PT2300 데이터 시트보기 (PDF) - Princeton Technology
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PT2300 Datasheet PDF : 15 Pages
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2W x 2 Class AB Audio Power Amplifier
PT2300
OVER TEMPERATURE PROTECTION
The PT2300 has a built-in over temperature protection circuit, it will turn off all power output when the
chip temperature over 120℃, the chip will return to normal operation automatically after the
temperature cool down to 80℃.
POP AND CLICK SURPPRESS
A power amplifier uses single supply voltage may almost have noise on output in the power-on period.
It is because of the output DC potential needs time to stable on 1/2Vcc, the period relative with the
capacitance on the Bypass pin. Higher CB value will extend the stable time, and also can suppress the
noise when power-on. In supply voltage=5V and CB=2.2µF, stable time is about 300ms. The value of
CB also relative with the value of the DC blocking capacitor connected in input terminal. In general
condition the time constant of DC blocking capacitor should be less than CB stable time.
Recommend parts values please refer to application circuit.
VOLUME CONTROLLER
The PT2300 has a built-in 32 steps volume controller, output volume is determinate by the voltage
applied on the DC Vol pin. Higher DC voltage means more output level, the relation between the
volume setup and DC Vol, please refer the following table.
[Supply voltage 5V, DC Vol input voltage showing by percentage of Vcc]
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Volume
(dB)
0
-1.5
-3
-4.5
-6
-7.5
-9
-10.5
-12
-13.5
-15
-16.5
-18
-19.5
-21
-22.5
Voltage range (%VCC)
High
Low
Vcc
64.0
64.1
62.6
63.1
60.9
61.1
59.2
60.4
57.6
57.8
55.7
56.4
53.8
53.8
51.3
52.1
48.5
48.7
46.8
47.5
45.1
45.4
43.3
44.7
41.6
41.8
39.5
40.4
37.4
37.8
35.4
Step
Volume
(dB)
17 -24
18 -25.5
19 -27
20 -28.5
21 -30
22 -31.5
23 -33
24 -34.5
25 -36
26 -37.5
27 -39
28 -40.5
29 -42
30 -43.5
31 -45
32 MUTE
Voltage range (%VCC)
High
Low
36.0
29.7
29.9
28.0
28.7
26.3
26.6
24.6
26.0
22.9
23.2
20.9
21.8
18.9
19.3
15.9
17.2
13.4
13.7
11.6
12.4
9.8
10.2
8.0
9.5
6.3
6.7
4.2
5.2
2.1
2.7
GND
PT2300 V1.0
-5-
December, 2005
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