- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄358731 > LA4905 (Sanyo Electric Co.,Ltd.) 17-W, 2-Channel BTL AF High-Efficiency Power Amplifier for Car Stereo Systems PDF資料下載
參數(shù)資料
| 型號(hào)： | LA4905 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 元件分類(lèi)： | 音頻放大器 |
| 英文描述： | 17-W, 2-Channel BTL AF High-Efficiency Power Amplifier for Car Stereo Systems |
| 中文描述： | 17鎢，雙通道橋接自動(dòng)對(duì)焦高效率數(shù)字功放的汽車(chē)音響系統(tǒng) |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大?。?/td> | 549K |
| 代理商： | LA4905 |
2. IC Internal Characteristics and Usage Notes
Switching Regulator
To reduce power dissipation, the LA4905 includes a signal-following type switching regulator. When there is no input
signal, the self-excited oscillator operates at about 100 kHz.
It is desirable for the amplifier block to be separated as far as possible from the tuner block to prevent interference from
extraneous radiation within the set. Also, when designing the printed circuit board layout, the pattern lines for the
switching regulator components should be made as short and as broad as possible.
To prevent degradation of the characteristics of the LA4905 itself, the separation between the switching regulator
components and the IC input block (the input block pattern, the input capacitors, and the beep capacitor) should be at
least 1.5 cm.
Standby Function
Pin 21 is the standby switch pin. The amplifier is turned
on by applying a voltage of about 3 V or higher through
an external resistor (R1).
The value of R1 must be determined, using the following
formula, so that the pin 5 influx current remains under
500 μA if a voltage in excess of 13.2 volts is applied as
the standby switch voltage.
applied voltage – 1.4 V
R1 = —————————— – 10 k
500 μA
BEEP Pin (pin 4)
If the BEEP pin is used, use a value for R102 shown in
the figure that is under 100
and is as small as possible
to prevent degradation of the IC output noise voltage
(VNO).
Protection Circuits
The LA4905 includes a built-in thermal protection
circuit to prevent destruction or degradation if the IC
generates abnormal amounts of heat. The thermal
protection circuit controls the IC so that the output is
gradually lowered if the IC junction temperature (Tj)
increases to about 160°C due to an insufficient heat sink
or other reason.
The overvoltage protection circuit operates if the V
CC
voltage exceeds a value of about 20 volts.
Although the LA4905 includes an on-chip protection
circuit for shorts to V
CC
and shorts to ground, it does not
include a load shorted protection circuit. The idea behind
this design is that the thermal protection circuit will
protect the IC against load shorting. However, since load
shorting can also cause heating in external transistors and
coils, designs should take load shorting into
consideration.
Other Notes
Pin 22 is an NC pin, and is not connected within the
package.
No. 5504-6/10
LA4905
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA4906 | 17-W, 2-Channel BTL AF High-Efficiency Power Amplifier for Car Audio Systems |
| LA50-S | Current Transducer LA 50-S/SP1 |
| LA5002 | 2V 60mA Low Saturation Voltage Regulator(輸出電壓2V，輸出電流為60mA低飽和電源穩(wěn)壓器) |
| LA5008M | 8V 60mA Low Saturation Voltage Regulator(輸出電壓8V，輸出電流為60mA低飽和電源穩(wěn)壓器) |
| LA5112N | COMPACT DC MOTOR SPEED CONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA4906 | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:17-W, 2-Channel BTL AF High-Efficiency Power Amplifier for Car Audio Systems |
| LA4917H | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:Monolithic Linear IC Audio Output for TV application High-Effciency Two-Channel 7W BTL Power Amplifier ICs |
| LA4919N | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:Monolithic Linear IC Two-Channel 10W BTL High-Efficiency TV Audio Output Power Amplifier |
| LA4B-M1C2LV-G | 制造商:IDEC CORPORATION 功能描述:Switch Push Button N.O./N.C. DPDT Flush Rectangular Button 0.1A 250VAC 250VDC Momentary Contact PC Pins Panel Mount/Through Hole |
| LA4B-M1C2LV-W | 制造商:IDEC CORPORATION 功能描述:Switch Push Button N.O./N.C. DPDT Flush Rectangular Button 0.1A 250VAC 250VDC Momentary Contact PC Pins Panel Mount/Through Hole |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。