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PDF APA2012 Data sheet ( Hoja de datos )
| Número de pieza | APA2012 | |
| Descripción | 3W Mono Class-D Audio Power Amplifier | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APA2012
3W Mono Class-D Audio Power Amplifier
With Auto-Recovering Short-Circuit Protection
Features
• Operating Voltage: 2.4V-6V
• Low Supply Current
– I =1.8mA at V =5V
DD DD
– I =1.5mA at V =3.6V
DD DD
• Low Shutdown Current
– IDD=0.1µA at VDD=5V
• Output Power
at 1% THD+N
–
1.40W,
at
V =5V,
DD
RL=8Ω
–
0.74W,
at
V =3.6V,
DD
RL=8Ω
– 2.51W, at VDD=5V, RL=4Ω
– 1.32W, at VDD=3.6V, RL=4Ω
at 10% THD+N
– 1.8W, at VDD=5V, RL=8Ω
–
0.91W,
at
V =3.6V,
DD
RL=8Ω
–
3.2W,
at
V =5V,
DD
RL=4Ω
– 1.62W, at VDD=3.6V, RL=4Ω
• Less External Components Required
• Fast Startup Time (4ms)
• High PSRR: 75 dB at 217 Hz
• Short-Circuit and Thermal Protection
• 9-Ball, 1.2mm x 1.2 mm Pitch WLCSP
General Description
The APA2012 is a mono, filter-free Class-D audio ampli-
fier available in a WLCSP package. The gain can be set-
ting by external input resistance. High PSRR and differ-
ential architecture provide increased immunity to noise
and RF rectification. In addition to these features, a fast
startup time and small package size make the APA2012
an ideal choice for both cellular handsets and PDAs.
The APA2012 is capable of driving 1.3 W at 5 V or 600 mW
at 3.6 V into 8 Ω. The APA2012 is also capable of driving
4 Ω. The APA2012 is designed with a Class-D architec-
ture and operating with highly efficiency compared with
Class-AB amplifier. It's suitable for power sensitive
application, such as battery powered devices. The filter-
free architecture eliminates the output filter, reduces the
external component count, board area, and system costs,
and simplifies the design.
The APA2012 provides thermal and over circuit protection.
Simplified Application Circuit
Input
Signal
INN
INP
SHUTDOWN
APA2012
Bias
Circuitry
VON
VOP
OUTN
OUTP
Applications
• Mobile Phones
• Handsets
• PDAs
• Portable multimedia devices
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Oct., 2013
1
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
1 page  
APA2012
Typical Operating Characteristics
THD+N vs. Output Power
10
VDD=3.6V
1 VDD=5.5V
THD+N vs. Output Power
10
VDD=3.6V
1 VDD=5.5V
0.1
0.01
0
VDD=2.4V
VDD=5V
fin=1kHz
Cin=0.1uF
Rin=150kΩ
RL=4Ω
123
Output Power (W)
4
THD+N vs. Frequency
1
Po=1.7W
0.1
Po=0.8W
Po=0.17W
0.01
VDD=5V
Cin=0.1uF
Rin=150kΩ
RL=4Ω
0.001
20 100
1k
Frequency (Hz)
10k 20k
Frequence Response
+10
+8
+300
+200
+6
+4
VDD=5V
Cin=0.1uF
+2 Rin=150kΩ
RL=4Ω
Po=2.1W
+0
20 100
1k
Frequency (Hz)
+100
+0
-100
-200
-300
-400
10k 50k
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Oct., 2013
5
0.1
0.01
0
VDD=2.4V
VDD=5V
fin=1kHz
Cin=0.1uF
Rin=150kΩ
RL=8Ω
0.4 0.8 1.2 1.6
Output Power (W)
2
2.4
THD+N vs. Frequency
1
Po=0.9W
0.1
Po=0.45W
Po=0.09W
0.01
VDD=5V
Cin=0.1uF
Rin=150kΩ
RL=8Ω
0.001
20 100
1k
Frequency (Hz)
10k 20k
Output Noise Voltage vs.
Frequency
85µ
75µ
Cin=0.1uF
Rin=150kΩ
RL=4Ω
65µ Input Short to GND
A-weighting
VDD=2.4V
VDD=3.6V
55µ
50µ
45µ
20
VDD=5V
VDD=5.5V
100 1k
Frequency (Hz)
10k 20k
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
5 Page 
APA2012
Application Information (Cont.)
Over Current Protection
The APA2012 monitors the output current, and when the
current exceeds the current-limit threshold, the APA2012
turn-off the output stage to prevent the output device from
damages in over-current or short-circuit condition. The IC
will turn-on the output buffer after 100ms, but if the over-
current or short-circuits condition is still remain, it enters
the Over-Current protection again. The situation will cir-
culate until the over-current or short-circuits has be
removed.
Thermal Protection
The over-temperature circuit limits the junction tempera-
ture of the APA2012. When the junction temperature
exceedsT =+170oC, a thermal sensor turns off the output
J
buffer, allowing the devices to cool. The thermal sensor
allows the amplifier to start-up after the junction tempera-
ture down about 150oC. The thermal protection is de-
signed with a 25oC hysterics to lower the average TJ dur-
ing continuous thermal overload conditions, increasing
lifetime of the IC.
Input Resistance, Rin
The gain of the APA2012 has been set by the external
resistors (R ).
in
Gain(Av) = 2X150kΩ
Rin
(1)
For fully differential operating, the R match is very impor-
in
tant for CMRR, PSRR and harmonic distortion
performance. It’s recommended to use 1% tolerance re-
sistor or better. Keeping the input trace as short as pos-
sible to limit the noise injection.
The gain is recommended to set as 2V/V or lower for
APA2012 optimal performance.
Input Capacitor, Cin
In the typical application, an input capacitor, Cin, is required
to allow the amplifier to bias the input signal to the proper
DC level for optimum operation. In this case, C and the
in
minimum input impedance R from a high-pass filter with
in
the corner frequency are determined in the following
equation:
FC(highpass )
=
1
2πRinCin
(2)
The value of C must be considered carefully because it
in
directly affects the low frequency performance of the circuit.
For example, when Rin is 100kΩ and the specification
calls for a flat bass response are down to 40Hz. The
equation is reconfigured as below:
Cin
=
1
2πRinFc
(3)
When input resistance is considered, the Cin is 0.2µF.
Therefoe, a value in the range of 0.22µF to 0.1.0µF would
be chosen. A further consideration for this capacitor is the
leakage path from the input source through the input net-
work (R + R , C ) to the load.
in f in
This leakage current creates a DC offset voltage at the
input to the amplifier that reduces useful headroom, es-
pecially in high gain applications. For this reason, a low-
leakage tantalum or ceramic capacitor is the best choice.
When polarized capacitors are used, the positive side of
the capacitor should face the amplifier input in most appli-
cations because the DC level of the amplifiers’inputs are
held at VDD/2. Please note that it is important to confirm the
capacitor polarity in the application.
Power Supply Decoupling, Cs
The APA2012 is a high-performance CMOS audio ampli-
fier that requires adequate power supply decoupling to
ensure the output total harmonic distortion (THD+N) is
as low as possible. Power supply decoupling also pre-
vents the oscillations being caused by long lead length
between the amplifier and the speaker.
The optimum decoupling is achieved by using two differ-
ent types of capacitors that target on different types of
noise on the power supply leads. For higher frequency
transients, spikes, or digital hash on the line, a good low
equivalent-series-resistance (ESR) ceramic capacitor,
typically 0.1µF, is placed as close as possible to the de-
vice VDD pin for the best operation. For filtering lower
frequency noise signals, a large aluminum electrolytic
capacitor of 10µF or greater is placed near the audio power
amplifier is recommended.
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Oct., 2013
11
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet APA2012.PDF ] | |
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