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參數資料
| 型號： | LA4814V |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| 封裝： | 0.225 INCH, SSOP-14 |
| 文件頁數： | 14/17頁 |
| 文件大小： | 576K |
| 代理商： | LA4814V |
LA4814V
No.A0972-6/17
5.Second amplifier control function (only when BTL mode is used)
The second amplifier control function is a function to reduce the startup pop-noise in BTL mode. The pop noise can be
reduced by first turning on the IC while the second amplifier is stopped, then after the potential inside the IC gets
stabilized, turning on the second amplifier.
The values shown below are recommended for the control time.
C5 [
μF]
2.2
3.3
4.7
10
Twu [ms]
200
250
300
500
* Twu : Time after releasing standby to second amplifier turn-on
a) When using microcomputer control
The second amplifier can be controlled by applying the following voltages to pin 9.
Second amplifier operation mode … V9
≤ 0.3V
Second amplifier stop mode … V9
≥ 1.6V
However, set the resistance value of the resistor R6 inserted in series in such a way that the condition in the following
formula is met.
R6
≤ 16.2 × (Vcnt - 1.6) kΩ
The pin 9 injected current is expressed by the following formula :
I9 = (57.6
× Vcnt - 31.7)/(1+0.058 × R6) μA
Fig. 3
b) When microcomputer control is not possible
When the microcomputer cannot be used, the second amplifier can be controlled by adding the external components
as shown in Fig. 4.
VCC (V)
5
3.6
3
R7 (k
Ω)
10
6.8
R9 (k
Ω)
120
68
56
C8 (
μF)
100
Fig. 4
6.Shorting between pins
When power is applied with pins left short-circuited, electrical deterioration or damage may result.
Therefore, check before power application if pins are short-circuited with solder, etc. during mounting of IC.
7.Load shorting
If the load is left short-circuited for a long period of time, electrical deterioration or damage may occur.
Never allow the load to short-circuit.
8.Maximum rating
When IC is used near the maximum rating, there is a possibility that the maximum rating may be exceeded even under
the smallest change of conditions, resulting in failure. Take sufficient margin for variation of supply voltage and use IC
within a range where the maximum rating will never be exceeded.
Vcnt
CNT
R6
V9
9
+
R8
100k
Ω
R7
C8
R5
R9
VCC
CNT
STBY
14
9
8
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| LA4814V-TLM-E | 功能描述:功率放大器 POWER AMPLIFIER RoHS:否 制造商:TriQuint Semiconductor 封裝 / 箱體: 工作電源電壓:28 V 電源電流:2.5 A 工作溫度范圍: 封裝: |
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