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參數(shù)資料
| 型號(hào)： | LA4632 |
| 元件分類(lèi)： | 音頻／視頻放大 |
| 英文描述： | 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PSFM12 |
| 封裝： | SIP-12 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大小： | 159K |
| 代理商： | LA4632 |
LA4632
No.8178-5/8
When an voltage of +5V is applied to the mute pin through the
external 15k
resistor, the pin 6 voltage becomes about 1.85V.
(The muting function activation level in the specifications is 1.7V
minimum.) The pin 6 influx current (Imute) at this time will be
roughly 210
A.
Although it is possible to change the mute pin applied voltage or the
values of the mute pin external components, if the pin 6 voltage
(and pin 6 influx current) is too high, or if the pin 6 external
component time constant is too short, the amplitude of impulse
noise in the system may rise. This phenomenon must be taken into
account when designing this circuit.
Other items
Standby function
The IC's pin 5 is a standby pin. The amplifier is turned on when the
voltage applied to this pin is about 2V or higher. (The value in the
specifications is 2.5V minimum.) If a voltage of +5V is directly
applied to the standby pin, the pin 5 influx current will be about
230
A.
ISTB =
5V–2VBE (about 1.55V)
15k
= 230A
If a voltage that exceeds the upper limit voltage given in the
specifications (10V) is applied as the standby pin voltage, calculate
a value for an external resistor RSTB from the following formula so
that the pin 5 influx current does not increase excessively (use a
value of under about 500
A as the initial target value).
RSTB =
Applied voltage - 2VBE (about 1.55V)
ISTB (Under 500A)
–15k
Usage Notes
Notes on the Maximum Ratings
If this IC is used in the vicinity of the maximum ratings, even the slightest fluctuations in the operating conditions
could cause those ratings to be exceeded, making the destruction of the device possible. Applications must be
designed with adequate margins in the supply voltage and other parameters so that the devices is always used in
ranges that do not exceed the maximum ratings.
Notes on Protection Circuits
While the LA4632 provides a full complement of built-in protection circuits, care is required in their use. In particular,
be careful not to inadvertently short IC pins to each other.
[Notes on the short to power, short to ground, and load shorting protection circuit]
This protection circuit operates when an abnormal short such as a short to power (a short between an output and
VCC), a short to ground (a short between an output and ground), or a load short (a short between the output ± sides)
occurs. Although this circuit may not operate when the VCC voltage is under about 9V, the thermal protection
circuit is thought adequate to protect the IC in that case.
This protection circuit is the type that continues to operate while the above listed short state continues and recovers
automatically as soon as the abnormality is resolved. However, there are cases where, depending on the operating
conditions, the protection circuit locks and the protection operation continues. In these cases, the protection circuit
can be cleared by switching to standby mode or cutting and reapplying power.
Note that if the output is shorted to power in the state where the IC is in the standby state (amplifier operation is
turned off) and VCC is over about 20V, an offset may occur between the plus and minus outputs. If a load is
connected in this state, current may flow in through the load and the IC may be destroyed.
In the following usage conditions, a symptom in which the output audio is cut off at high outputs due to protection
circuit operation. Depending on the end product specifications, it may be necessary to check for this phenomenon.
Situations where both channels are operating in a manner that the IO Peak per channel exceeds 1A at low RL (high
loads) and high VCC (The higher the chip temperature the easier it is for this phenomenon to occur.)
The "Allowable operating supply voltage range (VCC op)" item in the operating conditions specifications provides
specific target operating conditions so that the above phenomenon will not occur under severe usage conditions
(high temperatures, high outputs. (See the different VCC op ranges for different RLvalues.)
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| LA4635B | 4.5 W, 2 CHANNEL, AUDIO AMPLIFIER, SFM12 |
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| LA4663N | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, ZFM14 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA4632-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(lèi)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 |
| LA4635 | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:2-Channel BTL AF Power Amplifier |
| LA4635A | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:For General Audio Use 2-Channel BTL AF Power Amplifier |
| LA4635B | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:2-Channel BTL AF Power Amplifier |
| LA4636 | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:For General Audio Use 11 W 2-Channel BTL AF Power Amplifier |
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