tda2075a Tripath Technology Inc., tda2075a Datasheet

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tda2075a

Manufacturer Part Number
tda2075a
Description
Stereo Class-t Digital Audio Amplifier Driver Using Digital Power Processingtm
Manufacturer
Tripath Technology Inc.
Datasheet
STEREO CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING
DIGITAL POWER PROCESSING
TDA2075A
G E N E R A L D E S C R I P T I O N
The TDA2075A is a two-channel, amplifier driver, that uses Tripath’s proprietary Digital Power Processing
(DPP
chipsets while providing exceptional audio performance for real world applications. Class-T amplifiers
offer both the audio fidelity of Class-AB and the power efficiency of Class-D amplifiers.
The TDA2075A is typically configured as a split-supply, single-ended, stereo amplifier. The TDA2075A
can also be configured single-supply, single-ended, stereo amplifier, via external component choice. For
applications that require bridged output drive, please refer to the TDA1400.
Applications
¾Powered DVD Players
¾Mini-Compo Systems
¾Audio/Video Amplifiers & Receivers
¾Multimedia Speakers
Benefits
¾Reduced system cost with smaller/less
¾Signal fidelity equal to high quality
¾High dynamic range compatible with digital
P r e l i m i n a r y I n f o r m a t i o n
expensive power supply and heat sink
Class-AB amplifiers
media such as CD and DVD
1
TM
) technology. The TDA2075A offers higher integration over previous Tripath amplifiers driver
T M
Features
¾Class-T architecture with proprietary DPP
¾“Audiophile” Sound Quality
¾Full Audio Bandwidth, 20Hz to 20kHz
¾High Efficiency
¾Supports wide range of output power levels
¾Compatible with unregulated power supplies
¾Output over-current protection
¾Over- and under-voltage protection
¾Over-temperature protection
¾48-Pin LQFP Package
TECHNOLOGY
T r i p a t h T e c h n o l o g y , I n c . - T e c h n i c a l I n f o r m a t i o n
and output loads by changing supply voltage
and external Mosfets
R e v i s i o n 0 . 9 – O c t o b e r 2 0 0 5
T D A 2 0 7 5 A – R e v . 0 . 9 / K L i / 1 0 . 0 5

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tda2075a Summary of contents

Page 1

... DIGITAL POWER PROCESSING The TDA2075A is a two-channel, amplifier driver, that uses Tripath’s proprietary Digital Power Processing TM (DPP ) technology. The TDA2075A offers higher integration over previous Tripath amplifiers driver chipsets while providing exceptional audio performance for real world applications ...

Page 2

... See Electrical Characteristics for guaranteed specific performance limits. Note 5: The supply limitation is based on the internal over-current detection circuit. This limitation is subject to additional characterization. In addition, depending on feedback configuration, the TDA2075A can be used in single-supply applications, in which case, the negative supply, VNN, is not needed. ...

Page 3

... Electrical Characteristics TDA2075A = 25 qC. See Application/Test Circuit on page 7. Unless otherwise noted, the supply voltages are T A V5=5V, V10=10V, and VPP=|VNN|=40V. SYMBOL PARAMETER I Quiescent Current 5Q (Mute = 0V) I Quiescent Current 10Q (Mute = 0V) I Quiescent Current VPPQ (Mute = 0V) I Quiescent Current VNNQ (Mute = 0V) ...

Page 4

Performance Characteristics = 25 qC. Unless otherwise noted, the supply voltages are V5 = 5V, V10 = 10V, and VPP = |VNN 40V, the input frequency is 1kHz and the measurement bandwidth is 20kHz. See Application/Test Circuit. ...

Page 5

... TDA2075A Pinout SEN SE OVR VPPSEN SE 41 AGN D 42 AGN OAOU ...

Page 6

Pin Description Pin Function 1 OAOUT2 2 INV2 3 BIASCAP 4 DCMP 5 AGND BBMSET 8 GATEOFF 9, 10 OCSP1, OCSN1 11 FBKGND1 12 FBKOUT1 13 PGND 15 HO1 17 L01 20 LO2 22 HO2 24 PGND ...

Page 7

... FBC 0: Analog Ground Power Ground * The values of these components must be adjusted based on supply voltage range. See Application Information. ** Refer to the RB-TDA2075A document for a detailed description of these optional circuits – VPP C S 220uF ...

Page 8

... The value of C minimize noise coupling between the channels. Please refer to the Application / Test Circuit. R Potentiometer used to manually trim the DC offset on the output of the TDA2075A. OFA R Resistor that limits the DC offset trim range and allows for precise adjustment. OFB C Capacitor that filters the manual DC offset trim voltage ...

Page 9

... Q N should be used. D Diode that keeps the gate capacitor biased at the proper voltage when the supply BIAS voltage decreases. C Gate capacitor that ac-couples the TDA2075A from the high voltage MOSFETs Bias resistors for the increasing supply circuits. ISA, ISB C Bias capacitor for the increasing supply circuits ...

Page 10

Typical Performance Characteristics THD+N versus Output Power VPP = |VNN| = 30V, 35V and 40V f = 1kHz BW = 22Hz - 20kHz(AES17 0.1 0.01 0.001 THD+N versus ...

Page 11

Typical Performance Characteristics Efficiency and Power Dissipation versus Output Power Efficiency Pow er Dissipation 30 20 VPP = |VNN| = 40V 1kHz BW = 22Hz - 20kHz(AES17) 0 ...

Page 12

... Figure 1: Simplified TDA2075A Amplifier TDA2075A Basic Amplifier Operation The audio input signal is fed to the processor internal to the TDA2075A, where a switching pattern is generated. The average idle (no input) switching frequency is approximately 700kHz. With an input signal, the pattern is spread spectrum and varies between approximately 200kHz and 1.5MHz depending on input signal level and frequency ...

Page 13

... To minimize noise pickup and minimize THD+ close to the TDA2075A 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 best to shield the high voltage feedback lines by using a ground plane around these traces as well as the input section ...

Page 14

... These precautions will both minimize audible noise and enhance the crosstalk performance of the TDA2075A possible to use a low impedance ground plane for PGND as well. But the ground plane must be contiguous or ground currents from each channel can create crosstalk issues ...

Page 15

... TDA2075A Amplifier Gain The gain of the TDA2075A is the product of the input stage gain and the modulator gain for the TDA2075A. Please refer to the sections, Input Stage Design, and Modulator Feedback Design, for a complete explanation of how to determine the external component values TDA2075A ...

Page 16

... The input to the modulator (FBKOUT1/FBKGND1 for channel 1) can be viewed as inputs to an inverting differential amplifier. R and R FBA FBB large OUT1/OUT2 signal to down to 4Vpp. 1/2 TDA2075A Processing & Modulation Figure 3: Modulator Feedback has been determined ...

Page 17

For SPLIT-SUPPLY operation: The modulator feedback resistors are: R User specified, FBA R * VPP FBA R FBB (VPP - VPP FBA R FBC FBC | MODULATOR R The above equations ...

Page 18

... Tripath recommends that all offsets be removed with the circuit shown in Figure 4. It should be noted that the DC voltage on the output of a muted TDA2075A with no load is approximately 2.5V. This offset does not need to be nulled. The output impedance of the amplifier in mute mode is approximately 10K: thus explaining why the DC voltage drops to essentially zero when a typical load is connected ...

Page 19

... VPPSENSE. The over- and under-voltage limits are determined by the values of the resistors in the networks, as described in the table “Test/Application Circuit Component Values”. If the supply voltage falls outside the upper and lower limits determined by the resistor networks, the TDA2075A shuts off the output stages of the amplifiers. The removal of the over-voltage or under-voltage condition returns the TDA2075A to normal operation ...

Page 20

... MIN_OV_TUR Output Transistor Selection The key parameters to consider when selecting what n-channel and p-channel MOSFETs to use with the TDA2075A are drain-source breakdown voltage (BVdss), gate charge (Qg), and on-resistance (R The BVdss rating of the MOSFET needs to be selected to accommodate the voltage swing between V and V as well as any voltage peaks caused by voltage ringing due to switching transients ...

Page 21

... The complementary half-bridge power MOSFETs require a deadtime between when one transistor is turned off and the other is turned on (break-before-make) in order to minimize shoot through currents. The TDA2075A has an analog input pin that controls the break-before-make timing of the output transistors. Connecting R from the BBMSET pin (pin 7) to analog ground creates a current that BBM defines the BBM setting by the following equation ...

Page 22

... This information can be used to eliminate boost by putting the two channels of a TDA2075A amplifier out of phase with each other. This works because each channel is pumping out of phase with the other, and the net effect is a cancellation of pumping currents in the power supply ...

Page 23

Package Information ...

Page 24

... 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 ...

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