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參數資料
| 型號： | LA4809M |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.16 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO12 |
| 封裝： | 0.225 INCH, MFP-12 |
| 文件頁數： | 13/15頁 |
| 文件大小： | 252K |
| 代理商： | LA4809M |
LA4809M
7. Selection of the maximum output power value (handling of Pin 10)
This IC enables selection of two types of maximum output power value according to the handling method of Pin 10.
The regulator circuit for output power control is built in, in which, by changing the voltage of Pin 2, the regulator
voltage : Vreg is changed to enable selection of the maximum output power value.
Mode-A (PO max = 55mW) : Pin 10 set to the OPEN state
Pin 2 voltage : V2 = 2.1V,
Internal regulator voltage : Vreg = 4.2V,
Amplifier operating reference voltage : Vref = 2.1V
Mode-B (PO max = 160mW) : Pin 10 connected to the GND line
Pin 2 voltage : V2 = 3.1V,
Internal regulator voltage : Vreg = 6.2V,
Amplifier operation reference voltage : Vref = 3.1V
When the maximum output power value is to be changed under CPU
VCC
from CPU
10k
Ω
22
μA
PLS
10
control, use the NPN transistor as shown in Fig.4, so that the Pin 10
voltage approaches the GND potential (0.1V or below) sufficiently.
Fig.4
8. Change of the maximum output power value (by handling Pin 2)
Pin 2 voltage : V2 is determined from the constant-current source and internal resistance as shown in Fig.5.
Operating
Mode-A : 54kΩ used
Mode-B : 80k
Ω (54kΩ + 26kΩ) used
Not operating (at a time of falling)
157kΩ (54kΩ + 26kΩ + 77kΩ) used
The internal regulator voltage and amplifier operating reference voltage are generated from this Pin 2 voltage.
Regulator voltage : Vreg = V2
× 2
Amplifier operating reference voltage : Vref = V2
× 1
Accordingly, to change the maximum output power value, connect the resistance : Rrf between Pin 2 and GND as
shown in Fig.5. This will cause change in the Pin 2 voltage. Note that, in view of circuit operation, the Pin 2 voltage
must be set to 1.6V or above.
If the discharge constant is not to be changed, Use the NPN transistor to control the Rrf connection as shown in Fig.6.
39
μA
26k
Ω
77k
Ω
54k
Ω
PLS-cnt
STBY-cnt
VCC
Rrf
RF
STBY
from CPU
2
Crf
Rrf
RF
2
3
Fig.5
Fig.6
9. Standby pin (Pin 3)
By controlling the standby pin, the mode can be changed over between standby and operation. Though this control is
possible directly by the CPU output port, the control may be exposed to adverse affect of digital noise from CPU. It is
recommended therefore to insert series resistance (1k
Ω or more).
Standby mode
V3 = 0V to 0.6V
Operation mode
V3 = 2V to 9V (for VCC = 9V or above), V3 = 2V to VCC (for VCC = less than 9V)
Continued on next page.
No.A1569-7/15
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LA4809M-TLM-E | 功能描述:音頻放大器 STEREO HP AMPLIFIER RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LA4810M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC Stereo/Monaural BTL Power |
| LA4814JA | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC 2-Channel Power Amplifier |
| LA4814JA-AE | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LA4814JA-ZE | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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