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PDF EUA2510A Data sheet ( Hoja de datos )
| Número de pieza | EUA2510A | |
| Descripción | Low EMI 2.7W Boosted Class-D Audio Power Amplifier | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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EUA2510A
Low EMI 2.7W Boosted Class-D
Audio Power Amplifier
DESCRIPTION
The EUA2510A integrates a current-mode boost converter
with a high efficiency mono, Class D audio power amplifier
to provide 2.7W/10% THD or 2W/1% THD continuous
power into a 4Ω speaker when operating on a 3.3V power
supply with boost voltage (PV1) of 5V. The Class D
amplifier is a low noise, filterless PWM architecture that
eliminates the output filter, reducing external component
count, board area consumption, system cost, and simplifying
design.
The EUA2510A’s boost converter, operating at a fixed
frequency of 600KHz, generates a high voltage rail which is
used to supply the Class-D amplifier. The EUA2510A
features a low-power consumption shutdown mode.
Shutdown may be enabled by driving the Shutdown pin to a
logic low (GND).
The gain of the Class D is externally configurable which
allows independent gain control from multiple sources by
summing the signals. Output short circuit and Thermal
shutdown protection prevent the device from damage during
fault conditions. Superior click and pop suppression
eliminates audible transients during power-up and shutdown.
FEATURES
z 2.7W/10% THD into a 4Ω Load with a 3.3V Supply
z Fully Differential Inputs
z Externally Configurable Gain on Class D
z 2.7V - 5V operation (VDD)
z Independent Boost and Amplifier Shutdown Pins
z 0.5µA Shutdown Current
z Integrated Pop and Click Suppression Circuitry
z 3mm × 4mm TDFN-14 Package
z RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
z Mobile Phones
z GPS
z Portable Media
z Handheld Games
Typical Application Circuit
DS2510A Ver1.0 Apr. 2010
Figure1.
1
1 page  
EUA2510ATel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Electrical Characteristics VDD=3.3V
The following specifications apply for VDD =3.3V,PV1=5V,AV=6dB (Ri=150kΩ), RL=15µH+8Ω+15µH ,fIN=1kHz,
unless otherwise specified. Limits apply for TA=25°C.
Symbol
Parameter
Conditions
EUA2510A
Min. Typ. Max.
Unit
AV Gain
300 kΩ /Ri
V/V
VRIPPLE=200mVP-P Sine
f=RIPPLE=217Hz
-75.4
dB
PSRR
Power Supply Rejection Ratio VRIPPLE=200mVP-P Sine
f=RIPPLE=1Hz
VRIPPLE=200mVP-P Sine
f=RIPPLE=10Hz
-68 dB
-51 dB
CMRR
Common Mode Rejection
Ratio
VRIPPLE=200mVP-P, f=RIPPLE=217Hz
-52 dB
η Efficiency
PO=1W, f=1kHz, RL=15µH+8Ω+15µH
VDD=3.3V
77
%
VFB FB Regulation Voltage
Boost Converter Switching
Frequency
Class D Switching Frequency
1.20 1.25 1.30 V
450 600 750 kHz
200 250 300 kHz
UVLO Under Voltage Lockout
2.2 2.4 2.6 V
IOL Output Current Limit
1700 2200 2700 mA
DS2510A Ver1.0 Apr. 2010
5
5 Page 
EUA2510ATel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Application Information
Fully Differential Amplifier
The EUA2510A integrates a boost converter with a high
efficiency mono, class-D audio power amplifier. The fully
differential amplifier consists of a differential amplifier
and a common-mode amplifier. The differential amplifier
ensures that the amplifier outputs a differential voltage on
the output that is equal to the differential input times the
gain. The common-mode feedback ensures that the
common-mode voltage at the output is biased around
VDD/2 regardless of the common-mode voltage at the
input. The fully differential class-D can still be used with
a single-ended input; however, the class-D should be used
with differential inputs when in a noisy environment, like
a wireless handset, to ensure maximum noise rejection.
Operating Ratings
The boost converter takes a low supply voltage (VDD),
and increase it to a higher output voltage (PV1). PV1 is
the power supply for the Class D amplifier. The Class D
amplifier operating rating is 2.5V≤(PV1)≤5.5V when
being used without the Boost. Note the output voltage
(PV1) has to be more than VDD.
Setting the Boost
Output Voltage
An external feedback resistor divider is required to divide
the output voltage down to the nominal 1.25V reference
voltage. The current drawn by the resistor network should
be limited to maintain the overall converter efficiency.
The maximum value of the resistor network is limited by
the feedback input bias current and the potential for noise
being coupled into the feedback pin. Selecting R2 in the
range of 10kΩ to 50 kΩ. The boost converter output
voltage s determined by the relationship:
R
V = V × 1 + 1
OUT FB R 2
The nominal VFB voltage is 1.25V
Inductor Selection
The inductor selection determines the output ripple
voltage, transient response, output current capability, and
efficiency. Its selection depends on the input voltage,
output voltage, switching frequency, and maximum output
current. For most applications, a 4.7µH inductor is
recommended for 600KHz.The inductor maximum DC
current specification must be greater than the peak
inductor current required by the regulator. The peak
inductor current can be calculated:
I ×V
V × (V
−V )
I
= OUT OUT + 1/2 × IN
OUT IN
L(PEAK)
V
L × V × FREQ
IN OUT
Output Capacitor
Low ESR capacitors should be used to minimized the
output voltage ripple. Multilayer ceramic capacitors (X5R
and X7R) are preferred for the output capacitors because
of their lower ESR and small packages. Tantalum
capacitors with higher ESR can also be used. The output
ripple can be calculated as:
I ×D
∆V = OUT + I × ESR
O F ×C
OUT
SW O
Choose an output capacitor to satisfy the output ripple and
load transient requirement. A 4.7µF to 10µF ceramic
capacitor is suitable for most application.
Schottky Diode
In selecting the Schottky diode, the reverse break down
voltage, forward current and forward voltage drop must
be considered for optimum converter performance. The
diode must be rated to handle 2A, the current limit of the
EUA2510A. The breakdown voltage must exceed the
maximum output voltage. Low forward voltage drop, low
leakage current, and fast reverse recovery will help the
converter to achieve the maximum efficiency.
Selecting Input Capacitor (CS1) for Boost
Converter
An input capacitor is required to serve as an energy
reservoir for the current which must flow into the coil
each time the switch turns ON. This capacitor must have
extremely low ESR, so ceramic is the best choice. A
nominal value of 4.7µF is recommended, but larger values
can be used. Since this capacitor reduces the amount of
voltage ripple seen at the input pin, it also reduces the
amount of EMI passed back along that line to other
circuitry.
Maximum Output Current
The output current capability of the EUA2510A is a
function of current limit, input voltage, operating
frequency, and inductor value. The output current
capability is governed by the following equation:
( )I
L
=
I
L - AVG
+
1/
2 × ∆IL
Where:
IL=MOSET current limit
IL - AVG =average inductor current
∆IL =inductor ripple current
∆I L
=
VIN
×
VO
+
VDIODE
−
VIN
−
L × VO + VDIODE × FS
VIN
DS2510A Ver1.0 Apr. 2010
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet EUA2510A.PDF ] | |
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