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參數(shù)資料
| 型號： | LA4708 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 20 W 2-channel BTL AF Power Amplifier for Car Stereos(用于汽車立體聲的輸出功率20W雙BTL AF功率放大器) |
| 中文描述： | 20瓦2聲道橋接自動對焦功率放大器汽車音響（用于汽車立體聲的輸出功率20瓦雙橋接自動對焦功率放大器） |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 373K |
| 代理商： | LA4708 |
Features of IC Inside and Usage Notes
Standby function
.
Pin 5 is the standby switch pin. The amplifier is turned on by applying approximately 2.5 V or more to this pin through an
external resistor (R1).
.
If voltage in excess of 13.2 V is to be applied to the standby switch, calculate the value of R1 using the following formula so
that the current flowing into pin 5 is 500 μA or less:
Mute function
.
Pin 6 is the connector for the capacitor that determines the on time in order to prevent pop noise. By grounding this pin, the
amplifier can implement mute operation. In this case, the recovery time depends on C3.
How to reduce pop noise
.
Although the LA4708 reduces pop noise, an electrolytic capacitor of between 0.47 and 2.2 μF can be connected between pin 8
and the pre-GND to further reduce pop noise that occurs when power supply is turned on/off (standby switch on/off). The larger
the capacitance, the lower the frequency of pop noise, and it is barely audible, but sound residue of the sound signal is liable to
linger when power is turned off. Pin 8 is the bias pin for the output amplifier and normally is left open.
Protectors
.
In an output-to-ground and output-to-V
CC
short protector system configuration, if a DC resistor is connected between amplifier
output pin and GND, the protector may operate, causing the amplifier not to start operating. Therefore, as a general rule, no DC
resistor should be connected between amplifier output pin and GND.
.
In order to prevent damage or degradation which may be caused by abnormally heated IC, the LA4708 has a thermal shutdown
protector. Accordingly, if the IC junction temperature (Tj) climbs to around 170 to 180°C due to inadequate heat dissipation, the
thermal shutdown protector will operate to control the output gradually into attenuation.
.
Also be fully careful of handling other protectors built in the LA4708.
Miscellaneous
.
Since pins 1 and 9, which are unused, are connected internally, they must be left open.
.
Pin 10 is an NC pin (no internal connection).
R1 =
Applied voltage – 1.4 V
– 10 k
500 μA
Standby
applied voltage
500 μA or less
About 1.4 V
(2VBE
)
Pin 5 Equivalent
circuit internal IC
LA4708
No.5245-5/9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA4725 | 2-Channel BTL Power Amplifier (30W+30W) with Standby Switch for Car Stereos(用于汽車立體聲雙BTL功率放大器（30W+30W，帶備用開關(guān)）) |
| LA4728 | 2-Channel BTL Power Amplifier (35W+35W) with Standby Switch for Car Stereos(用于汽車立體聲雙BTL功率放大器（35W+35W，帶備用開關(guān)）) |
| LA4741 | 42W 4-Channel BTL Power Amplifier for Car Stereo(用于汽車立體聲四BTL功率放大器（42W× 4）) |
| LA4742 | 45 W Four-Channel Bridge Circuit Power Amplifier |
| LA4743A | 45 W Four-Channel (Bridge Circuit) Power Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA4708N | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC For Car Stereos 20W 2-channel BTL AF Power Amplifier |
| LA4708N-E | 功能描述:音頻放大器 CLASS-AB POWER AMPLIFIER RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LA4708NF-MB-E | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LA47201L-N-E | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LA47201-N-E | 制造商:ON Semiconductor 功能描述:CARAUDIO AMPLIFIER BTL4CH - Ammo Pack 制造商:ON Semiconductor 功能描述:FNFLD / CARAUDIO AMPLIFIER BTL4CH |
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