CXAR41280是一款立体声音频功率放大器，采用16针SOP热敏垫封装，具有直流音量控制功能。在5V电源电压下，它能以桥接负载（BTL）模式将1.9W的连续有效值电源输出到每个通道的4Ω负载。在上述操作条件下，其THD小于1%。为了简化笔记本电脑应用中的音频系统设计，CXAR41280支持驱动扬声器的桥接负载（BTL）模式和驱动耳机的单端（SE）模式。对于低电流消耗应用程序，支持关机模式以在CXAR41280空闲时禁用它。电流消耗可降低到1μA以下。内部直流音量增益设置范围为+20dB到-80dB，32步。通过施加合适的直流电压，可以很容易地获得预期的直流体积增益。cxar41280嵌入了depop电路以抑制通电或断电转换噪声。它还支持最大输出功率钳位功能，以防止扬声器烧坏。采用热保护电路，避免意外损坏。
32步直流音量控制，从+20dB~-80dB
·Depop电路集成
·1%THD+N时的输出功率，VDD=5V
--1.9W/CH（典型）到4Ω负载
--1.25W/CH（典型）进入8Ω负载
·10%THD+N时的输出功率，VDD=5V
--2.4W/CH（典型）到4Ω负载
--1.55W/CH（典型）输入8Ω负载
支持桥梁捆绑荷载（BTL）和单端（SE）模式
最大输出功率夹紧电路集成
超低关机电流
热关机保护
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[ CXAR41280 ]
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产品概述 返回TOP
The CXAR41280 is a stereo audio power amplifier with dc volume control in 16-pin SOP thermal pad package. It can deliver 1.9W continuous RMS power into 4Ω load per channel in Bridge-Tied Load (BTL) mode at 5V supply voltage. Its THD is smaller than 1% under the above operation condition. To simplify the audio system design in the notebook application, the CXAR41280 supports the Bridge-Tied Load (BTL) mode for driving the speakers, Single-End (SE) mode for driving the headphone. For the low current consumption applications, the shutdown mode is supported to disable the CXAR41280 when it is idle. The current consumption can be reduced below 1μA. The internal DC volume gain setting is ranged from +20dB to -80dB with 32 steps. It is easily to get the expected DC volume gain by applying the volume pin with a suitable dc voltage. The CXAR41280has embedded depop circuitry to suppress the power-on or power-off transition noises. It also supports the maximum output power clamping function to protect the speakers from burned-out. Thermal protection circuitry is implemented to avoid unintentionally damaging.
产品特点 返回TOP
„ 32 Steps DC Volume Control from +20dB ~-80dB
„ Depop Circuitry Integrated
„ Output Power at 1% THD+N, VDD=5V
--1.9W/CH (typical) into a 4Ω Load
--1.25W/CH (typical) into a 8Ω Load
„ Output Power at 10% THD+N, VDD=5V
--2.4W/CH (typical) into a 4Ω Load
--1.55W/CH (typical) into a 8Ω Load
„ Bridge-Tied Load (BTL) and Single-Ended (SE) Modes Supported
„ Maximum Output Power Clamping Circuitry Integrated
„ Ultra Low Shutdown Current
„ Thermal Shutdown Protection
„ SOP-16 Package Available
应用范围 返回TOP
Notebooks
„ LCD Monitor or TV
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
电路原理图 返回TOP
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Stereo Audio Amplifier |
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|
Part NO. |
VDD (V) min |
VDD (V) max |
POUT THD=1% (W,Ohm) |
POUT(mW) THD=10% (W,Ohm) |
PSRR (dB) |
Gain setting |
Enable Active |
Note |
Package |
|
4.5 |
5.5 |
2.0, 4 |
2.5, 4 |
68 |
Fixed/ADJ |
High |
BTL, De-pop |
TSSOP-20(FD) |
|
|
-- |
6 |
2.0, 4 |
2.6, 4 |
65 |
ADJ |
Low/High |
BTL, Mute, De-pop, POUT(max) Clamping |
TSSOP-24(FD)/ QFN4X4-24 |
|
|
3 |
5.5 |
1.2, 4 |
2.0, 4 |
68 |
Fixed/ADJ |
Low |
DC volume control, PC-Beep |
TSSOP-28(FD)/ TQFN5X5-28 |
|
|
4.5 |
5.5 |
1.9, 4 |
2.6, 4 |
50 |
Fixed |
High |
BTL, SE, OTP |
SOP-16(FD) |
|
|
3 |
5.5 |
1.5, 4 |
2.1, 3 |
-- |
ADJ |
Low/High |
BTL, De-pop |
TQFN3X3-16 |
|
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