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参数资料
| 型号： | LM4701MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 30 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| 封装： | WAFER |
| 文件页数： | 3/17页 |
| 文件大小： | 579K |
| 代理商： | LM4701MWC |
Typical Performance Characteristics (Continued)
Application Information
MUTE MODE
By placing a logic-high voltage on the mute pin, the signal
going into the amplifiers will be muted. If the mute pin is left
floating or connected to a logic-low level, the amplifier will be
in a non-muted state. Refer to the Typical Performance
Characteristics section for curves concerning Mute Attenu-
ation vs Mute Pin Voltage.
STANDBY MODE
The standby mode of the LM4701 allows the user to drasti-
cally reduce power consumption when the amplifier is idle.
By placing a logic-high voltage on the standby pin, the ampli-
fier will go into Standby Mode. In this mode, the current
drawn from the V
CC supply is typically less than 10 A total
for both amplifiers. The current drawn from the V
EE supply is
typically 2.1 mA. Clearly, there is a significant reduction in
idle power consumption when using the standby mode. Re-
fer to the Typical Performance Characteristics section for
curves showing Supply Current vs Standby Pin Voltage for
both supplies.
UNDER-VOLTAGE PROTECTION
Upon system power-up, the under-voltage protection cir-
cuitry allows the power supplies and their corresponding ca-
pacitors to come up close to their full values before turning
on the LM4701 such that no DC output spikes occur. Upon
turn-off, the output of the LM4701 is brought to ground be-
fore the power supplies such that no transients occur at
power-down.
OVER-VOLTAGE PROTECTION
The LM4701 contains over-voltage protection circuitry that
limits the output current to approximately 3.5 Apk while also
providing voltage clamping, though not through internal
clamping diodes. The clamping effect is quite the same,
however, the output transistors are designed to work alter-
nately by sinking large current spikes.
SPiKe PROTECTION
The
LM4701
is
protected
from
instantaneous
peak-temperature stressing of the power transistor array.
The Safe Operating Area graph in the Typical Performance
Characteristics section shows the area of device operation
where SPiKe Protection Circuitry is not enabled. The wave-
form to the right of the SOA graph exemplifies how the dy-
namic protection will cause waveform distortion when en-
abled.
THERMAL PROTECTION
The LM4701 has a sophisticated thermal protection scheme
to prevent long-term thermal stress of the device. When the
temperature on the die reaches 165C, the LM4701 shuts
down. It starts operating again when the die temperature
drops to about 155C, but if the temperature again begins to
rise, shutdown will occur again at 165C. Therefore, the de-
vice is allowed to heat up to a relatively high temperature if
Pulse Power Limit
DS100835-40
Pulse Power Limit
DS100835-41
Supply Current vs
Case Temperature
DS100835-42
Standby Current (I
CC)vs
Standby Pin Voltage
DS100835-43
Supply Current (I
EE)vs
Standby Pin Voltage
DS100835-44
Input Bias Current vs
Case Temperature
DS100835-45
LM4701
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4701T | 制造商:NSC 制造商全称:National Semiconductor 功能描述:LM4701 Overture⑩ Audio Power Amplifier Series 30W Audio Power Amplifier with Mute and Standby Modes |
| LM4701T/NOPB | 功能描述:IC AMP AUDIO PWR 30W AB TO220-9 RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Overture™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
| LM4701T/NOPB | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC |
| LM4702 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:LM4702 Overture Audio Power Amplifier Series Stereo High Fidelity 200 Volt* Driver with Mute |
| LM4702A | 制造商:NSC 制造商全称:National Semiconductor 功能描述:LM4702 Overture Audio Power Amplifier Series Stereo High Fidelity 200 Volt* Driver with Mute |
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