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PDF EUA4992JIR1 Data sheet ( Hoja de datos )
| Número de pieza | EUA4992JIR1 | |
| Descripción | 2.25W Stereo Audio Power Amplifier | |
| Fabricantes | Eutech Microelectronics | |
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EUA4992/4992A
2.25W Stereo Audio Power Amplifier
DESCRIPTION
The EUA4992/4992A are dual bridge-connected audio
power amplifiers, capable of delivering 1.25W of
continuous average power to an 8Ω BTL with less than 1%
distortion (THD+N) from a 5.0V power supply, and
540mW to an 8Ω BTL load from a 3.3V power supply.
The EUA4992/4992A provide high quality audio while
requiring few external components and minimal power
consumption. They feature a low-power shutdown mode,
which is achieved by driving the SHUTDOWN pin with
logic low.
The EUA4992/4992A contain circuitry to prevent
from ”pop and click” noise that would otherwise occur
during turn-on and turn-off transitions.
For maximum flexibility, the EUA4992/4992A provide an
externally controlled gain (with resistors), as well as an
externally controlled turn-on and turn-off times (with the
bypass capacitor).
The EUA4992/4992A are available in a 16-pin TQFN
package.
Typical Application Circuit
FEATURES
z Output Power at 10% THD+N, VDD=5V
-- 2.25W/CH (typ) into a 4Ω Load
-- 1.54W/CH (typ) into a 8Ω Load
z Output Power at 1% THD+N, VDD=5V
-- 1.9W/CH (typ) into a 4Ω Load
-- 1.25W/CH (typ) into a 8Ω Load
z Output Power at 1% THD+N, VDD=3.3V
-- 0.75W/CH (typ) into a 4Ω Load
-- 0.54W/CH (typ) into a 8Ω Load
z Shutdown Current 0.06µA (typ)
z Supply Voltage Range 2.5V to 5.5V
z “Click and Pop” Suppression
z Thermal Shutdown Protection Circuitry
z Available in 3mm 3mm TQFN-16 (EUA4992)
and 4mm 4mm TQFN-16 (EUA4992A) Packages
z RoHS compliant and 100% lead(Pb)-free
APPLICATIONS
z Cell Phones
z Portable and Desktop Computers
z Portable Audio System
z Multimedia Monitors
DS4992/4992A Ver1.0 Mar. 2009
Figure 1.
1
1 page  
EUA4992/4992A
Electrical Characteristics (3.3V)
The following specifications apply for VDD=3.3V unless otherwise noted. Limits apply for TA=+25°C.
Symbol
Parameter
Conditions
EUA4992/4992A
Min Typ Max.
IDD
Quiescent Power Supply
Current
VIN=0V,IO=0A
3.8
Unit
mA
ISD Shutdown Current
VIH
Shutdown Input Voltage
High
VIL Shutdown Input Voltage
TWU TLurn on time
VOS Output Offset Voltage
GND applied to the shutdown pin
1µF bypass cap (C4)
VIN=0V
0.02 µA
0.9 V
0.8 V
105 ms
5 mV
THD+N=1%, f=1KHz RL=4Ω (Note 1) 0.75 W
PO Output Power
THD+N=1%, f=1KHz RL=8Ω
THD+N=10%, f=1KHz RL=4Ω (Note 1)
0.54
0.93
W
W
THD+N
Total Harmonic Distortion +
Noise
PSRR
Power Supply Rejection
Ratio
Xtalk Channel separation
THD+N=10%, f=1KHz RL=8Ω
1KHz, Avd=2 RL=8Ω,Po=0.25W
Input grounded f=217Hz Vripple=200m
Vp-p C4=1µF, RL=8Ω
Input grounded f=1KHz Vripple=200m
Vp-p C4=1µF, RL=8Ω
Input unterminated f=217Hz
Vripple=200m Vp-p C4=1µF, RL=8Ω
Input unterminated f=1KHz
Vripple=200m Vp-p C4=1µF, RL=8Ω
f=1KHz, C4=1µF
0.64
0.076
51
64
76
70
95
W
%
dB
dB
VNO Output noise voltage
1KHz
11 uVrms
Note 1. The thermal performance of the QFN package when used with the exposed-DAP connected to a thermal plane is
sufficient for driving 4Ω loads.
DS4992/4992A Ver1.0 Mar. 2009
5
5 Page 
EUA4992/4992A
Application Information
Bridged Configuration Explanation
As shown in Figure 1, the EUA4992/4992A consists of two
pairs of operational amplifiers, forming a two-channel
(channel A and channel B) stereo amplifier. (Though the
following discusses channel A, it applies equally to channel
B.) External resistors Rf and Ri set the closed-loop gain of
Amp1A, whereas two internal 20kΩ resistors set Amp2A’s
gain at -1. The EUA4992/4992A drives a load, such as a
speaker, connected between the two amplifier outputs,
-OUTA and +OUTA.
Figure 1 shows that Amp1A’s output serves as Amp2A’s
input. This results in both amplifiers producing signals
identical in magnitude, but 180° out of phase. Taking
advantage of this phase difference, a load is placed
between –OUTA and +OUTA and driven differentially
(commonly referred to as "bridge mode"). This results in a
differential gain of
( )A VD = 2 × R f / R i
(1)
Bridge mode amplifiers are different from single-ended
amplifiers that drive loads connected between a single
amplifier’s output and ground. For a given supply voltage,
bridge mode has a distinct advantage over the single-ended
configuration: its differential output doubles the voltage
swing across the load. This produces four times the output
power when compared to a single-ended amplifier under the
same conditions. This increase in attainable output power
assumes that the amplifier is not current limited or that the
output signal is not clipped. To ensure minimum output
signal clipping when choosing an amplifier’s closed-loop
gain, refer to the Audio Power Amplifier Design section.
Another advantage of the differential bridge output is no net
DC voltage across the load. This is accomplished by biasing
channel A’s and channel B’s outputs at half-supply. This
eliminates the coupling capacitor that single supply, single
ended amplifiers require. Eliminating an output coupling
capacitor in a single-ended configuration forces a
single-supply amplifier’s half-supply bias voltage across the
load. This increases internal IC power dissipation and may
permanently damage loads such as speakers.
Power Supply Bypassing
As with any power amplifier, proper supply bypassing is
critical for low noise performance and high power supply
rejection. Applications that employ a 5V regulator
typically use a 10µF in parallel with a 0.1µF filter
capacitors to stabilize the regulator’s output, reduce noise
on the supply line, and improve the supply’s transient
response. However, their presence does not eliminate the
need for a local 1.0µF tantalum bypass capacitance
connected between the EUA4992/4992A’s supply pins
and ground. Do not substitute a ceramic capacitor for the
tantalum. Doing so may cause oscillation in the output
signal. Keep the length of leads and traces that connect
capacitors between the EUA4992/4992A’s power supply
pin and ground as short as possible. Connecting a 1µF
capacitor, CB, between the BYPASS pin and ground
improves the internal bias voltage’s stability and improves
the amplifier’s PSRR. The PSRR improvements increase
as the bypass pin capacitor value increases. Too large,
however, increases turn-on time and can compromise
amplifier’s click and pop performance. The selection of
bypass capacitor values, especially CB, depends on
desired PSRR requirements, click and pop performance
(as explained in the section, Proper Selection of
External Components), system cost, and size constraints.
Micro-Power Shutdown
The voltage applied to the SHUTDOWN pin controls the
EUA4992/4992A’s shutdown function. Activate
micro-power shutdown by applying VDD to the
SHUTDOWN pin. When active, the EUA4992/4992A’s
micro-power shutdown feature turns off the amplifier’s
bias circuitry, reducing the supply current.
There are a few ways to control the micro-power
shutdown. These include using a single-pole, single-throw
switch, a microprocessor, or a microcontroller. When
using a switch, connect an external 10kΩ pull-up resistor
between the SHUTDOWN pin and VDD. Connect the
switch between the SHUTDOWN pin and ground. Select
normal amplifier operation by closing the switch.
Opening the switch connects the SHUTDOWN pin to
VDD through the pull-up resistor, disable micro-power
shutdown. The switch and resistor guarantee that the
SHUTDOWN pin will not float. This prevents unwanted
state changes. In a system with a microprocessor or a
microcontroller, use a digital output to apply the control
voltage to the SHUTDOWN pin. Driving the
SHUTDOWN pin with active circuitry eliminates the pull
up resistor.
Table 1. Logic Level Truth Table for
Shutdown Operation
SHUTDOWN
OPERATIONAL MODE
High
Full power, stereo BTL amplifiers
Low Micro-power Shutdown
Selecting Proper External Components
Optimizing the EUA4992/4992A’s performance requires
properly selecting external components. Though the
EUA4992/4992A operates well when using external
components with wide tolerances, best performance is
achieved by optimizing component values.
The EUA4992/4992A is unity-gain stable, giving a
designer maximum design flexibility. The gain should be
set to no more than a given application requires. This
allows the amplifier to achieve minimum THD+N and
maximum signal-to-noise ratio. These parameters are
compromised as the closed-loop gain increases. However,
low gain demands input signals with greater voltage
swings to achieve maximum output power. Fortunately,
many signal sources such as audio CODECs have outputs
DS4992/4992A Ver1.0 Mar. 2009
11
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