TA0103A View Datasheet(PDF) - Unspecified
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TA0103A Datasheet PDF : 18 Pages
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Tripath Technology, Inc. - Technical Information
Functional Description
TA0103A Amplifier Operation
Figure 3 is a simplified diagram of one channel (channel 1) of a TA0103A amplifier to assist in
understanding its operation.
TA0103A
18 FDBKN1
MUTE
4
RIN
IN1 6
CIN
BBM0
7
BBM1
8
OCR1 11
ROCR1
16 OCS1H+
Over-current
Detection
15 OCS1H-
VSPOS
RS
VBOOT
M
22 HO1
Processing
&
Modulation
21 HO1COM
RG
19 VN12
M
20 LO1
RG
17 LO1COM
Low-pass
Filter
RL
Over-current 13 OCS1L+
Detection
14 OCS1L-
9 GNDKELVIN1
RS
VSNEG
2
OVERLOADB
35
HMUTE
V5
3
23
Over/Under
Voltage
24
VSPOS
VSNEG
A Gnd
P Gnd
1
28
Figure 3: Simplified TA0103A Amplifier
The audio input signal (IN1) is fed to the processor internal to the TA0103A, 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 TA0103A 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 VSPOS and VSNEG. This signal is then low-pass
filtered to obtain amplified audio.
The processor portion of the TA0103A is operated from a 5-volt supply (between V5 and AGND). In
the generation of the complementary modulation pattern for the output MOSFETs, the processor
inserts a “break-before-make” dead time between when it turns one transistor off and it turns the other
one on in order to minimize shoot-through currents in the MOSFETs. The dead time can be
programmed by setting the break-before-make control bits, BBM0 and BBM1. Feedback information
from the output of the half-bridge is supplied to the processor via FDBKN1. Additional feedback
information to account for ground bounce is supplied via GNDKELVIN1.
9
TA0103 – Rev 3.3/06.00
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