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PDF ( 数据手册 , 数据表 ) EUA2107

零件编号 EUA2107
描述 6.5-W Mono Class-D Audio Power Amplifier
制造商 Eutech Microelectronics
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EUA2107 数据手册, 描述, 功能
EUA2107
6.5-W Mono Class-D
Audio Power Amplifier
DESCRIPTION
The EUA2107 is a high efficiency, mono bridged-tied load
(BTL), class-D audio power amplifier. Operating from a
12V power supply, EUA2107 is capable of delivering
6.5W of continuous output power to a 8load with 10%
THD+N. The EUA2107 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 12, 18, 23.6 or
35.5dB utilizing the Go and G1 gain select pins.
The EUA2107 also features short-circuit and thermal
protection preventing the device from being damaged
during a fault condition. The EUA2107 is available in
thermally efficient 24-pin TSSOP package and does not
require an external heat sink.
Typical Application Circuit
FEATURES
z Wide Supply Voltage: 8V to 24V
z Unique Modulation Scheme Reduces EMI Emission
z 6.5W into 8Load From 12V Supply (10% THD+N)
z Short circuit Protection (Save two Schottky Diodes.)
z Low Supply Current….8mA Typ at 12V
z Shutdown Current…...1µA Typ
z 24-pin TSSOP Package with Thermal Pad
z RoHS compliant and 100% lead(Pb)-free
APPLICATIONS
z 2.1 Notebook PCs
z LCD Monitors/TVs
z PC Surround Speakers
z Hands-Free Car Kits
DS2107 Ver 1.0 June 2009
Figure1.
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EUA2107 pdf, 数据表
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
EUA2107
Application Information
Gain Selection
The gain of the EUA2107 is set by two input terminals,
GAIN0 and GAIN1.
The gains listed in Table 1 are realized by changing the
taps on the input resistors inside the amplifier. This
causes the input impedance (ZI) to be dependent on the
gain setting. The actual gain settings are controlled by
ratios of resistors, so the gain variation from part-to-part
is small. However, the input impedance may shift by
30% due to shifts in the actual resistance of the input
resistors.
For design purposes, the input network (discussed in the
next section) should be designed assuming an input
impedance of 35 k, which is the absolute minimum
input impedance of the EUA2107. At the lower gain
settings, the input impedance could increase as high as
260 k.
Table.1 Gain Setting
short was removed. If the short was not removed, the
protection circuitry again activates.
Thermal Protection
Thermal protection on the EUA2107 prevents damage to
the device when the internal die temperature exceeds
150°C. There is a ±15°C 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 40°C. The device begins normal
operation at this point with no external system
interaction.
Input Resistance
Each gain setting is achieved by varying the input
resistance of the amplifier, which can range from its
smallest value to over six times that value. As a result, if
a single capacitor is used in the input high-pass filter, the
-3 B or cutoff frequency also changes by over six times.
AMPLIFIER
INPUT
GAIN1 GAIN0 GAIN (dB) IMPEDANCE (k)
TYP
TYP
00
12
200
01
18
100
10
24
100
11
36
50
SHUTDOWN Operation
The EUA2107 employs a shutdown mode of operation
designed to reduce supply current (ICC) to the absolute
minimum level during periods of non-use for
battery-power conservation. The SHUTDOWN input
terminal should be held high during normal operation
when the amplifier is in use. Pulling SHUTDOWN
low causes the outputs to mute and the amplifier to enter
a low-current state, ICC(SD) = 1µA. SHUTDOWN
should never be left unconnected, because amplifier
operation would be unpredictable. Ideally, the device
should be held in shutdown when the system powers up
and brought out of shutdown once any digital circuitry
has settled. However, if SHUTDOWN is to be left
unused, the terminal may be connected directly to VCC.
Short-Circuit Protection
The -3 dB frequency can be calculated using Equation 1.
Use Table 1 for ZI values.
f= 1
2πZiCi
---------------- (1)
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 2.
The EUA2107 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 immediately disables the output
drive and enters into shutdown mode. This is a latched
fault and must be reset by cycling the voltage on the
fc
=
1
2πZiCi
-----------------(2)
SHUTDOWN pin to a logic low and back to the logic
high state for normal operation. This clears the
short-circuit flag and allow for normal operation if the
The value of CI is important, as it directly affects the
bass (low-frequency) performance of the circuit.
Consider the example where ZI is 35 kand the
DS2107 Ver 1.0 June 2009
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