TA0102A Datasheet, PDF (9/12 Pages) Tripath Technology Inc. – STEREO 150W (4Ω) CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSING (DPPTM) TECHNOLOGY

Tripath Technology, Inc. - Technical Information
Functional Description
TA0102A Amplifier Operation
Figure 3 is a simplified diagram of one channel (channel 1) of a TA0102A amplifier to assist in
understanding its operation.
TA0102A
18 FDBKN1
MUTE
4
R_IN
IN1 6
C_IN
BBM0
7
BBM1
8
OCR1 11
R_OCR1
16 OCS1H+
Over-current
Detection
15 OCS1H-
V_SPOS
R_S
V_BOOT
M
22 HO1
Processing
&
Modulation
21 HO1COM ^RG
19 VN12
M
20 LO1
R_G
17 LO1COM
Low-pass
Filter
R_L
Over-current 13 OCS1L+
Detection
14 OCS1L-
9 GNDKELVIN1
R_S
V_SNEG
2
OVERLOADB
35
HMUTE
V5
3
23
Over/Under
Voltage
24
V_SPOS
V_SNEG
A Gnd
P Gnd
1
28
Figure 3. Simplified TA0102A Amplifier
The audio input signal (IN1) is fed into the processor internal to the TA0102A, where a modulation
pattern is generated. This pattern is spread spectrum and varies between approximately 200kHz and
1.5MHz. Complementary copies of the switching pattern are level-shifted by the MOSFET drivers
and output from the TA0102A where they drive the gates (HO1 and LO1) of external power
MOSFETs that are connected as a half bridge. The output of the half bridge is a power-amplified
version of the switching pattern that switches between V_SPOS and V_SNEG. This signal is then low-pass
filtered to obtain amplified audio.
9
TA0102A, Rev. 3.1/06.01