World's smallest audio amplifier class D HT6872





Here is the youtube video for such product review:


The HT6872 is the world smallest audio amplifier which is a class D design. If you are looking for a small 1"x 1" stereo amplifier board, the HT6872 from ICStation.com is the best choice for you. Here is the product detail:



Product Introduction:
1.Anti-clipping function 
2.Excellent full bandwidth EMI suppression performance 
3.Free of filter digital modulation,and it can directly drive loudspeakers
4.Output Power:1.40W (3.6V);2.82W (5.0V);4.71W (6.5V)
5.Good click-pop noise suppression performance 
6.High Signal Noise Rate:87dB
7.Low Quiescent Current:2.64mA (3.6V);3.26mA (5.0V);4.04mA (6.5V)
8.Low Turn-off Current:0.01uA 
9.Overcurrent protection and automatic recovery function 
10.Overheat protection function 

11. Under voltage exception protection function 

You can off course use such product in numerous applications. The use is over your requirement. Here are a few very common and typical uses of this product:

Applications:
1.Portable voice box
2.Iphone/Ipad/MP3 docking 
3.PMP/MP4/MP5 player 
4.Portable game machine
5.PDAs
6.USB voice box 
7.Tablet computers 
8.GPS
9.Cellphones 
10. Intercome
11. Answering machine
12. Telephone amplifier

This product uses the chip HT6872 which have pin detials and description as below.









1.CTRL:ACF mode and turn-off mode control port 
2.BYPASS:analog reference voltage 
3.IN+:reverse phase input port (differential -)
4.IN+:in-phase input port (differential +)
5.OUT+:in-phase output (BTL+)
6.VDD:power 
7.GND:ground 
8.OUT-:reverse phase output port (BTL-)
Input Configuration:
1.HT6872 receives analog differential or single port audio signal input,and it will generate PWM pulse output signal to drive the loudspeaker 
2.Differential Input:DC block capacitor Cin and input resistor Rin respectively input IN+ and IN- port.System gain Av=200/Rin,input RC high speed filter cut-off frequency f=1/2Ï€(RinCin)
3.Single Port Input:Cin optocoupling to IN+ port.IN- port should connect with ground by input resistor and capacitor (the same as Cin and R?in);gain Av and turn-off frequency f is the same as differential input 
4.Please make sure that system front circuit output impedance Zout should be no more than 600 ohm.






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