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參數(shù)資料
| 型號： | LV4991M |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | 0.225 INCH, MFP-8 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 167K |
| 代理商： | LV4991M |
LV4991M
No.A1492-6/11
Cautions for use
1. Input coupling capacitor (C3)
The input coupling capacitor C3 and input resistor R1 make up the high-pass filter, attenuating the bass frequency.
Therefore, the capacitance value must be selected with due consideration of the pass band. Note with care that this
capacitance value affects the pop sound at startup.
Namely, the increased capacitance value will make the pop sound louder.
2. Pin 3 capacitor (C4)
This capacitor C4 is designed to reduce the power ripple. The ripple removal ratio increases when the capacitance is
larger. Note however that this capacitor affects the pop sound at startup.
Design must therefore be made by taking into both features as above described.
3. Pin 4 control (second amplifier stop control function)
Pin 4 is a pin to turn ON/OFF the operation of second amplifier. By using this function, the pop sound at startup can be
reduced. Note that pin 4 can be controlled by applying the voltage described below :
Second amplifier ON
V4 = 1.6 to VCCV or OPEN
Second amplifier OFF
V4 = 0 to 0.3V
When the pin-3 capacitor C4 is downsized, the pop sound becomes louder. The pop sound can be reduced by providing
the time Tmu to stop the second amplifier (see Fig. 1) while utilizing this function of the microcomputor. The
recommended mute time Tmu is as follows.
C4 [
F]
0.1
0.22
0.33
Tmu [ms]
≥ 170
≥ 270
≥ 280
Fig. 1
4. Standby pin (pin 2)
By controlling the standby pin, the mode changeover can be made between standby and operation modes.
Standby mode
V2 = 0 to 0.3V
Operation mode
V2 = 1.9 to VCCV
When using the standby pin as interlocked with power supply as shown in Fig. 2, care should be taken because the
current ISTBY as expressed by the following equation flows through the standby pin.
ISTBY =
VCC1.4V
R3+21k
Fig. 2
VCC
R3
VCC
STBY
7
2
Pin 2:STBY
Pin 4:CNT
Between pins 8 and 5:
OUT1-OUT2
Tmu
time
AMP2:ON
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| LV4991TH | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LV4991M-TLM-H | 功能描述:功率放大器 BTL 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: |
| LV4991TH | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Bi-CMOS IC For Portable Audio Equipment Monaural BTL Power Amplifier |
| LV4991TH-TLM-E | 功能描述:功率放大器 BTL 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: |
| LV4991TT | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Bi-CMOS IC For Portable Audio Equipment Monaural BTL Power Amplifier |
| LV4991TT_08 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Portable Audio Equipment Monaural BTL Power Amplifier |
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