referenced to G5). The V5 ground (G5) must be kept separate from the VCC ground (GND). GND and G5 are joined at a common point on the EB-TK2050 with a 0 resistor (R1). The Minimum and Maximum VCC supply voltages are +10V and +30V, respectively. The V5 supply voltage is 5V. Please see the TK2050 Data Sheet for Minimum and Maximum values. The VCC and V5 power supply connections are standard female banana plug connectors. Please refer to the Board Connection Diagram for the connector locations on the EB-TK2050. OUTPUTS The output connections for each channel of the EB-TK2050 are made with standard female banana plug connectors. The output of the TK2050 is differential; therefore each output has a positive output (OUT1+ and OUT2+) and a NEGATIVE OUTPUT (OUT1- AND OUT2-). Please refer to the Board Connection Diagram for the connector locations on the EB-TK2050. INPUTS The input connection for each channel of the EB-TK2050 is made using two RCA connectors (female). The RCA connectors are labeled IN1 and IN2. These inputs share a common ground referenced to G5. Please refer to the Board Connection Diagram for the connector locations on the EB-TK2050. MUTE CONTROL JUMPER There is a 2-pin header located near the inputs that provides external control of the MUTE function. With a jumper loaded in this location, MUTE is pulled to G5 and the amplifer is in normal operation. When the jumper is removed, the MUTE line is pulled to V5 and the amplifier is muted. Please refer to the Board Connection Diagram for the connector locations on the EB-TK2050.
3
EB-TK2050 - KL/Rev. 1.0/04.02
-
~
R16
-
+
TC2000
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INDICATOR LED'S The EB-TK2050 has five condition indicator LED's: * VCC glows green when VCC is within operational limits. * FAULT glows red when the amplifier has detected a short circuit on the outputs or when the overtemperature circuitry has disabled the amplifier. * TH-WAR is an early warning temperature indicator which glows red when the TP2050 die reaches an internal temperature of 130oC. * V5 glows green when V5 is within operational limits. * HMUTE glows red when a fault occurs or the MUTE header is installed. Please refer to the TK2050 Data Sheet for a complete description of HMUTE. Please refer to the Board Connection Diagram for the LED locations on the EB-TK2050. OUTPUT OFFSET NULL There are two multi-turn potentiometers, R16 (Channel 1) and R24 (Channel 2), that are used to manually trim the output offset to 0Vdc. Please refer to the Board Connection Diagram for the potentiometer locations on the EB-TK2050. The Evaluation board is shipped with the offset nulled to within +/-10mV at 30V VCC. GAIN SETTING The gain of the EB-TK2050 Rev 1.3 is set to 15V/V. The gain of the TK2050 is the product of the TC2000 (control stage) gain and the TP2050 (power stage) gain. The control stage gain is set to unity. Before changing the gain of the EB-TK2050, please refer to the Amplifier Gain section of the EB-TK2050 Data Sheet. Performing Measurements on the EB-TK2050 Rev 2.1: The TK2050 operates by generating a high frequency switching signal based on the audio input. This signal is sent through a low-pass filter that recovers an amplified version of the audio input. The frequency of the switching pattern is spread spectrum in nature and typically varies between 100kHz and 1MHz, which is well above the 20Hz - 20kHz audio band. The pattern itself does not alter or distort the audio input signal, but it does introduce some inaudible components. The measurements of certain performance parameters, particularly noise related specifications such as THD+N, are significantly affected by the design of the low-pass filter used on the output as well as the bandwidth setting of the measurement instrument used. Unless the filter has a very sharp roll-off just beyond the audio band or the bandwidth of the measurement instrument is limited, some of the inaudible noise components introduced by the TK2050 amplifier switching pattern will degrade the measurement by including out of band (audio) energy. One feature of the TK2050 is that it does not require large multi-pole filters to achieve excellent performance in listening tests, usually a more critical factor than performance measurements. Though using a multi-pole filter may remove high-frequency noise and improve THD+N type measurements (when they are made with wide-bandwidth measuring equipment), these same filters degrade frequency response. The EB-TK2050 has a simple two-pole output filter with excellent performance in listening tests. (See Application Note 4 for additional information on bench testing)
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EB-TK2050 - KL/Rev. 1.0/04.02
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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
5
EB-TK2050 - KL/Rev. 1.0/04.02
1
J27 1 3/4"STANDOFF J28 1 3/4"STANDOFF J29 1 3/4"STANDOFF J30 1 3/4"STANDOFF
B1 FBP1 Y1 Y1B FBN1 FBP2 Y2 Y2B FBN2
B2 OUT1A IN1A IN1B OUT1B OUT2A IN2A IN2B OUT2B
TC2000
TP2050 R1
A
A
0
Title Size A Date:
TK2050 EVAL BOARD Document Number Monday, May 20, 2002 Sheet 1 of 4 Rev 2.1
1
1
V5 V5 J1 J147-ND C1 .1u;50V R8 750 C4 .1u;50V C5 .1u;50V V5 V5 V5 14K;1% FDBKN1 R7 C6 100u;16V;P5529-ND VCC 8.2K R53 11K U3 R5 REF OCD1 VLO 15 16 17 18 VHI V5 R54 22K GND V5 VP1 V5 V5 1 J16 1 2 CON2 2 V5 IN1 MUTE BBM1 BBM0 VP2 IN2 R2 470K 19 20 21 22 23 24 25 26 27 28 REF OCD1 VLO OVRLDB VHI GND V5 VP1 IN1 MUTE BBM1 BBM0 VP2 IN2 TC2000 OCD2 NC Y2 Y2B Y1B Y1 HMUTE FDBKN1 FDBKP1 VPWR FDBKN2 DCMP FDBKP2 BIASCAP 14 13 12 11 10 9 8 7 6 5 4 3 2 1 FDBKN2 DCMP FDBKP2 V2BG .1u;50V C7 R33 2K C38, C39, C40, and C41 must be very close to U3. 1 Y2 Y2B Y1B Y1 HMUTE FDBKN1 FDBKP1 2 D2 LED;RED;67-1342-1-ND R14 1.0K;1% C39 470p;50V FDBKP1 R12 14K;1% Y2 Y2B Y1B Y1 OCD2 1.0K;1% C38 470p;50V R3
V5
VSUP
FBP1
+
2 D1
LED;GREEN;67-1343-1-ND
POWER ON
R52 NS J147-ND J2
1
GND
FBN1
R16 5K;3296W-502-ND
A
3
Mouser#161-0390 J9 C8 2.2u;10V;PCS2225CT-ND 1 R18 470K
A
C2 .1u;50V FDBKN2 IN1 VP1 R23 20K R19 14K;1% R22 1.0K;1% C40 390p;50V FBP2
1
+
R21 20K
SCOPE_GND
J11
IN1
2
2
V5 1
R3, R7, R12, R14, R19, R22, R27, and R30 must be close to U3. 2 Nets "IN1" and "IN2" must be very short. FDBKP2 R30 R27 14K;1%
R24 5K;3296W-502-ND
R4 470K
3
FBN2
Mouser#161-0390 J10 C9 2.2u;10V;PCS2225CT-ND 1 R26 470K
C3 .1u;50V IN2 VP2
1.0K;1%
C41 390p;50V
1
+
R29 20K
IN2
2
R31 20K 2
Title
TK2050 EVAL BOARD
Size B Date: Document Number Monday, May 20, 2002 Sheet 2 of 4 Rev
2.1
1
1
V5 S2 S1 U2 R35 0 4-40_SCREW H1 4-40_SCREW C12 .1u;50V R37 10K HEATSINK R40 10K C18 .1u;50V FAULT 27 26 J12 HEATSINK_MOUNTING_HOLE 1 J18 HEATSINK_MOUNTING_HOLE 1 C21 .1u;50V TH_WAR IN1B IN1B 28 30 VCC1B OUT1B M4 18 NC VCC IBIAS IN2A VDD V5 2 R45 10K 1 TH_WAR V5 2 VDD VSS 1 FAULT C30 .1u;50V C31 .1u;50V VSS 31 21 22 33 34 VCC2A OUT2A VDD VDD VSS VSS REGULATORS M15 GND2A OUT2A 7 8 OUT2A 9 6 C24 .1u;50V C26 NS;0805 C28 .22u;100V;P4729-ND C29 1000p;50V OUT1B OUT2A L3 15u J7 J147-ND C25 .22u;50V;P4667-ND OUT1B GND1B 12 11 OUT1B 10 13 L2 15u C22 .1u;50V C23 .22u;50V;P4667-ND PROTECTION & LOGIC C15 .22u;100V;P4729-ND C16 1000p;50V IN1A IN1A IBIAS CONFIG PWRDN 29 23 24 25 IN1A IBIAS OUT1A CONFIG PWRDN M2 GND1A M3 VCC1A OUT1A 15 17 OUT1A 16 14 C10 .1u;50V C13 NS;0805 L1 15u OUT1P C11 .22u;50V;P4667-ND J5 J147-ND VCC OUT1A
OUT1+
C17 .1u;100V;P4725-ND R42 C20 1000p;50V
FAULT TRISTATE
VCC
R43 NS;1/4W
15;1W
TH_WAR IN1B
M5
OUT1OUT1N J6 J147-ND
IN2A
IN2A
M17
OUT2P
A
A
OUT2+
C32 .1u;100V;P4725-ND R50 15;1W C34 1000p;50V
Q4 BSS84CT-ND 3 3 R47 750
Q5 BSS84CT-ND R48 750
VCCSIGN VCCSIGN
35 36 20 32 19 1
VCCSIGN VCCSIGN GNDREG IN2B GNDCLEAN GNDSUB TP2050 OUT2B M14 M16 VCC2B OUT2B OUT2B GND2B 4 3 OUT2B 2 5 L4 15u C35 .1u;50V C36 .22u;50V;P4667-ND VCC R51 NS;1/4W
C14 .1u;50V
GNDREG IN2B GNDCLEAN GNDSUB
D4 LED;RED;67-1342-1-ND 1 1
D5 LED;RED;67-1342-1-ND
IN2B
OUT2OUT2N J8 J147-ND
2
2
VCC
SCOPE_GND
J25 2
R6 6.2K VCC
VCC J147-ND J4
D3 LED;GREEN;67-1343-1-ND 1 C37 560u;50V;P10329-ND
+
Title TK2050 EVAL BOARD J3 J147-ND Size B Date: Document Number Tuesday, May 21, 2002 Sheet 3 of 4 Rev 2.1
1
TK2050 EVAL BOARD Revised: Monday, May 20, 2002 Revision: 2.1 Part numbers ending with "-ND" are Digikey.com part numbers.
Bill Of Materials July 1,2002 10:08:44 Page1 Item Quantity Reference Part PCB Footprint comments ______________________________________________________________________________________________ 1 16 C1,C2,C3,C4,C5,C7,C10, C12,C14,C18,C21,C22,C24, C30,C31,C35 1 C6 2 C8,C9 4 C11,C23,C25,C36 2 C15,C28 4 C16,C20,C29,C34 2 C32,C17 1 C37 2 C39,C38 2 C41,C40 1 H1 4 L1,L2,L3,L4 4 R2,R4,R18,R26 4 R3,R12,R19,R27 1 R5 4 R7,R14,R22,R30 2 R24,R16 4 R21,R23,R29,R31 3 R37,R40,R45 2 R50,R42 1 R53 1 R54 2 S1,S2 1 U2 1 U3 .1u;50V CAP0805
2 3 4 6 7 8 9 10 11 14 21 24 25 26 28 30 31 33 34 37 38 39 40 41
100u;16V;P5529-ND 2.2u;10V;PCS2225CT-ND .22u;50V;P4667-ND .22u;100V;P4729-ND 1000p;50V .1u;100V;P4725-ND 560u;50V;P10329-ND 470p;50V 390p;50V HEATSINK 15u 470K 14K;1% 8.2K 1.0K;1% 5K;3296W-502-ND 20K 10K 15;1W 11K 22K 4-40_SCREW TP2050 TC2000
cape\100\200 CAP3216 CAP200F CAP7.5\10X4 CAP0805 CAP200W CAPE\300\700 CAP0805 CAP0805 INDMULT RES0805 RES0805 RES0805 RES0805 vres_190x390 RES0805 RES0805 R1/4WA RES0805 RES0805 SO36PWR SO28
use metallized film capacitor use metallized film capacitor use metallized film capacitor low ESR switching grade capacitor
IERC P002B Ewing Foley, inc - Jennifer Giovanetti - (408) 942-2403 AW600-06-48T-24-V - American Cores - Julie Yuan - (714)850-4660 must be 1% must be 1%
must be at least 1W
mounting screws for heatsink
These parts are optional: 5 2 C26,C13 12 2 D3,D1 13 3 D2,D4,D5 15 8 J1,J2,J3,J4,J5,J6,J7,J8 16 2 J9,J10 17 2 J25,J11 18 2 J12,J18 19 1 J16 20 4 J27,J28,J29,J30 22 2 Q4,Q5 23 2 R35,R1 27 1 R6 29 3 R8,R47,R48 32 1 R33 35 2 R43,R51 36 1 R52
NS;0805 LED;GREEN;67-1343-1-ND LED;RED;67-1342-1-ND J147-ND Mouser#161-0390 5011K-ND HEATSINK_MOUNTING_HOLE CON2 3/4"STANDOFF BSS84CT-ND 0 6.2K 750 2K NS;1/4W NS
CAP0805 LEDSMT LEDSMT BANANA_PLT_A RCA sip-1p_loop STANDOFF_440G SIP-2P STANDOFF_440 SOT23_FC RES0805 RES0805 RES0805 RES0805 R1/4WA RES0805
do not stuff indicator LEDs indicator LEDs banana jacks for speaker outputs and power Mouser#161-0390; RCA jacks for line level input test points mounting holes for heatsinks MUTE jumper mounting holes transistors for driving LEDs can be shorted resistors for LEDs resistors for LEDs resistors for LEDs do not stuff do not stuff

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