Tripath Technology, Inc. - Technical Information
E X T E R N A L C O M P O N E N T S D E S C R I P T I O N (Refer to the Application/Test Circuit)
Components Description
RI
RF
CI
Inverting input resistance to provide AC gain in conjunction with RF. This input is
biased at the BIASCAP voltage (approximately 2.5VDC).
Feedback resistor to set AC gain in conjunction with RI. Please refer to the Amplifier
Gain paragraph, in the Application Information section.
AC input coupling capacitor, which, in conjunction with RI, forms a high pass filter at
.
fC = 1 (2πRICI)
RFBB
Feedback divider resistor connected to AGND. The value of this resistor depends
on the supply voltage setting and helps set the TK2051 gain in conjunction with RI,
RF, RFBA, and RFBC. Please see the Modulator Feedback Design paragraphs in the
Application Information Section.
RFBC
Feedback resistor connected from either the OUT1A/OUT2A to FDBKP1/FDBKP2
or OUT1B/OUT2B to FDBKN1/FDBKN2. The value of this resistor depends on the
supply voltage setting and helps set the TK2051 gain in conjunction with RI, RF, RFBA,
and RFBB. It should be noted that the resistor from OUT1/OUT2 to
FBKOUT1/FBKOUT2 must have a power rating of greater than
.
)
P
= VPP2 (2RFBC
DISS
Please see the Modulator Feedback Design paragraphs in the Application
Information Section.
CFB
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.
ROFB
ROFA
Potentiometer used to manually trim the DC offset on the output of the TK2051.
Resistor that limits the manual DC offset trim range and allows for more precise
adjustment.
RREF
CS
Bias resistor. Locate close to pin 15 and ground at pin 20.
Supply decoupling for the power supply pins. For optimum performance, these
components should be located close to the TC2000/TP2051 and returned to their
respective ground as shown in the Application/Test Circuit.
Zobel capacitor, which in conjunction with RZ, terminates the output filter at high
CZ
RZ
frequencies. Use a high quality film capacitor capable of sustaining the ripple current
caused by the switching outputs.
Zobel resistor, which in conjunction with CZ, terminates the output filter at high
frequencies. The combination of RZ and CZ minimizes peaking of the output filter
under both no load conditions or with real world loads, including loudspeakers which
usually exhibit a rising impedance with increasing frequency. The recommended
power rating is 1 Watt.
LO
Output inductor, which in conjunction with CO, demodulates (filters) the switching
waveform into an audio signal. Forms a second order filter with a cutoff frequency
of
and a quality factor of
.
LO CO
f
= 1 (2π L
C )
O
Q = RL CO
C
O
CO
Output capacitor, which, in conjunction with LO, demodulates (filters) the switching
waveform into an audio signal. Forms a second order low-pass filter with a cutoff
frequency of
and a quality factor of
. Use
LO CO
f
= 1 (2π L
C )
O
Q = RL CO
C
O
a high quality film capacitor capable of sustaining the ripple current caused by the
switching outputs. Electrolytic capacitors should not be used.
High-frequency bypass capacitor for VCC – GND on each supply pin. A 50V rating is
required for this component.
CHBR
CSN
Optional snubber capacitor, which in conjunction with RSN, reduces overshoot on
non-optimal layouts. Only required if switching output overshoot is above rated
voltage of TP2501. Use low-dissipation type (NPO).
RSN
Optional snubber resistor, which in conjunction with CSN, reduces overshoot on non-
optimal layouts. Only required if switching output overshoot is above rated voltage
of TP2501. Required ¼ Watt rating.
7
TK2051 – SB/1.0/8-02
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