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TA0105A View Datasheet(PDF) - Tripath Technology Inc.

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TA0105A Datasheet PDF : 29 Pages
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Tripath Technology, Inc. - Technical Information
External Components Description (Refer to the Application/Test Circuit)
Components
RI
CI
RFB
CFB
ROFA
ROFB
COF
CS
RS
ROCR
CHBR
QO
DO
RG
DG
Description
Inverting input resistance to provide AC gain in conjunction with RF. This input is
biased at the BIASCAP voltage (approximately 2.5VDC).
AC input coupling capacitor which, in conjunction with RI, forms a highpass filter at
fC = 1 (2πRICI) .
Feedback resistor connected from either the half-bridge output to FDBKN1
(FDBKN2) or speaker ground to GNDKELVIN1 (GNDKELVIN2). The value of this
depends on the supply voltage range and sets the TA0105A gain in conjunction with
RI. It should be noted that the feedback resistor from the half-bridge output must
have a power rating of greater that PDISS = VPP2/2RFB. 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 output of the TA0105A.
Resistor that limits the manual DC offset trim range and allows for more precise
adjustment.
Decoupling capacitor which low pass filters the offset trim voltage from noise and
power supply fluctuations.
Supply decoupling for the power supply pins. For optimum performance, these
components should be located close to the TA0105A and returned to their
respective ground as shown in the Application/Test Circuit.
Over-current sense resistor. Please refer to the section, Setting the Over-current
Threshold, in the Application Information for a discussion of how to choose the value
of RS to obtain a specific current limit trip point.
Over-current “trim” resistor, which, in conjunction with RS, sets the current trip point.
Please refer to the section, Setting the Over-current Threshold, in the Application
Information for a discussion of how to calculate the value of ROCR.
Supply decoupling for the high current Half-bridge supply pins. These components
must be located as close to the output MOSFETs as possible to minimize output
ringing which causes power supply overshoot. By reducing overshoot, these
capacitors maximize both the TA0105A and output MOSFET reliability. These
capacitors should have good high frequency performance including low ESR and
low ESL. In addition, the capacitor rating must be twice the maximum VPP voltage.
Output MOSFET. This is the main output switching device and to a large extent,
sets the amplifier’s limitations. This device must be a switching grade device with a
good compromise between gate charge and on resistance while being able to
withstand the full supply range. Please refer to the recommended devices in the
Applications Information section.
Output diode, which is used to minimizes output overshoots/undershoots on the
output node. These devices clamp the output to low impedance node formed by the
close connection of CHBR. Note the connection shown in the Application/Test
Circuit. The “drain to drain” diode protects the bottom side device from excessive
BVDSS due to overshoots on the output node. The “source to source” diode
protects the top side device from excessive BVDSS due to undershoots on the
output node. This device must be an ultra fast rectifier capable of sustaining the
entire supply range (VPP-VNN) and high peak currents.
Gate resistor, which is used to control the MOSFET rise/ fall times. This resistor
serves to dampen the parasitics at the MOSFET gates, which, in turn, minimizes
ringing and output overshoots. The typical power rating is 1 watt.
Gate diode, which is used to “speed-up” the turn off of the MOSFET. This
minimizes cross conduction and idle VPP/VNN supply current. This device should
be a switching grade type such as Schottky or ultra-fast rectifier.
8
TA0105A – RW/ Rev. 2.2/05.05
 

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