tda2500 Tripath Technology Inc., tda2500 Datasheet - Page 27

• Manufacturer Part Number: tda2500
• Description: Stereo Class-t Digital Audio Amplifier Driver Using Digital Power Processing Dpp
• Manufacturer: Tripath Technology Inc.

The description above should be followed for TA0102A or TA0103A emulation with the exception of the
following component value changes noted in the Table 3.
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TA0102A
TA0103A
DEVICE
Figure 8: Voltage Supply Sensing Structure for TA0104A Emulation
To maintain the same current trip point for the TA010xA based design, simply add 9.1k to the
value of R
design, use 19.1k for each R
Add the 1000pF capacitors (C
repeatable voltage trip points. Please note that the return point is to analog ground (pin 1 on
the TDA2500).
The values of C
increased as compared to the previous TA0104A design due to slightly different internal
compensation. For best performance make sure that the difference between the two channels
idle switching frequency is greater than 40kHz. In addition, make sure that the idle switching
frequency of both channels is maintained above 575kHz.
Other components such as output filter values, MOSFET type, gate resistor values, etc. should
remain unchanged from the TA0104A design. Typical output filter components are 11uH,
0.22uF along with appropriate zobel compensation (15ohm/5W and 0.22uF). Typical MOSFET
choice is the STW34NB20 or similar along with 5.6ohm gate resistors.
It is highly recommended that the supply bypassing (C
shown in the Application/Test circuit is utilized for new designs. This structure has been shown
to minimize output node transients during high current events and will result in a more robust
design.
TABLE 3: External component values for TA0102A and TA0103A emulation
OCR
3.57M
1.33M
12.7k, 1%
used in the legacy design. Thus, if a 10kohm R
9.1k, 1%
FB
R
should be reevaluated. It is likely that the value for channel 2 will need to be
V5
V5
FB
1000pF
1000pF
1.21M
1.33M
AGND
AGND
VNN
VPP
OCR
VB
487k, 1%
649k, 1%
38
37
). These capacitors stabilize the sensing circuit resulting in
resistor in the TDA2500 design.
R
VLOW
VHIGH
VPP1
TDA2500 APPLICATION VALUES
TDA2500
T r i p a t h T e c h n o l o g y , I n c . - T e c h n i c a l I n f o r m a t i o n
487k, 1%
649k, 1%
R
VPP2
HBR
) and diode (D
OCR
TDA2500 – KL/ Rev. 0.9/05.05
was used for a TA0104A
442k, 1%
590k, 1%
R
VNN1
O
) clamping structure
1.33M, 1%
1.78M, 1%
R
VNN2