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TPA6030A4 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 13 Page - Texas Instruments

๋ถ€ํ’ˆ๋ช… TPA6030A4
์ƒ์„ธ๋‚ด์šฉ  3-2 STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
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TPA6030A4 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 13 Page - Texas Instruments

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TPA6030A4
SLOS395B โˆ’ DECEMBER 2002 โˆ’ REVISED JANUARY 2005
www.ti.com
13
CLOCK PIN
The TPA6030A4 has an internal clock whose frequency is controlled by the value of an external capacitor on pin 20. The
relationship between the capacitor and the clock frequency is seen in Figure 15.
The clock plays a pivotal role in the functionality of the TPA6030A4. It determines how quickly the volume can change.
When a voltage is applied to the VOLUME pin (or if in SE mode, the SEDIFF or SEMAX pins as well), it causes a change
in volume. The volume does not change instantaneously. It moves one step for every sixteen clock cycles. For example,
if the volume is initially at 36 dB in BTL mode, and then a voltage is applied to the VOLUME pin to set the volume to 0.53 dB,
the volume decreases by 14 steps. With a 47-nF capacitor connected to the clock pin, the clock frequency is 390 Hz. The
time it takes for the volume to reach the desired level is 574 ms. See equation 1.
Total time + # of Volume Steps
16
Clock Frequency
Figure 16 demonstrates how the volume changes with respect to the clock cycles, and how the frequency of the clock
affects the time necessary for each step. The triangular waveform is the voltage on the clock pin, and in this case, the clock
frequency is 390 Hz. Each volume step takes 41 ms, which is consistent with equation 1.
100
1 k
10 k
1
10
100
Clock Capacitor โˆ’ nF
400
50
Figure 15. Clock Frequency vs Capacitance on Clock Pin
Figure 16. How the Volume Changes With Respect to the Clock
(1)


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