微处理(lǐ)器

電(diàn)源与外围

汽車(chē)電(diàn)子

物(wù)联网（IoT）解决方案

汽車(chē)電(diàn)子解决方案

功率放大器（英文(wén)名(míng)称：power amplifier），简称“功放”，是指在给定失真率条件下，能(néng)产(chǎn)生最大功率输出以驱动某一负载（例如扬声器）的放大器。功率放大器在整个音响系统中(zhōng)起到了“组织、协调”的枢纽作(zuò)用(yòng)，在某种程度上主宰着整个系统能(néng)否提供良好的音质(zhì)输出。

利用(yòng)三极管的電(diàn)流控制作(zuò)用(yòng)或场效应管的電(diàn)压控制作(zuò)用(yòng)将電(diàn)源的功率转换為(wèi)按照输入信号变化的電(diàn)流。因為(wèi)声音是不同振幅和不同频率的波，即交流信号電(diàn)流，三极管的集電(diàn)极電(diàn)流永遠(yuǎn)是基极電(diàn)流的β倍，β是三极管的交流放大倍数，应用(yòng)这一点，若将小(xiǎo)信号注入基极，则集電(diàn)极流过的電(diàn)流会等于基极電(diàn)流的β倍，然后将这个信号用(yòng)隔直電(diàn)容隔离出来，就得到了電(diàn)流（或電(diàn)压）是原先的β倍的大信号，这现象成為(wèi)三极管的放大作(zuò)用(yòng)。经过不断的電(diàn)流放大，就完成了功率放大。

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Class-AB Audio Power Amplifier with or without Headphone Driver
Class-D Audio Power Amplifier

Part No.No. of ChannelPower (W)THD+NPSRR (dB)VDD (V)IDD (mA)Package
(Size in mm)		Key FeatureStatus
IS31AP4066D210.10%- 602.7 ~ 5.54QFN-16 (3.0x3.0)Dual 1.3W Stereo Audio Power AmplifierProd
IS31AP4088A2+2 HP30.06%- 802.7 ~ 5.56QFN-16 (4.0x4.0)Dual 2.84WStereo Audio Power Amplifier with Headphone DriverProd
IS31AP4088D230.10%- 602.7 ~ 5.55QFN-16 (4.0x4.0)Dual 2.6W Stereo Audio Power AmplifierProd
IS31AP48332+2HP30.022%- 673.0 ~ 5.56QFN-36(4x4) TQFP48(9x9)Stereo audio PAwith headphone driver,with Multi input & I2C control for 3D,Tone,VolumeProd
IS31AP4990D110.23%- 612.7 ~ 5.54UTQFN-9L (1.5x1.5)1.2W Mono Audio Power Amplifier in UTQFN Package
Prod
IS31AP4991110.03%-652.7~5.55MSOP-8,SOP-81.2W Mono Audio Power Amplifier with active-low standbymodeProd
IS31AP4991A110.074%-682.7~5.53MSOP-8(3.0x5.0)
SOP-8(5.0x6.0)		1.2W Mono AudioPower Amplifier with active-low standbymodeProd
IS31AP4996110.074%-682.7 ~ 5.53MSOP-8 SOP-8Ultra-low power,low distortion Amplifier with BTL outputProd
Part No.No. of ChannelPower (W)THD+NPSRR (dB)VDD (V)IDD (mA)Package
(Size in mm)		Key FeatureStatus
IS31AP200512.950.20%-652.5 ~ 5.52.6DFN-8(3x3) MSOP-82.95W Mono Filter-less Class-D Audio Power AmplifierProd
IS31AP2006130.28%-552.7 ~ 5.52.6DFN-8(3x3)3W Mono Filter-less Class-D Audio Power AmplifierProd
IS31AP2010B130.22%-752.7 ~ 5.52.6UTQFN-9 (1.5x1.5)3W Mono Filter-less Class-DAudio Power AmplifierProd
IS31AP21102Mono 40/ Dual 200.20%-628 ~ 2620eTSSOP-28Differential input,power limit, dynamic temperature control, four selectable gain settingsProd
IS31AP211222x20 BTL,40 PBTL0.20%-604 ~ 2620eTSSOP-28 (9.8x6.5)2x20W stero audio amp with adjustable power limit. Output DC detect, spread spectrum, short circuit detectionSample
IS31AP2145A12.90.20%-722.7 ~ 5.52.0UTQFN-9 (1.5x1.5)2.9W Mono Clip-less & Filter-less Audio Amplifier with Built-in AGCProd
IS31AP2145E12.70.20%-672.7 ~ 5.52.0UTQFN-9 (1.5x1.5)2.7W Mono Clip-less & Filter-less Audio Amplifier with Built in AGCProd

Headphone Driver

Part No.No.of ChannelPower(mW)THD+NPSRR(dB)VDD(V)IDD(mA)Package
(Size in mm)		Key FeatureStatus
IS31AP49122300.024%-952.7 ~ 5.55.0UTQFN-12 (2.0x2.0)High Quality Stereo Headphone Driver withHigh SNR and 7uV Ultra-Low O/P NoiseProd
IS31AP49132300.05%-922.7 ~ 5.55.0QFN-20 (3.0x3.0)3D Surround & Bass Enhanced High Quality Ste- reo Headphone DriverProd

Class-G Speaker Amplifier

Part No.No.of ChannelPower (W)THD+NSNR(dB)VDD(V)IDD(mA)Package
(Size in mm)		Key FeatureStatus
IS31AP4915A120VP-P0.01%1002.5~5.56QFN-16 (4.0x4.0)20VP-P Charge Pump Ceramic Speaker DriverProd

Class-K Speaker Amplifier

Part No.No. of ChannelPower(W)THD+NPSSR(dB)VDD(V)IDD(mA)Package
(Size in mm)		Key FeatureStatus
IS31AP203112W (8Ω Spkr)0.33%-2.7~ 4.55QFN-20 (3.0x3.0)High Power, Ultra-Low EMI Class-K Amplifier with AGCProd
IS31AP203612W (8Ω Spkr)0.05%-72dB3.0 ~ 5.010FCQFN-16AdvancedK-charge pump to boost supply volt- age with a 92% efficiency and increased ampli- fier efficiency of 75%Prod
IS31AP2036A12W (8Ω Spkr)0.05%-64dB3.0~ 5.010FCQFN-16Advanced K-charge pump to boost supply volt- age with a 92% efficiency and increased ampli- fier efficiency of 75%Prod

Digital (I2S) Amplifier

Part No.No.of ChannelPower (W)THD+NPSSR (dB)VDD (V)Package
(Size in mm)		Key FeatureStatus
IS31AP2111220BTL,40 PBTL0.26%-687 ~ 26eTSSOP-242x20W stereo I2S audio amp with 20 bands EQProd
IS31AP2121220Wx2,10Wx2+20W0.20%-7610~26eLQFP-482x25W stereo I2S audio amp with 20 bands EQ, DRC and 2.1ChProd
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