TDA1400 Tripath Technology, TDA1400 Datasheet - Page 9

• Manufacturer Part Number: TDA1400
• Description: MONO CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER
• Manufacturer: Tripath Technology

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External Components Description
Components
R
R
C
R
R
R
C
R
R
C
R
R
C
C
R
R
R
R
9
I
F
I
FBA
FBB
FBC
FB
OFA
OFB
OF
REF
BBMSET
A
S
VNN1
VNN2
VPP1
VPP2
Description
Inverting input resistance to provide AC gain in conjunction with R
biased at the BIASCAP voltage (approximately 2.5VDC).
Feedback resistor to set AC gain in conjunction with R
Gain paragraph, in the Application Information section.
AC input coupling capacitor which, in conjunction with R
Feedback divider resistor connected to V5. This value of this resistor depends on
the supply voltage setting and helps set the TDA1400 gain in conjunction with R
R
Application Information Section.
Feedback divider resistor connected to AGND. This value of this resistor depends
on the supply voltage setting and helps set the TDA1400 gain in conjunction with R
R
Application Information Section.
Feedback resistor connected from either the OUTP to FBK_POS or OUTN to
FBK_NEG. The value of this resistor depends on the supply voltage setting and
helps set the TDA1400 gain in conjunction with R
noted that R
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 same value C
at FBK_POS and FBK_NEG. Please refer to the Application / Test Circuit.
Potentiometer used to manually trim the DC offset on the output of the TDA1400.
Resistor that limits the DC offset trim range and allows for precise adjustment.
Capacitor that filters the manual DC offset trim voltage.
Bias resistor. Locate close to pin 34 and ground to plane with a low impedance
connection to pins 41 and 42.
Bias current setting resistor for the BBM setting. Locate close to pin 7 and ground
directly to pin 5. See Application Information on how to determine the value for
R
BIASCAP decoupling capacitor. Locate close to pin 3 and ground to plane with a
low impedance connection to pins 41 and 42.
Supply decoupling capacitor for the power pins. For optimum performance, these
components should be located close to the TDA1400 and returned to their
respective ground as shown in the Application Circuit.
Main overvoltage and undervoltage sense resistor for the negative supply (VNN).
Please refer to the Electrical Characteristics Section for the trip points as well as the
hysteresis band. Also, please refer to the Over / Under-voltage Protection section in
the Application Information for a detailed discussion of the internal circuit operation
and external component selection. When using a single power supply, this circuit
can be defeated by connecting a 16KΩ resistor to AGND.
Secondary overvoltage and undervoltage sense resistor for the negative supply
(VNN). This resistor accounts for the internal V
resistor value should be three times that of R
voltage Protection section in the Application Information for a detailed discussion of
the internal circuit operation and external component selection. When using a single
power supply, omit R
Main overvoltage and undervoltage sense resistor for the positive supply (VPP).
Please refer to the Electrical Characteristics Section for the trip points as well as the
hysteresis band. Also, please refer to the Over / Under-voltage Protection section in
the Application Information for a detailed discussion of the internal circuit operation
and external component selection.
Secondary overvoltage and undervoltage sense resistor for the positive supply
f
C
FBA,
F,
BBM
=
R
1
.
FBA,
and R
2 (
π
R
and R
I
C
FBC
I
)
FBC
.
. Please see the Modulator Feedback Design paragraphs in the
FBC
must have a power rating of greater than
. Please see the Modulator Feedback Design paragraphs in the
VNN2
.
(Refer to the Application/Test Circuit)
FB
should be used for each side and located directly
T r i p a t h T e c h n o l o g y , I n c . - P r e l i m i n a r y I n f o r m a t i o n
VNN1
NNSENSE
. Please refer to the Over / Under-
I,
R
F,
R
I
. Please refer to the Amplifier
bias of 1.25V. Nominal
FBA,
I
, forms a high-pass filter at
P
DISS
, and R
T D A 1 4 0 0 – R e v . 0 . 6 5 / K L i / 0 2 . 0 6
=
VPP
F
FBB
. This input is
2
. It should be
(2R
FBC
)
.
I,
R
F,
I,