Lyontek LY8661EL Dual 2.0w/ch stereo audio amplifier include headphone function Datasheet

®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
FEATURES
GENERAL DESCRIPTION
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.
„ User selectable shutdown high or low logic
level. (SOP package only)
„ Lead free and green package available.
(RoHS Compliant)
„ Space Saving Package
-- 16-pin QFN 3*3 Package.
-- 16-pin QFN 4*4 Package.
-- 16-pin SOP Package.
The LY8661 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. Shutdown may be enabled by
either logic high or low depending on mode
selection(SOP package only). And it has an internal
thermal shutdown protection feature.
LY8661 audio amplifier was designed specifically to
provide high quality output power with a minimal
amount of external components. The LY8661 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.
„
„
„
„
APPLICATION
„
„
„
„
„
Portable electronic devices
Portable and desktop computers
Cell Phones
Multimedia Monitors
Audio System
PIN CONFIGURATION
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
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FAX: 886-3-6668836
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
PIN DESCRIPTION
SYMBOL
Pin No.
DESCRIPTION
QFN
SOP
1
6
2/11
12/16
-OUTA
3
11
Negative BTL output of A channel.
INA
4
10
Input of A channel.
GND
5/6/7/13/16
2/5
Ground.
INB
8
13
Input of B channel.
BYPASS
9
14
Bypass capacitor which provides the common mode voltage.
-OUTB
10
15
Negative BTL output of B channel.
+OUTB
HP Sense
(Option)
SHUTDOWN
12
1
14
3
15
4
Positive BTL output of B channel.
Headphone sense pin option.
(If None headphone function must connect to GND).
Shutdown the device pin.
SD Mode
--
7
Shutdown Mode Selectable.
NC
--
8/9
+OUTA
VDD
Positive BTL output of A channel.
Power supply.
No connection.
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5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
2
FAX: 886-3-6668836
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
APPLICATION CIRCUIT
Figure 1. Without Headphone Typical Application Circuit (QFN16)
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
3
FAX: 886-3-6668836
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
Figure 2. With Headphone Typical Application Circuit (QFN16)
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
4
FAX: 886-3-6668836
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
Figure 3. Without Headphone Typical Application Circuit (SOP16)
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
5
FAX: 886-3-6668836
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
Figure 4. With Headphone Typical Application Circuit (SOP16)
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
6
FAX: 886-3-6668836
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
ORDERING INFORMATION
LY 8 661 VV
V : Package Type
EB : 16-Pin QFN 3*3
EL : 16-Pin QFN 4*4
SL : 16-Pin SOP
Product Name
A : Product Line
LY : Lyontek Product Number Prefix
ABSOLUTE 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
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
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FAX: 886-3-6668836
UNIT
V
℃
V
℃
W
V
℃
℃
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
DC ELECTRICAL CHARACTERISTICS (VDD=5.0V, TA=25℃)
SYMBOL
TEST CONDITION
IDD
VDD=5.0V, 8Ω Load (BTL)
VSHUTDOWN = 0V,
ISD
HP sense= GND
PARAMETER
Power Supply Current
Shutdown Current
Shutdown, Headphone
High Input Voltage
Shutdown, Headphone
Low Input Voltage
Wake-up time
Output Offset Voltage
Sense
Sense
MIN.
-
TYP.
12.0
MAX.
21.5
UNIT
mA
-
0.1
1.0
µA
VSDIH
1.4
-
-
V
VSDIL
-
-
0.4
V
-
172
7.0
50.0
ms
mV
-
1.1
-
-
1.4
-
-
1.4
-
-
1.8
-
-
2.0
-
-
90
-
-
165
-
-
0.11
-
%
-
62 (f =
217Hz)
66 (f =
1kHz)
-
dB
-
37.5
-
-
15
-
150
-
170
1.0
190
-
TWU
VOS
Bypass cap.=1.0uF
THD+N = 1%, f = 1 kHz,
RL=8Ω
THD+N = 10%, f = 1 kHz
RL=8Ω
THD+N = 1%, f = 1 kHz
RL=4Ω
THD+N = 10%, f = 1 kHz
Output Power
Po
RL=4Ω
THD+N = 10%, f = 1 kHz
RL=4Ω (at 5.5V)
THD+N = 0.1%, f = 1 kHz,
RL=32Ω (SE Mode)
THD+N = 0.1%, f = 1 kHz,
RL=16Ω (SE Mode)
Po = 0.4 Wrms; f = 1kHz,
Total Harmonic Distortion+ Noise THD+N
RL=8Ω
Vripple = 200mV sine p-p
Input terminated with 10Ω
Power Supply Rejection Ratio
PSRR
to GND
Output voltage noise
Thermal Shutdown Temperature
Shutdown Time
Vn
TSD
TSDT
f = 20 Hz to 20 kHz,
A-weighting
f = 20 Hz to 20 kHz,
A-weighting (SE mode)
8 Ω load
W
mW
uV
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
8
FAX: 886-3-6668836
℃
ms
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
DC ELECTRICAL CHARACTERISTICS (VDD=3.6V, TA=25℃)
SYMBOL
TEST CONDITION
IDD
VDD=3.6V, 8Ω Load (BTL)
VSHUTDOWN = 0V
ISD
HP sense= GND
PARAMETER
Power Supply Current
Shutdown Current
Shutdown, Headphone
High Input Voltage
Shutdown, Headphone
Low Input Voltage
Wake-up time
Output Offset Voltage
Sense
Sense
MIN.
-
TYP.
10.0
MAX.
16.5
UNIT
mA
-
0.1
2.0
µA
VSDIH
1.4
-
-
V
VSDIL
-
-
0.4
V
-
82
7.0
50
ms
mV
-
0.5
-
-
0.65
-
-
0.65
-
-
0.8
-
-
45
-
TWU
VOS
Bypass cap.=1.0uF
THD+N = 1%, f = 1 kHz,
RL=8Ω
THD+N = 10%, f = 1 kHz
RL=8Ω
THD+N = 1%, f = 1 kHz
RL=4Ω
Output Power
Po
THD+N = 10%, f = 1 kHz
RL=4Ω
THD+N = 0.1%, f = 1 kHz,
RL=32Ω (SE Mode)
THD+N = 0.1%, f = 1 kHz,
RL=16Ω (SE Mode)
Po = 0.2 Wrms; f = 1kHz,
Total Harmonic Distortion+ Noise THD+N
RL=8Ω
Vripple = 200mV sine p-p
Input terminated with 10Ω
Power Supply Rejection Ratio
PSRR
to GND
Output voltage noise
Thermal Shutdown Temperature
Shut Down Time
Vn
TSD
TSDT
f = 20 Hz to 20 kHz,
A-weighting
f = 20 Hz to 20 kHz,
A-weighting (SE mode)
8 Ω load
W
mW
-
83
-
-
0.12
-
%
-
56 (f =
217Hz)
62 (f =
1kHz)
-
dB
-
37.5
-
-
15
-
150
-
170
1.0
190
-
uV
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
9
FAX: 886-3-6668836
℃
ms
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
APPLICATION INFORMATION
The LY8661’s QFN package provides a low thermal resistance between the die and the PCB to which the part
is mounted and soldered. This allows rapid heat transfer from the die to the surrounding PCB copper traces,
ground plane and, finally, surrounding air. The result is a low voltage audio power amplifier that produces
2.0W at 10% THD with a 4Ω load. This high power is achieved through careful consideration of necessary
thermal design. Failing to optimize thermal design may compromise the LY8661’s high power performance
and activate unwanted, though necessary, thermal shutdown protection.
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 10 μF in parallel with a 0.1 μF filter
capacitor 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 1.0 μF tantalum bypass
capacitance connected between the LY8661’s supply pins and ground. Do not substitute a ceramic capacitor
for the tantalum. Doing so may cause oscillation. Keep the length of leads and traces that connect capacitors
between the LY8661’s power supply pin and ground as short as possible.
MICRO-POWER SHUTDOWN
The voltage applied to the SHUTDOWN pin controls the LY8661’s shutdown function. Activate micro-power
shutdown by applying GND to the SHUTDOWN pin. When active, the LY8661’s micro-power shutdown
feature turns off the amplifier’s bias circuitry, reducing the supply current. The low 0.1 μA typical shutdown
current is achieved by applying a voltage that is as near as GND as possible to the SHUTDOWN pin. A
voltage that is more than GND may increase the shutdown current.
Table 1 shows the logic signal levels that activate and deactivate micro-power shutdown and headphone
amplifier operation.
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 20k resistor
between the SHUTDOWN pin and Ground. Connect the switch between the SHUTDOWN pin VDD. Select
normal amplifier operation by closing the switch. Opening the switch sets the SHUTDOWN pin to ground
through the 20k resistor, which activates the 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.
Shutdown Pin
Logic High
Logic High
Logic Low
TABLE 1. Logic Level Truth Table
Headphone Jack
Operational Output
Sense Pin
Mode
Low (HP not Plugged in)
BTL
High (HP Plugged in)
Single-Ended
High or Low Don’t care
Micro-Power Shutdown
HEADPHONE SENSE AND HEADPHONE LOGIC IN FUNCTIONS
Applying a logic level to the LY8661’s HP Sense headphone control pin turns off Amp. A (+out) and Amp. B
(+out) muting a bridged-connected load. Quiescent current consumption is reduced when the IC is in this
single-ended mode.
Figure 2 shows the implementation of the LY8661’s headphone control function. With no headphones
connected to the headphone jack, the R5-R6 voltage divider sets the voltage applied to the HP Sense pin (pin
14) at approximately 50mV. This 50mV enables Amp A (+out) and Amp B (+out) placing the LY8661 in
bridged mode operation.
While the LY8661 operates in bridged mode, the DC potential across the load is essentially 0V. Therefore,
even in an ideal situation, the output swing cannot cause a false single-ended trigger. Connecting
headphones to the headphone jack disconnects the headphone jack contact pin from −OUTA and allows R7
to pull the HP Sense pin up to VDD.
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
10
FAX: 886-3-6668836
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
This enables the headphone function, turns off Amp A (+out) and Amp B (+out) which mutes the bridged
speaker. The amplifier then drives the headphones, whose impedance is in parallel with resistors R5 and R6.
These resistors have negligible effect on the LY8661’s output drive capability since the typical impedance of
headphones is 32Ω.
Figure 5 also shows the suggested headphone jack electrical connections. The jack is designed to mate with
a four wire (or three wire)plug. The plug’s tip and ring should each carry one of the two stereo output signals,
whereas the sleeve should carry the ground return. The headphone jack with one control pin contact is
sufficient to drive the HP Sense pin when connecting headphones.
As outlined above driving the Speaker (BTL) and Headphone (SE) loads simultaneously using LY8661 is
simple and easy. However this configuration will only work if the HP Logic pin is used to control the BTL/SE
operation and HP Sense pin is connected to GND(Figure 6).
FIGURE 5. With Headphone Circuit (QFN Type)
FIGURE 6. Without Headphone Circuit (QFN Type)
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
11
FAX: 886-3-6668836
®
LY8661
Rev. 1.8
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 LY8661 settles to quiescent operation, its
value is critical when minimizing turn-on pops. The slower the LY8661’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 LY8661 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
TON (Typ.) at 5.0V
C4
1.0uF
172 ms
0.47uF
76 ms
0.33uF
60 ms
0.22uF
50 ms
0.1uF
36 ms
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
12
FAX: 886-3-6668836
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
PACKAGE OUTLINE DIMENSION
16-Pin QFN 3X3 Package Outline Dimension
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
13
FAX: 886-3-6668836
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
16-Pin QFN 4X4 Package Outline Dimension
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
14
FAX: 886-3-6668836
®
LY8661
Rev. 1.8
Dual 2.0W/CH Stereo Audio Amplifier include Headphone Function
16 Pin SOP Package Outline Dimension
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
15
FAX: 886-3-6668836
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