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PDF EUA6230 Data sheet ( Hoja de datos )
| Número de pieza | EUA6230 | |
| Descripción | Audio Power Amplifier | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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EUA6230
2.4W, Mono Class G
Audio Power Amplifier with AGC
DESCRIPTION
The EUA6230 is a mono Class G power amplifier with an
integrated inverting charge-pump power supply and
automatic gain control (AGC). The charge pump can
supply up to 500mA of peak out-put current over a 2.7V to
5V supply voltage range, guaranteeing up to 2.4W output
power into an 8Ω load. The AGC function can prevent
distortion of the audio signal by detecting output signal
clip due to the over level input signal and compressing it
automatically.
The EUA6230 offers good performance through the class
G output stage, which provides efficiency levels greater
than Class AB devices without the EMI penalties
commonly associated with Class D amplifiers. The device
utilizes fully differential inputs and outputs, comprehensive
click-and-pop suppression, shutdown control, and soft-start
circuitry. The EUA6230 is available in 28-pin TQFN
(4mm× 4mm) package.
FEATURES
2.7V-5.0V Operation
Auto Gain Control for Non-Clipping
61% Efficiency (VCC=5V, POUT=1W)
2.4W Output Power into 8Ω at VCC=5V
Up to 2.4W Instantaneous Output Power into 8Ω
Integrated Charge-Pump Power Supply
Click-and-Pop Suppression
Auto Gain Control for Non-Clipping
Available in TQFN-28 Package
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
Mobile Phones/ Smartphones
Personal Media Players
Tablet PC
Handheld Gaming
Notebook Computers
Typical Application Circuit
DS6230 Ver1.1 Sep. 2011
Figure1.
1
1 page  
EUA6230Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Electrical Characteristics (continued)
(VCC=CPVDD= SHDN =3.6V, GND=CPGND=0V, RIN+=RIN-=10kΩ,RFS=100kΩ, C1=4.7µF, C2=10µF; speaker load
resistors (RL) are terminated between OUT+ and OUT-, unless otherwise stated; TA=TMIN to TMAX, unless otherwise
noted. Typical values are at TA=25°C.)(Notes 1,2)
Symbol
Parameter
Conditions
EUA6230
Min. Typ. Max. Unit
SPEAKER AMPLIFIER
VCC=2.7V to 5.0V
69
PSRR Power-Supply Rejection Ratio f=217Hz, 200mVP-P ripple
64 dB
f=1kHz, 200mVP-P ripple
60
THD+N
Total Harmonic Distortion Plus
Noise
RL=8Ω, VOUT=1kHz/400mW
RL=8Ω, VOUT=1kHz/1W
0.01
%
0.09
SNR Signal-to-Noise Ratio
VOUT=0.5W, inputs to GND by
C1N A-Weighted
89
dB
Noise Output Noise
22Hz to22kHz
A-weighted
102
µVrms
71.7
Note 1:All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 2:Testing performed with resistive and inductive loads to simulate an actual speaker load. For dynamic speakers,
RL= 8Ω, 68µH.
DS6230 Ver1.1 Sep. 2011
5
5 Page 
EUA6230Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Component Selection
Input-Coupling Capacitor
The AC-coupling capacitors (CIN_) and input resistors
(RIN_) form high pass filters that remove any DC bias
from an input signal (see the Typical Application
Circuit/Functional Diagram). CIN_ blocks DC voltages
from the amplifier. The -3dB point of the high pass filter,
assuming zero source impedance due to the input signal
source, is given by:
f −3dB
=
2π
×
R
1
IN _
×
CIN _
(Hz)
Thermal Considerations
Class G amplifiers provide much better efficiency and
thermal performance than a comparable Class AB
amplifier. However, the system’s thermal performance
must be considered with realistic expectations and include
consideration of many parameters. This section examines
Class G amplifiers using general examples to illustrate
good design practices.
Choose CIN so that f-3dB is well below the lowest
frequency of interest. Setting f-3dB too high affects the
amplifier’s low frequency response. Use capacitors with
low-voltage coefficient dielectrics. Aluminum electrolytic,
tantalum, or film dielectric capacitors are good choices for
AC-coupling capacitors. Capacitors with high-voltage
coefficients, such as ceramics, can result in increased
distortion at low frequencies.
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 50mΩ for optimum
performance. Low-ESR ceramic capacitors minimize the
output resistance of the charge pump. For best
performance over the extended temperature range, select
capacitors with an X7R dielectric.
Flying Capacitor (C1)
The value of the flying capacitor (C1) affects the load
regulation and output resistance of the charge pump. A C1
value that is too small degrades the device’s ability to
provide sufficient current drive. Increasing the value of
C1 improves load regulation and reduces the charge-pump
output resistance to an extent. Above 1µF, the
on-resistance of the switches and the ESR of C1 and C2
dominate. A 4.7µF capacitor is recommended.
Hold Capacitor (C2)
The output capacitor value and ESR directly affect the
ripple at PVSS. Increasing C2 reduces output ripple.
Likewise, decreasing the ESR of C2 reduces both ripple
and output resistance. A 10µF capacitor is recommended.
Charge-Pump Frequency Set Resistor (RFS)
The charge pump operates in two modes. When the
charge pump is loaded below 100mA, it operates in as
low mode where the oscillation frequency is reduced to
1/4 of its normal operating frequency. Once loaded, the
charge-pump oscillation frequency returns to normal
operation. In applications where the design may be
sensitive to the operating charge-pump oscillation
frequency, the value of the external resistor RFS can be
changed to adjust the charge-pump oscillation frequency.
DS6230 Ver1.1 Sep. 2011
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet EUA6230.PDF ] | |
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