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PDF ( 数据手册 , 数据表 ) EUA2313

零件编号 EUA2313
描述 6-W Stereo Class-D Audio Power Amplifier
制造商 Eutech Microelectronics
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EUA2313 数据手册, 描述, 功能
EUA2313
6-W Stereo Class-D Audio Power
Amplifier with Speaker Protection
DESCRIPTION
The EUA2313 is a high efficiency, 2 channel bridged-tied
load (BTL), class-D audio power amplifier. Operating from
a 10V power supply, EUA2313 is capable of delivering
6W/ channel of continuous output power to a 8load with
10% THD+N. The EUA2313 features a differential input
architecture offering improved noise immunity over a
single-ended (SE) input amplifier. Amplifier gain is
internally configured and can be selected to 20, 26, 32 or
36dB utilizing the G0 and G1 gain select pins. Advanced
EMI suppression technology enables the use of
inexpensive ferrite bead at the outputs while meeting EMC
requirements.
The speaker protection circuitry is integrated into
EUA2313 to limit the amount of current through the
speaker. Meanwhile, the AGC detects output signal clip
due to the over level input signal and suppresses it
automatically. The EUA2313 also features short-circuit and
thermal protection preventing the device from being
damaged during a fault condition. The EUA2313 is
available in thermally efficient 28-pin TSSOP package.
FEATURES
Wide Supply Voltage: 8V to 26V
Unique Modulation Scheme Reduces EMI Emission
6-W/ch into an 8-Load From a 10-V Supply
12W into a 4-Mono Load From a 10-V Supply
87% Efficient Class-D Operation Eliminates
Need for Heat Sinks
Four Selectable, Gain Settings
Differential Inputs
Speaker Protection Circuitry
Auto Gain Control
Thermal and Short-Circuit Protection
28-pin TSSOP Package with Thermal Pad
RoHS compliant and 100% lead(Pb)-free
Halogen-Free
APPLICATIONS
Televisions
Typical Application Circuit
DS2313 Ver1.1 May 2012
Figure1. Simplified Application Schematic
1







EUA2313 pdf, 数据表
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
EUA2313
Figure9.
Figure11.
Figure10.
Figure12.
Figure13.
DS2313 Ver1.1 May 2012
8
Figure14.







EUA2313 equivalent, schematic
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
EUA2313
This feature protects the speaker from large DC currents
or AC currents less than 2Hz. To avoid nuisance faults
due to the DC detect circuit, hold the SD pin low at
power-up until the signals at the inputs are stable. Also,
take care to match the impedance seen at the positive and
negative inputs to avoid nuisance DC detect faults.
PBTL Select
EUA2313 offers the feature of parallel BTL operation
with two outputs of each channel connected directly. If
the PBTL pin (pin 14) is tied high, the positive and
negative outputs of each channel (left and right) are
synchronized and in phase. To operate in this PBTL
(mono) mode, apply the input signal to the RIGHT input
and place the speaker between the LEFT and RIGHT
outputs. Connect the positive and negative output together
for best efficiency. For an example of the PBTL
connection, see the schematic in the APPLICATION
INFORMATION section.
For normal BTL operation, connect the PBTL pin to local
ground.
The -3dB frequency can be calculated using Equation 2.
Use the ZI values given in Table 1.
f= 1
2πZiCi
---------------- (2)
Input Capacitor, CI
In the typical application, an input capacitor (CI) is
required to allow the amplifier to bias the input signal to
the proper dc level for optimum operation. In this case, CI
and the input impedance of the amplifier (ZI) form a
high-pass filter with the corner frequency determined in
Equation 3.
Short-Circuit Protection and Automatic Recovery
Feature
The EUA2313 has short-circuit protection circuitry on the
outputs that prevents damage to the device during
output-to-output shorts, output-to-GND shorts, and
output-to-VCC shorts. When a short circuit is detected on
the outputs, the part disables the output drive. A latched
fault flag is resulted. The EUA2313 can automatic recover
for normal operation if short was removed. If the short
was not removed, the protection circuitry again activates.
Thermal Protection
fc
=
1
2πZiCi
-----------------(3)
The value of CI is important, as it directly affects the bass
(low-frequency) performance of the circuit. Consider the
example where ZI is 50 kand the specification calls for
a flat bass response down to 20 Hz. Equation 3 is
reconfigured as Equation 4.
Ci
=
1
2πZifc
-----------------(4)
Thermal protection on the EUA2313 prevents damage to
the device when the internal die temperature exceeds
150oC. There is a 10oC tolerance on this trip point from
device to device. Once the die temperature exceeds the
thermal set point, the device enters into the shutdown
state and the outputs are disabled. This is not a latched
fault. The thermal fault is cleared once the temperature of
the die is reduced by 30oC. The device begins normal
operation at this point with no external system interaction.
Input Resistance
Changing the gain setting can vary the input resistance of
the amplifier from its smallest value, 50 k±20%, to the
largest value, 100 k±20%. As a result, if a single
capacitor is used in the input high-pass filter, the -3 dB or
cutoff frequency may change when changing gain steps.
In this example, CI is 0.16µF; so, one would likely choose
a value of 0.22µF as this value is commonly used. If the
gain is known and is constant, use ZI from Table 1 to
calculate CI.
Power Supply Decoupling, CS
The EUA2313 is a high-performance CMOS audio
amplifier that requires adequate power supply decoupling
to ensure that the output total harmonic distortion (THD)
is as low as possible. Power supply decoupling also
prevents oscillations for long lead lengths between the
amplifier and the speaker. The optimum decoupling is
achieved by using two capacitors of different types that
target 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 to 1µF placed as close
as possible to the device VCC lead works best. For
filtering lower frequency noise signals, a larger aluminum
electrolytic capacitor of 220µF or greater placed near the
audio power amplifier is recommended. The 220µF
capacitor also serves as local storage capacitor for
supplying current during large signal transients on the
DS2313 Ver1.1 May 2012
16










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