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PDF EMA2203-50QE20NRR Data sheet ( Hoja de datos )
| Número de pieza | EMA2203-50QE20NRR | |
| Descripción | Stereo 2.4W Audio Power Amplifier | |
| Fabricantes | Elite Semiconductor | |
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ESMT/EMP
EMA2203
Stereo 2.4W Audio Power Amplifier with DC
Volume Control and Headphone
GENERAL DESCRIPTION
The EMA2203 is a monolithic integrated circuit that
provides DC volume control, and stereo bridged audio
power amplifiers capable of producing 2W into 4Ω or
2.4W into 3Ω with less than 1.0% THD+N.
The EMA2203 incorporates a DC volume control, stereo
bridged audio power amplifiers making it optimally
suited for multimedia monitors, portable radios, desktop,
and portable computer applications. The EMA2203
features an low-power consumption shutdown mode,
and both power amplifier and headphone..
Advanced pop & click circuitry is built in to eliminate
noises that would otherwise occur during turn-on and
turn-off transitions.
KEY SPECIFICATION
． BTL mode PO at 5V, f=1kHz, 1% THD+N
2.4W (typ) into 3Ω
2.0W (typ) into 4Ω
1.1W (typ) into 8Ω
． BTL mode PO at 5V, f=1kHz, 10% THD+N
3W (typ) into 3Ω
． Single-ended mode PO at 5V, f=1kHz, 1% THD+N
85mW (typ) into 32Ω
． Shutdown current 0.1µA (typ)
FEATURES
． 32 steps DC Volume Control
． Stereo switchable bridged/single-ended power
amplifiers
． “Click and pop” suppression circuitry
． Thermal shutdown protection circuitry
APPLICATIONS
． Portable and Desktop Computers
． Multimedia Monitors
． Portable Radios, PDAs, and Portable TVs
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date : Jun. 2009
Revision : 2.0
1/17
1 page  
ESMT/EMP
TYPICAL APPLICATION CIRCUIT
EMA2203
Figure1. Typical Audio Power Amplifier Application Circuit
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date : Jun. 2009
Revision : 2.0
5/17
5 Page 
ESMT/EMP
EMA2203
capacitor’s size. Higher value capacitors need more time to reach a quiescent DC voltage (usually VDD/2) when
charged with a fixed current. The amplifier’s output charges the input capacitor through the feedback resistor, Rf. Thus,
pops can be minimized by selecting an input capacitor value that is no higher than necessary to meet the desired
−3dB frequency.
A shown in Figure 1, the input resistor (20kΩ) and the input capacitor produce a −3dB high pass filter cutoff frequency
that is found using Equation (1).
f− 3dB
=
1
2 π RIN C1
(1)
As an example when using a speaker with a low frequency limit of 150Hz, the input coupling capacitor, using Equation
(1), is 0.063μF. The 0.33μF input coupling capacitor shown in Figure 1 allows the EMA2203 to drive high efficiency, full
range speaker whose response extends below 30Hz.
OPTIMIZING CLICK AND POP REDUCTION PERFORMANCE
The EMA2203 contains circuitry that minimizes turn-on and shutdown transients or “clicks and pop”. For this discussion,
turn-on refers to either applying the power supply voltage or when the shutdown mode is deactivated. While the
power supply is ramping to its final value, the EMA2203’s internal amplifiers are configured as unity gain buffers. An
internal current source changes the voltage of the BYPASS pin in a controlled, linear manner. Ideally, the input and
outputs track the voltage applied to the BYPASS pin. The gain of the internal amplifiers remains unity until the voltage
on the bypass pin reaches 1/2 VDD. As soon as the voltage on the bypass pin is stable, the device becomes fully
operational. Although the BYPASS pin current cannot be modified, changing the size of CBypass alters the device’s
turn-on time and the magnitude of “clicks and pops”. Increasing the value of CBypass reduces the magnitude of turn-on
pops. However, this presents a tradeoff: as the size of CBypass increases, the turn-on time increases. There is a linear
relationship between the size of CBypass and the turn-on time. Here are some typical turn-on times for various values of
CBypass:
CB
0.1 μF
0.22 μF
0.47 μF
1.0 μF
TON
30 ms
60 ms
150 ms
300 ms
In order eliminate “clicks and pops”, all capacitors must be discharged before turn-on. Rapidly switching VDD may not
allow the capacitors to fully discharge, which may cause “clicks and pops”. In a single-ended configuration, the
output is coupled to the load by COUT. This capacitor usually has a high value. COUT discharges through internal switch.
Depending on the size of COUT, the discharge time constant can be relatively large. To reduce transients in
single-ended mode, an external 1kΩ–5kΩ resistor RPULL can be placed in parallel with the load resistor. For EMA2203
operating in single-ended mode, turn-on time is typical 800ms with 1.0 μF BYPASS capacitor to reach good “clicks
and pops” elimination performance.
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date : Jun. 2009
Revision : 2.0
11/17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet EMA2203-50QE20NRR.PDF ] | |
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