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PDF LY8662 Data sheet ( Hoja de datos )
| Número de pieza | LY8662 | |
| Descripción | Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function | |
| Fabricantes | Lyontek | |
| Logotipo |  |
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®
Rev. 1.2
LY8662
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
FEATURES
2.5V~5.5V Power supply.
Thermal shutdown Protection.
Low current shutdown mode.
No capacitors and networks or bootstrap
capacitors required.
Low noise during turn-on and turn-off transitions.
User selectable stereo headphone function.
Lead free and green package available.
(RoHS Compliant)
Space Saving Package
-- 16-pin QFN (3*3*0.75 mm) Package
APPLICATION
Portable electronic devices
Portable and desktop computers
Cell Phones
Multimedia Monitors
Audio System
PIN CONFIGURATION
GENERAL DESCRIPTION
The LY8662 is a dual bridge-connected audio power
amplifier. It is capable of driving 4Ω speaker load at
a continuous average output of 2.0W / 10%
distortion (THD+N) from a 5.5V power supply. It
primarily designed for high quality application in
other portable communication device and portable
and desktop computers device.
The audio amplifier features low power consumption
in shutdown mode. And it has an internal thermal
shutdown protection feature.
LY8662 audio amplifier was designed specifically to
provide high quality output power with a minimal
amount of external components. The LY8662 does
not require output capacitors, and it is ideally suited
for other low voltage applications or portable
electronic devices where minimal power
consumption is a primary requirement.
www.DataSheet4U.com
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
1
1 page  
®
Rev. 1.2
LY8662
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
ORDERING INFORMATION
LY 8 662 VV
V : Package Type
EL : 16-Pin QFN 3*3
Product Name
A : Product Line
LY : Lyontek Product Number Prefix
www.DaAtaSBhSeeOt4UL.UcoTmE MAXIMUN RATINGS*
PARAMETER
Supply Voltage
Operating Temperature
Input Voltage
Storage Temperature
Power Dissipation
ESD Susceptibility
Junction Temperature
Soldering Information
SYMBOL
VDD
TA
VI
TSTG
PD
VESD
TJMAX
Vapor Phase (60 sec.)
Infrared (15 sec.)
RATING
6.0
-40 to 85 (I grade)
-0.3V to VDD +0.3V
-65 to 150
Internally Limited
2000
150
215
220
UNIT
V
℃
V
℃
W
V
℃
℃
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
5
5 Page 
®
Rev. 1.2
LY8662
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
Bypass Capacitor Value Selection
Besides minimizing the input capacitor size, careful consideration should be paid to value of C4, the capacitor
connected to the BYPASS pin. Since C4 determines how fast the LY8662 settles to quiescent operation, its
value is critical when minimizing turn-on pops. The slower the LY8662’s outputs ramp to their quiescent DC
voltage (nominally 1/2 VDD), the smaller the turn-on pop. Choosing C4 equal to 1.0 μF along with a small
value of C2,C3 (in the range of 0.1 μF to 0.39 μF), produces a click-less and pop-less shutdown function. As
discussed above, choosing C1 no larger than necessary for the desired bandwith helps minimize clicks
and pops. Connecting a 1μF capacitor, C4, between the BYPASS pin and ground improves the internal bias
voltage’s stability and improves the amplifier’s PSRR.
OPTIMIZING CLICK AND POP REDUCTION PERFORMANCE
The LY8662 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. When the part is turned on, 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 C4 alters the device’s turn-on time and the magnitude of
“clicks and pops”. Increasing the value of C4 reduces the magnitude of turn-on pops. However, this presents
a tradeoff: as the size of C4 increases, the turn-on time increases. There is a linear relationship between the
size of C4 and the turn-on time. Here are some typical turn-on times for various values of C4:
In order eliminate “clicks and pops”, all capacitors must be discharged before turn-on. Rapidly switching VDD
on and off may not allow the capacitors to fully discharge, which may cause “clicks and pops”.
TABLE 2. C4 and TON Truth Table
C4 TON (Typ.) at 5.0V
1.0uF
172 ms
0.47uF
76 ms
0.33uF
60 ms
0.22uF
50 ms
0.1uF
36 ms
www.DataSheet4U.com
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LY8662.PDF ] | |
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