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參數(shù)資料
| 型號： | LA4440 |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 6 W, 2 CHANNEL, AUDIO AMPLIFIER, PSIP14 |
| 封裝： | HEAT SINK, SIP-14 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 467K |
| 代理商： | LA4440 |
LA4440
No.750–4/13
Sample Application Circuit 3. Bridge amplifier 2
Description of External Parts
C1 (C2)
Feedback capacitor : The low cutoff frequency depends on this capacitor.
If the capacitance value is increased, the starting time is delayed.
C3 (C4)
Bootstrap capacitor : If the capacitance value is decreased, the output at low frequencies goes lower.
C5 (C6)
Oscillation preventing capacitor : Polyester film capacitor, being good in temperature characteristic,
frequency characteristic, is used.
The capacitance value can be reduced to 0.047
F depending on the stability of the board.
C7 (C8)
Output capacitor : The low cutoff frequency depends on this capacitor.
At the bridge amplifier mode, the output capacitor is generally connected.
C9
Decoupling capacitor :Used for the ripple filter. Since the rejection effect is saturated at a certain
capacitance value, it is meaningless to increase the capacitance value more than required. This capaci-
tor, being also used for the time constant of the muting circuit, affects the starting time.
R1 (R2)
Filter resistor for preventing oscillation.
R3 (R4)
Resistor for making input signal of inverting amplifier in Voltage Gain Adjust at Bridge Amplifier
Mode (No. 1).
R5
Resistor for adjusting starting time in Voltage Gain Adjust at Bridge Amplifier Mode (No. 2)
C10
Capacitor for preventing oscillation in Voltage Gain Adjust at Bridge Amplifier Mode (No. 2)
C11
Power source capacitor.
R6 (R7)
Used at bridge amplifier mode in order to increase discharge speed and to secure transient stability.
Feaures of IC System and Functions of Remaining Pins
(a) Since the input circuit uses PNP transistors and the input potential is designed to be 0 bias, no input coupling
capacitor is required and direct coupling is available. However, when slider contact noise caused by the variable
resistor presents a problem, connect an capacitor in series with the input.
(b) The open-loop voltage gain is lowered and the negative feedback amount is reduced for stabilization. An increase
in distortion resulted from the reduced negative feedback amount is avoided by use of the built-in unique distor-
tion reduction circuit, and thus distortion is kept at 0.1% (typ.).
(c) A capacitor for oscillation compensation is contained as a means of reducing the number of external parts. The
capacitance value is 35pF which determines high cutoff frequency fH (–3dB point) of the amplifier (fH≈20kHz).
(d) For preventing the IC from being damaged by a surge applied on the power line, an overvoltage protector is
contained. Overvoltage setting is 25V. It is capable of withstanding up to 50V at giant pulse surge 200ms.
(e) No damege occurs even when power is applied at a state where pins 10, 11, and 12 are short-circuited with solder
bridge, etc.
(f) To minimize the variations in voltage gain, feedback resistor RNF is contained and voltage gain (51.5dB) is fixed.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA4445 | 5.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PSFM12 |
| LA4446 | 5.5 W, 2 CHANNEL, AUDIO AMPLIFIER, SFM13 |
| LA4460N | 12 W, 1 CHANNEL, AUDIO AMPLIFIER, PSFM10 |
| LA4461N | 12 W, 1 CHANNEL, AUDIO AMPLIFIER, PSFM10 |
| LA4465 | 12 W, 1 CHANNEL, AUDIO AMPLIFIER, SFM10 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA4440-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 |
| LA4440J-K-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 |
| LA4445 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:5.5W 2-Channel AF Power Amplifier |
| LA4445-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA4446 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:5.5W 2-Channel AF Power Amp |
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