TDA1400 Tripath Technology, TDA1400 Datasheet - Page 10

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

www.DataSheet4U.com
R
C
R
D
D
C
R
C
Q
Q
C
Q
Q
R
L
C
D
R
R
10
O
S
HBR
G
G
BIAS
G
ISA,
ISA
Z
Z
O
DS
GS
FLT
ISP
ISN
P
N
R
ISB
(VPP). This resistor accounts for the internal V
resistor value should be equal to that of R
voltage Protection section in the Application Information for a detailed discussion of
the internal circuit operation and external component selection.
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 R
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 TDA1400 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.
Panasonic EB capacitors are ideal for the bulk storage (nominally 33uF) due to their
high ripple current and high frequency design.
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 1/2 watt.
Gate diode, which adds additional BBM and serves to match the unequal rise and
fall times of Q
should be used.
Diode that keeps the gate capacitor biased at the proper voltage when the supply
voltage decreases.
Gate capacitor that ac-couples the TDA1400 from the high voltage MOSFETs.
Bias resistors for the increasing supply circuits.
Bias capacitor for the increasing supply circuits.
P-channel bipolar transistor for the circuit which charges the high side gate
capacitors, C
N-channel bipolar transistor for the circuit which charges the low side gate
capacitors, C
Zobel capacitor, which in conjunction with R
frequencies. Use a high quality film capacitor capable of sustaining the ripple current
caused by the switching outputs.
P-channel power-MOSFET of the output stage.
N-channel power-MOSFET of the output stage.
Zobel resistor, which in conjunction with C
frequencies. The combination of R
under both no load conditions or with real world loads, including loudspeakers which
usually exhibit a rising impedance with increasing frequency. Depending on the
program material, the power rating of R
power rating is 2 watts.
Output inductor, which in conjunction with C
waveform into an audio signal. Forms a second order filter with a cutoff frequency
of
Output capacitor, which, in conjunction with L
waveform into an audio signal. Forms a second order low-pass filter with a cutoff
frequency of
Use a high quality film capacitor capable of sustaining the ripple current caused by
the switching outputs.
These diodes must be connected from either the drain of the p-channel MOSFET to
the source of the n-channel MOSFET, or the source of the p-channel MOSFET to
the drain of the n-channel MOSFET This diode absorbs any high frequency
overshoots caused by the output inductor L
In order for this diode to be effective it must be connected directly to the two
MOSFETs. An ultra-fast recovery diode that can sustain the entire supply voltage
should be used here. In most applications a 100V or greater diode must be used.
Resistor that turns Q
Pull-down resistor for the open-drain Fault circuit.
f
C
S
to obtain a specific current limit trip point.
=
1
2 (
π
G
G
f
N
C
, to VPP, in the case where the VPP supply increases in magnitude.
, to VNN, in the case where the VNN supply increases in magnitude.
L
and Q
=
O
C
1
O
2 (
N
P
and Q
)
. An ultra-fast diode with a current rating of at least 200mA
π
and a quality factor of
L
O
P
C
off when no signal is present.
O
)
and a quality factor of
Z
and C
Z
may need to be adjusted. The typical
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
VPP1
Z
Z
, terminates the output filter at high
O
Z
O
minimizes peaking of the output filter
, terminates the output filter at high
, demodulates (filters) the switching
during high output current conditions.
O
. Please refer to the Over / Under-
Q =
, demodulates (filters) the switching
PPSENSE
R
L
C
bias of 2.5V. Nominal
O
Q
=
L
T D A 1 4 0 0 – R e v . 0 . 6 5 / K L i / 0 2 . 0 6
O
R
C
L
O
C
O
.
2
L
O
C
O
.