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PDF TK2019 Data sheet ( Hoja de datos )
| Número de pieza | TK2019 | |
| Descripción | STEREO 20W (4OHM) CLASS-T DIGITAL AUDIO AMPLIFIER | |
| Fabricantes | Tripath | |
| Logotipo |  |
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Tripath Technology, Inc. - Technical Information
TK2019
STEREO 20W (4Ω) CLASS-T™ DIGITAL AUDIO AMPLIFIER
DRIVER USING DIGITAL POWER PROCESSING (DPP™)
TECHNOLOGY
Preliminary Information
Revision 2.1 – October 2003
GENERAL DESCRIPTION
The TK2019 (TC2001/TPS1035 chipset) is a stereo single ended 20W
continuous average power per channel, Class-T Digital Audio Power
Amplifier using Tripath’s proprietary Digital Power ProcessingTM technology.
The TK2019 chipset consists of 1 TC2001 and 2 TPS1035’s to obtain a
single ended stereo configuration. Class-T amplifiers offer both the audio
fidelity of Class-AB and the power efficiency of Class-D amplifiers.
APPLICATIONS
5.1-Channel powered DVD player
Mini/Micro Component Systems
Home Theater
Stereo applications (4Ω / 8Ω)
BENEFITS
Single Supply Operation
Very High Efficiency
Wide Dynamic Range
Compact layout
FEATURES
Class-T Architecture
High Output power
20W @ 4Ω, 10% THD+N Single Ended
11W @ 8Ω, 10% THD+N Single Ended
Audiophile Quality Sound
0.03% THD+N @ 11W 4Ω Single Ended
0.03% THD+N @ 6W 8Ω Single Ended
High Efficiency
92% @ 20W 4Ω Single Ended
93% @ 11W 8Ω Single Ended
Dynamic Range >100 dB
1 TK2019 – MC/2.1/10-03
1 page  
Tripath Technology, Inc. - Technical Information
TC2001 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
FBKGND2,
FBKGND1
DCMP
FBKOUT2,
FBKOUT1
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.
Ground Kelvin feedback (Channels 1 & 2)
Internal mode selection. This pin must be grounded for proper device
operation.
Switching feedback (Channels 1 & 2)
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 pins. These pins should be tied to ground.
Internal bandgap reference voltage; approximately 1.2 VDC.
Negative supply voltage sense input. This pin is used for both over and
under voltage sensing for the VNN supply. Not used on the TK2019.
Connect this pin to AGND through a 10kΩ resistor.
A logic low output indicates the input signal has overloaded the amplifier.
Positive supply voltage sense input. This pin is used for both over and
under voltage sensing for the VPP supply.
Analog 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 to prevent shoot-through in the output
MOSFETs. When using with the TPS1035, these pins should both be
set to 5V.
TC2001 AUDIO SIGNAL PROCESSOR PINOUT
28-pin SOIC
(Top View)
BIASCAP
FBKGND2
DCMP
FBKOUT2
VPW R
FBKGND1
FBKOUT1
HMUTE
Y1
Y1B
Y2B
Y2
NC
OCD2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 INV2
27 OAOUT2
26 BBM0
25 BBM1
24 MUTE
23 INV1
22 OAOUT1
21 V5
20 AGND
19 VPPSENSE
18 OVRLDB
17 VNNSENSE
16 OCD1
15 REF
5 TK2019 – MC/2.1/10-03
5 Page 
Tripath Technology, Inc. - Technical Information
APPLICATION INFORMATION
TK2019 Basic Amplifier Operation
The TC2001 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 700kHz. 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 are 390pF for channel 1 and 560pF for channel 2.
The TPS1035 is a MOSFET output stage that level-shifts the signal processor’s 5V switching patterns
to the power supply voltages and drives the power MOSFETs. The power MOSFETs are N-channel
devices configured in half-bridges and are used to supply power to the output load. The outputs of
the power MOSFETs must be low pass filtered to remove the high frequency switching pattern. A
residual voltage from the switching pattern will remain on the speaker outputs when the
recommended output LC filter is used, but this signal is outside of the audio band and will not affect
audio performance.
Circuit Board Layout
The TK2019 is a power (high current) amplifier that operates at relatively high switching frequencies.
The output of the amplifier switches between VDD and GND at high speeds while driving large
currents. This high-frequency digital signal is passed through an LC low-pass filter to recover the
amplified audio signal. Since the amplifier must drive the inductive LC output filter and speaker loads,
the amplifier outputs can be pulled above the supply voltage and below ground by the energy in the
output inductanor. To avoid subjecting the TK2019 to potentially damaging voltage stress, it is critical
to have a good printed circuit board layout. It is recommended that Tripath’s layout and application
circuit be used for all applications and only be deviated from after careful analysis of the effects of any
changes.
The following components are important to place near their associated TC2001/TPS1035 pins and
are ranked in order of layout importance, either for proper device operation or performance
considerations.
- The capacitors CHBR provide high frequency bypassing of the amplifier power supplies and
will serve to reduce spikes across the supply rails. CHBR should be kept within 1/8” (3mm)
of the VCC pins. Please note that the four VDD pins must be decoupled separately. In
addition, the voltage rating for CHBR should be 35V as this capacitor is exposed to the full
supply range.
- CFB removes very high frequency components from the amplifier feedback signals and
lowers the output switching frequency by delaying the feedback signals. In addition, the
value of CFB is different for channel 1 and channel 2 to keep the average switching
frequency difference greater than 40kHz. This minimizes in-band audio noise.
- To minimize noise pickup and minimize THD+N, RFBC should be located as close to the
TC2001 as possible. Make sure that the routing of the high voltage feedback lines is kept
far away from the input op amps or significant noise coupling may occur. It is best to shield
the high voltage feedback lines by using a ground plane around these traces as well as the
input section.
In general, to enable placement as close to the TC2001/TPS1035, and minimize PCB parasitics, the
capacitors listed above (with the exception of the bulk capacitors) should be surface mount types.
11 TK2019 – MC/2.1/10-03
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet TK2019.PDF ] | |
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