TA2024C Tripath Technology Inc., TA2024C Datasheet - Page 15

• Manufacturer Part Number: TA2024C
• Description: Stereo 15w 4 ? Class-t ?igital Audio Amplifier Using Digital Power Processing ?echnology
• Manufacturer: Tripath Technology Inc.

P e r f o r m a n c e M e a s u r e m e n t s o f t h e T A 2 0 2 4 C
15
Where T
In the above graph, Copper Area is the size of the copper pad on the PC board to which the heat
slug of the TA2024C is soldered. The heat slug must be soldered to the PC Board to increase
the maximum power dissipation capability of the TA2024C package. Soldering will minimize the
likelihood of an over-temperature fault occurring during continuous heavy load conditions. The
vias used for connecting the heatslug to the copper area on the PCB should be 0.013” diameter.
The TA2024C operates by generating a high frequency switching signal based on the audio input.
This signal is sent through a low-pass filter (external to the Tripath amplifier) that recovers an
amplified version of the audio
and typically varies between 100kHz and 1.0MHz, which is well above the 20Hz – 20kHz audio
band. The pattern itself does not alter or distort the audio input signal but it does introduce some
inaudible components.
The measurements of certain performance parameters, particularly noise related specifications
such as THD+N, are significantly affected by the design of the low-pass filter used on the output
as well as the bandwidth setting of the measurement instrument used. Unless the filter has a
very sharp roll-off just beyond the audio band or the bandwidth of the measurement instrument is
limited, some of the inaudible noise components introduced by the Tripath amplifiers switching
pattern will degrade the measurement.
One feature of the TA2024C is that it does not require large multi-pole filters to achieve excellent
performance in listening tests, usually a more critical factor than performance measurements.
Though using a multi-pole filter may remove high-frequency noise and improve THD+N type
measurements (when they are made with wide-bandwidth measuring equipment), these same
filters degrade frequency response. The TA2024C Evaluation Board uses the Test/Application
Circuit in this data sheet, which has a simple two-pole output filter and excellent performance in
listening tests. Measurements in this data sheet were taken using this same circuit with a limited
bandwidth setting in the measurement instrument.
JA
of the package is determined from the following graph:
50
40
30
20
10
0
1
Copper Area (square inches)
2
input.
4
JA
vs Copper Area
3
The frequency of the switching pattern is spread spectrum
4
5
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
6
Pdiss - 1.35W
Pdiss - 2W
Pdiss - 3.4W
TA2024C –KL/1.0/01.06