TP2050 Datasheet, PDF (7/13 Pages) Tripath Technology Inc. – STEREO 50W (8Ω) POWER STAGE

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)
Component
C_S
C_Z
R_Z
L_O
C_O
C_HBR
C_SN
R_SN
C_DM
Description
Supply decoupling for the power supply pins. For optimum performance, these
components should be located close to the TC2000/TP2050 and returned to their
respective ground as shown in the Application/Test Circuit.
Zobel capacitor, which in conjunction with R_Z, terminates the output filter at high
frequencies. Use a high quality film capacitor capable of sustaining the ripple current
caused by the switching outputs.
Zobel resistor, which in conjunction with C_Z, terminates the output filter at high
frequencies. The combination of R_Z and C_Z 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.
Output inductor, which in conjunction with C_O, demodulates (filters) the switching
waveform into an audio signal. Forms a second order filter with a cutoff frequency
of f_C = 1 (2 π L _O C _O ) and a quality factor of Q = R _L C _O L _O C _O .
Output capacitor, which in conjunction with L_O, demodulates (filters) the switching
waveform into an audio signal. Forms a second order low-pass filter with a cutoff
frequency of f_C = 1 (2 π L _O C _O ) and a quality factor of Q = R _L C _O L _O C _O . Use
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 V_CC – GND on each supply pin. A 50V rating is
required for this component.
Optional snubber capacitor, which in conjunction with R_SN, reduces overshoot on
non-optimal layouts. Only required if switching output overshoot is above rated
voltage of TP2500. Use low-dissipation type (NPO).
Optional snubber resistor, which in conjunction with C_SN, reduces overshoot on non-
optimal layouts. Only required if switching output overshoot is above rated voltage
of TP2500. Required ¼ Watt rating.
Differential mode capacitor.
7
TP2050– KL/1.0/07.05