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TPA2100P1YZHT Datasheet(PDF) 9 Page - Texas Instruments

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No. de Pieza. TPA2100P1YZHT
Descripción  19-VPP Mono Class-D Audio Amplifier for Piezo/Ceramic Speakers
Descarga  23 Pages
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Fabricante  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPA2100P1YZHT Datasheet(HTML) 9 Page - Texas Instruments

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APPLICATION INFORMATION
FULLY DIFFERENTIAL CLASS-D AUDIO POWER AMPLIFIER
DRIVING A CERAMIC/PIEZO SPEAKER
LOAD CONFIGURATION
TPA2100P1
www.ti.com ........................................................................................................................................................................................... SLOS595 – DECEMBER 2008
The TPA2100P1 consists of a boost converter and a Class-D amplifier. The boost converter takes a low supply
voltage, VDD, and increases it to a higher output voltage, VCCOUT. VCCIN is the power supply for the Class-D
amplifier. Connect VCCOUT to VCCIN.
The TPA2100P1 is a fully differential amplifier. The fully differential amplifier includes a differential amplifier with
common-mode feedback. The differential output is equal to the differential input times the gain. The
common-mode feedback ensures that the common-mode voltage at the output is biased around VCC/2 (Class-D
supply voltage, VCCOUT, divided by 2) regardless of the common-mode voltage at the input. The fully differential
TPA2100P1 can still be used with a single-ended input; however, the TPA2100P1 should be used with
differential inputs when in a noisy environment, like a wireless handset, to ensure maximum noise rejection.
• Input-coupling capacitors are not required:
The TPA2100P1 inputs can be biased anywhere within the common mode input voltage range listed in the
Recommended Operating Conditions table. If the inputs are biased outside of that range, then
input-coupling capacitors are required.
• Mid-supply bypass capacitor, C
BYPASS, is not required:
The fully differential amplifier does not require a bypass capacitor. Any shift in the midsupply affects both
positive and negative channels equally and cancels at the differential output.
• Excellent RF-immunity and supply noise rejection:
GSM handsets save power by turning on and off the RF transmitter at 217 Hz. The transmitted signal is
picked-up on input, output, and power supply traces. The fully differential amplifier cancels the signal
better than a typical audio amplifier.
Applications that require thin cases, such as mobile phones, demand that external components have a small
form factor. Dynamic loudspeakers that use a cone and voice coil typically cannot conform to the height
requirements. The option for these applications is to use a ceramic/piezoelectric loudspeaker.
Ceramic speakers have a capacitive behavior unlike a conventional loudspeaker, which has an inductive
behavior. Typical capacitance values for ceramic/piezo speakers are as high as 2
µF. High peak-to-peak voltage
drive is required to achieve acceptable sound pressure levels. Ceramic/piezo speakers have low current
consumption at frequencies up to 8 kHz. The impedance of the ceramic/piezo speaker decreases with increasing
audio frequency, thus requiring higher current as the frequency increases. However, audio signals in this range
are higher harmonics of lower fundamentals, so the current demand is still small when compared to dynamic
speaker current consumption.
Due to these characteristics, ceramic/piezo speakers are efficient in converting electrical audio signals into sound
pressure in the mid and high audio bands (starting at 900 Hz).
The TPA2100P1 overcomes the challenges of driving a ceramic/piezo speaker. The TPA2100P1 drives the
ceramic/piezo speaker with a constant output voltage over the battery life and across the audio frequency range.
The TPA2100P1 can be configured in several different ways to drive a ceramic/piezo speaker. The most obvious
configuration is to place a resistor on each output of the Class-D amplifier. A more efficient configuration is to
replace one resistor with an inductor at one of the outputs. A third way to configure is to place just one resistor
between the output and the speaker and connect the other output directly to the speaker.
For proper configuration of the load, it is important to observe the following variables:
• Speaker capacitance – C
SPK
• Maximum available current from the Boost converter – I
BOOSTMAX
• Highest desired audio frequency – f
AUDMAX
• Maximum voltage allowed across the speaker – V
OUTPEAK
• Peak Output Current from the Class-D Amplifier – I
CLASSDPEAK
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): TPA2100P1


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