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APA2012QBI-TRG Datasheet(PDF) 10 Page - Anpec Electronics Coropration

Part # APA2012QBI-TRG
Description  3W Mono Class-D Audio Power Amplifier
Download  19 Pages
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Manufacturer  ANPEC [Anpec Electronics Coropration]
Direct Link  http://www.anpec.com.tw
Logo ANPEC - Anpec Electronics Coropration

APA2012QBI-TRG Datasheet(HTML) 10 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. A.3 - Oct., 2013
www.anpec.com.tw
10
APA2012
Application Information
Figure 1. APA2012 Output waveform (Voltage& Current)
Fully Differential Amplifier
The APA2012 is a fully differential amplifier with differen-
tial inputs and outputs. The fully differential has some
advantages versus traditional amplifier. First, there is no
need for the input coupling capacitors, because the com-
mon-mode feedback will compensate the input bias. The
inputs can biased from 0.5V~V
DD-0.5V, and the outputs
still be biased at mid-supply of APA2012. If the inputs are
biased out of the input range, the coupling capacitors are
required. Second, No need the mid-supply capacitor (C
B),
this is because any shift of the mid-supply of APA2012,
will have the same affect both positive & negative channel,
and will cancel at the differential outputs. Third, The fully
differential amplifier will cancel the GSM RF transmitter’s
signal (217Hz).
Class-D Operation
Shutdown Function
In order to reduce power consumption while not in use,
the APA2012 contains a shutdown function to externally
turn off the amplifier bias circuitry. This shutdown feature
turns the amplifier off when logic low is placed on the SD
pin for APA2012. The trigger point between a logic high
and logic low level is typically 0.4VDD. It is best to switch
between ground and the supply voltage VDD to provide
maximum device performance. By switching the SD pin
to low level, the amplifier enters a low-consumption- cur-
rent state,I
DD for APA2012 is in shutdown mode. On nor-
mal operating, APA2012’s SD pin should pull to high level
to keeping the IC out of the shutdown mode. The SD pin
should be tied to a definite voltage to avoid unwanted
state changes.
The APA2012 modulation scheme is show in figure 1,
The outputs V
OP and VON are in phase with each other
when no input signals. When output > 0V the duty cycle of
VOP is greater than 50% and V
ON is less than 50%, and
when output <0V, the duty cycle of VOP is less than 50%
and V
ON is greater than 50%. This method reduces the
switching current across the load, and reduces the I2R
losses in the load that improve the amplifier’s efficiency.
This modulation scheme has very short pulses across
the load, this making the small ripple current and very
little loss on the load, and the LC filter can be eliminate in
most applications. Added the LC filter can increase the
efficiency by filter the ripple current.
VOUTP
VOUTN
VOUT
(VOUTP-VOUTN)
IOUT
Output = 0
Output > 0
Output < 0
VOUTP
VOUTN
VOUT
(VOUTP-VOUTN)
IOUT
VOUTP
VOUTN
VOUT
(VOUTP-VOUTN)
IOUT
Square Wave Into the Speaker
Apply the square wave into the speaker may cause the
voice coil of speaker jump out the air gap and deface the
voice coil. But this depend on the amplitude of square
wave is high enough and the bandwidth of speaker is
high than the square wave¡¦s frequency. For 250KHz
switching frequency, this is not issue for the speaker,
because the frequency is beyond the audio band, and
can¡¦t significantly move the voice coil, as cone movement
is proportional to 1/f
2
for frequency out of audio band.


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