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參數(shù)資料
| 型號(hào)： | L4733TA |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 3 Channel 30W Audio Power Amplifier with Mute |
| 中文描述： | 3頻道功率30W音頻功率放大器靜音 |
| 文件頁數(shù)： | 13/23頁 |
| 文件大小： | 939K |
| 代理商： | L4733TA |
Typical Performance Characteristics
(Continued)
Output Power vs Supply Voltage
Chs 1&3 in Bridge Mode (Note15),
f = 1kHz, R
L
= 8
, 80kHz BW
Output Power vs Supply Voltage
Chs 1&3 in Parallel Mode (Note16),
f = 1kHz, R
L
= 4
, 80kHz BW
20079413
20079415
Output Power vs Supply Voltage
All Chs in Parallel Mode (Note16),
f = 1kHz, R
L
= 2
, 80kHz BW
20079414
Note 15:
Bridge mode graphs were taken using the demo board and inverting the signal to the channel B input.
Note 16:
Parallel mode graphs were taken using the demo board connecting each output through a 0.1
/3W resistor to the load.
Application Information
MUTE MODE
The muting function allows the user to mute the amplifier.
This can be accomplished as shown in the Typical Applica-
tion Circuit. The resistor R
is chosen with reference to the
negative supply voltage and is used in conjunction with a
switch. The switch, when opened or switched to GND, cuts
off the current flow from the MUTE pins to V
, thus placing
the LM4733 into mute mode. Refer to the Mute Attenuation
vs Mute Current curves in the
Typical Performance Char-
acteristics
section for values of attenuation per current out
of each MUTE pin. The resistance R
M
is calculated by the
following equation:
R
M
≤
(|V
EE
| 2.6V) / I
MUTE
Where I
MUTE
≥
0.5mA for each MUTE pin.
The MUTE pins can be tied together so that only one resistor
is required for the mute function. The mute resistor value
must be chosen so that a minimum of 1.5mA is pulled
through the resistor R
. This ensures that each amplifier is
fully operational. Taking into account supply line fluctuations,
it is a good idea to pull out 1mA per MUTE pin or 3mA total
if all pins are tied together.
A turn-on MUTE or soft start circuit may also be used during
power up. A simple circuit like the one shown below may be
used.
200794B7
The RC combination of C
M
and R
M1
may cause the voltage
at point A to change more slowly than the -V
EE
supply
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L473M | 制造商:Cornell Dubilier Electronics 功能描述: 制造商:Mallory Sonalert Products Inc 功能描述: |
| L474EC | 功能描述:標(biāo)準(zhǔn)LED-通孔 RED WATER CLEAR CYLINDRICAL RoHS:否 制造商:Vishay Semiconductors 照明顏色:Red 光強(qiáng)度:0.7 mcd 波長(zhǎng)/色溫:615 nm 顯示角:45 deg 透鏡顏色/類型:Clear, Non-Diffused 正向電流:70 mA 正向電壓:1.83 V to 3.03 V LED 大小:2 mm 系列: 封裝:Tube |
| L474GC | 制造商:Kingbright Corporation 功能描述:LED Uni-Color Green 565nm 2-Pin T-1 |
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| L-474GT | 制造商:Kingbright Corporation 功能描述: |
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