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LY8261_12

型号：

LY8261_12

品牌：

LYONTEK[ Lyontek Inc. ]

页数：

18 页

PDF大小：

880 K

下载PDF手册
®
LY8261  
Rev. 1.5  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
„
FEATURES  
„
GENERAL DESCRIPTION  
„ 3.3W/CH Into 4Ω from 5.5V power supply at  
THD+N = 10%.  
„ 2.2V~5.5V Power supply.  
„ Support FM enhancement function.  
„ Support headphone function.  
„ Support mute function.  
The LY8261 is a high efficiency, high quality 3.3W  
stereo class D audio power amplifier which can  
operate FM enhance function to get good  
performance in FM mode. It is a low noise, filterless  
PWM architecture eliminates the output filter,  
reducing external component count, system cost  
(BOM cost), and simplify design.  
The device was designed to meet of Multimedia  
application includes mini speaker and other portable  
electronic devices.  
The LY8261 is a single 5.5V power supply, it is  
capable of driving 4Ω speaker load at a continuous  
average output of 3.3W/CH with 10% THD+N.  
The device also features an internal thermal  
shutdown protection and output pin short circuit  
( short to output pin, short to ground and short to  
VDD ) protection prevent the device from damage  
during fault conditions.  
„ Low shutdown Current.  
„ Low Quiescent Current.  
„ Short-Circuit Protection and automatic recovery.  
„ Over-Heat Protection and automatic recovery.  
„ Minimum external components.  
„ No output filter required for inductive loads.  
„ Low noise during turn-on and turn-off transitions.  
„ Lead free and green package available.  
(RoHS Compliant)  
„ Package : 16 pin 150 mil SOP.  
„
APPLICATION  
The LY8261 is easily to be used in various portable  
applications and products. such as FM speaker,  
MP3, MP4 and MP5 media players.  
„ Portable electronic devices  
„ Mobile phones, PDAs  
„ DVD/CD Players, TFT LCD TVs/Monitors  
„ USB Audio, Audio System  
„ iPod dock.  
„
PIN CONFIGURATION  
LY8261 SOP16 Pin Configuration (Top View)  
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
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
„
PIN DESCRIPTION  
Pin No.  
SYMBOL  
DESCRIPTION  
SOP16  
Vo-(L)  
GND  
1
2/15  
3
Negative(-) BTL output of left channel.  
Ground  
Vo+(L)  
VDD  
Positive(+) BTL output of left channel.  
Power supply of left and right channel.  
Shutdown control pin. (when LOW level is shutdown mode).  
Analog GND of left and right channel.  
Input of left channel.  
4/13  
5
Shutdown  
AGND  
INL  
6
7
Bypass  
8
Bypass pin.  
Headphone sense pin option.  
(If none headphone function must connect to GND).  
HP Sense  
INR  
9
10  
11  
12  
14  
16  
Input of right channel.  
Mute control pin. (when LOW level is mute mode).  
FM enhance pin. (when HIGH level is FM enhance mode).  
Positive(+) BTL output of right channel.  
Negative(-) BTL output of right channel.  
e
Mut  
FM Enhance  
Vo+(R)  
Vo-(R)  
ORDERING INFORMATION  
Feature  
Speaker  
Channels Package  
Pin/  
Output Power  
(THD+N=10%)  
Input Output  
Ordering  
Code  
Type  
Type  
FM  
enhance  
Mute Headphone  
3.3W/4Ω @5.5V_BTL  
2.7W/4Ω @5.0V_BTL  
2.0W/8Ω @5.5V_BTL  
1.6W/8Ω @5.0V_BTL  
LY8261SL  
Stereo  
SOP16  
SE  
BTL  
Yes  
Yes  
Yes  
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  
2
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
„
TYPICAL APPLICATION CIRCUIT  
Figure 1. LY8261SL Typical Application Circuit  
„
ABSOLUTE MAXIMUM RATINGS  
PARAMETER  
SYMBOL  
VDD  
RATING  
6.0  
UNIT  
V
Power supply voltage range  
Operating temperature  
Input voltage range  
℃
TA  
-40 to 85 (I grade)  
-0.3V to VDD +0.3V  
-65 to 150  
Internally Limited  
2000  
VI  
V
℃
Storage temperature  
TSTG  
PD  
Power dissipation  
W
V
℃
℃
ESD susceptibility  
VESD  
TJMAX  
TSOLDER  
Junction temperature  
Soldering temperature (under 10 sec)  
150  
260  
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  
3
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
„
ELECTRICAL CHARACTERISTICS (TA = 25℃)  
PARAMETER  
TYP. *2  
SYMBOL  
TEST CONDITION  
MIN.  
MAX. UNIT  
Power supply voltage  
-
2.2  
-
11  
9
5.5  
V
VDD  
VDD = 5.5V, No Load  
VDD = 3.7V, No Load  
VDD = 2.5V, No Load  
-
-
-
-
-
-
Quiescent current  
(FM enhance pin=low)  
IQ  
mA  
7
≦
VSHUTDOWN  
V
-
0.8V,  
Shutdown current  
ISD  
-
0.1  
-
A
µ
DD = 2.5V to 5.5V  
Shutdown voltage input high  
Shutdown voltage input low  
1.2  
-
-
-
-
VSDIH  
VSDIL  
V
-
0.4  
VI = 0 V, Av = 2 V/V,  
DD = 2.5 V to 5.5 V  
Shutdown temp.  
Restore temp.  
Output offset voltage  
-
-
25  
mV  
VOS  
TSD  
V
-
-
180  
135  
-
-
Thermal shutdown temperature  
℃
(*2)Typical values are included for reference only and are not guaranteed or tested.  
Typical values are measured at VCC = VCC(TYP.) and TA = 25℃  
„
OPERATING CHARACTERISTICS (1) (TA = 25℃)  
PARAMETER  
TYP. *2  
SYMBOL  
TEST CONDITION  
MIN.  
MAX. UNIT  
-
-
-
3.3  
2.7  
1.4  
2.6  
1.7  
-
-
-
VDD=5.5V  
THD+N=10%  
VDD=5.0V  
VDD=3.7V  
VDD=5.5V  
VDD=5.0V  
VDD=3.7V  
RL = 4Ω,  
f = 1kHz,  
-
-
-
-
THD+N=1%  
1.2*1  
2.0  
1.6  
0.8  
1.6  
1.3  
0.6  
Output power / channel  
PO  
W
VDD=5.5V  
-
-
-
-
THD+N=10% VDD=5.0V  
VDD=3.7V  
RL = 8Ω,  
f = 1kHz,  
VDD=5.5V  
THD+N=1%  
-
-
-
-
VDD=5.0V  
VDD=3.7V  
(*1)PS: RL = 4Ω,f = 1kHz, VDD=3.7V, Output Power=1.2W@ THD+N=2%  
(*2)Typical values are included for reference only and are not guaranteed or tested.  
Typical values are measured at VCC = VCC(TYP.) and TA = 25℃  
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  
4
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
„
OPERATING CHARACTERISTICS (2) (TA = 25℃)  
TYP. *2  
SYMBOL  
TEST CONDITION  
Av=10 V/V ,Input=GND  
MIN.  
MAX. UNIT  
PARAMETER  
-
-62.4  
-
f=1KHz  
Power supply rejection ratio  
PSRR Ri=33K, Ci=0.47μF  
dB  
f=217Hz  
RL=4Ohm, VDD=5.0V  
-
-62  
-
LÆR  
RÆL  
-
-
85.4  
77.6  
-
RL = 4Ω,f=1kHz,  
Cs  
Crosstalk  
dB  
0.25W=0dB, VDD=5.0V  
RL = 8Ω,Av=2 V/V,  
1.0W=0dB  
VDD = 5.0V, RL = 8Ω,  
Av=2 V/V, Inputs=GND,  
f = 20Hz to 20kHz,  
Signal-to-noise ratio  
SNR  
-
86.8  
-
-
dB  
uV  
VDD=5.0V  
No  
Output voltage noise  
Vn  
-
128.7  
weighting  
Cbypass = 4.7μF  
Cbypass = 2.2μF  
Cbypass = 1.0μF  
Cbypass =0.47μF  
Cbypass = 0.22μF  
Cbypass =0.1μF  
Cbypass =None  
Cbypass = 4.7μF  
Cbypass = 2.2μF  
Cbypass = 1.0μF  
Cbypass =0.47μF  
Cbypass = 0.22μF  
Cbypass =0.1μF  
Cbypass =None  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
300  
156  
138  
72  
40  
32  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
VDD = 5.0V  
22  
Start-up time from shutdown  
ZI  
ms  
236  
140  
128  
63  
36  
28  
VDD = 3.7V  
22  
245  
kHz  
%
V/V  
Frequency  
Efficiency  
Fc  
η
Gv  
VDD=2.5V~5.5V  
f=1kHz, RL=8Ω, Output=1.4W  
VDD= 2.5V to 5.5V  
-
88  
Total Gain *3  
[150KΩ / (5KΩ+Ri)] x4  
(*2)Typical values are included for reference only and are not guaranteed or tested.  
Typical values are measured at VCC = VCC(TYP.) and TA = 25℃  
(*3)The audio amplifier’s gain is determined by：  
Pre-Amplifier Gain = [150KΩ / ( 5KΩ + Ri )] x 2  
Total Gain = {[150KΩ / ( 5KΩ + Ri )] x 2} x 2  
where Ri is the external serial resistance at the input pin.  
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
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
TYPICAL PERFORMANCE CHARACTERISTICS  
Figure 2  
Total Harmonic Distortion + Noise vs Output Power (4Ω)  
Figure 3  
Total Harmonic Distortion + Noise vs Output Power (8Ω)  
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  
6
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
Figure 4  
SNR vs. Noise Level  
Figure 5  
Crosstalk  
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  
7
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
Quiescent Current vs. Supply Voltage  
QUIECENT CURRENT vs SUPPLY VOLTAGE  
FM Enhance=Enable  
QUIESCENT CURRENT vs SUPPLY VOLTAGE  
FM Enhance=Disable  
20  
18  
16  
14  
12  
10  
8
20  
18  
16  
14  
12  
10  
8
No Load  
4Ω, 2ch  
8Ω, 2ch  
No Load  
4Ω, 2CH  
8Ω, 2CH  
6
6
4
4
2.5  
3
3.5  
4
4.5  
5
5.5  
2.5  
3
3.5  
4
4.5  
5
5.5  
VDD - Supply Voltage - V  
VDD - Supply Voltage - V  
SD Current vs. SD Voltage  
SHUTDOWN CURRENT vs SHUTDOWN VOLTAGE  
FM Enhance=Enable  
SHUTDOWN CURRENT vs SHUTDOWN VOLTAGE  
FM Enhance=Disable  
160  
140  
120  
100  
80  
160  
140  
120  
100  
80  
2.5v  
3.7v  
5v  
2.5v  
3.7V  
5v  
60  
60  
40  
40  
20  
20  
0
0
0
0.1  
0.2  
0.3  
0.4  
0.5  
0.6  
0.7  
0.8  
0.9  
0.1  
0.2  
0.3  
0.4  
0.5  
0.6  
0.7  
0.8  
0.9  
Shutdown Voltage - V  
Shutdown Voltage - V  
Supply Current vs. Output Power (RL=4Ω)  
SUPPLY CURRENT vs OUTPUT POWER  
FM Enhance=Disable  
SUPPLY CURRENT vs OUTPUT POWER  
FM Enhance=Enable  
900  
800  
700  
600  
500  
400  
300  
200  
100  
0
1000  
900  
800  
700  
600  
500  
400  
300  
200  
100  
0
2.5V  
3.7V  
5.0V  
2.5V  
3.7V  
5.0V  
1
2
3
4
5
6
7
8
9
10  
1
2
3
4
5
6
7
8
9
10  
Po-Output Power-W (RL=4 Ohm)  
Po-Output Power-W (RL=4 Ohm)  
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  
8
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
Supply Current vs. Output Power (RL=8Ω)  
SUPPLY CURRENT vs OUTPUT POWER  
FM Enhance=Enable  
SUPPLY CURRENT vs OUTPUT POWER  
FM Enhance=Disable  
500  
450  
400  
350  
300  
250  
200  
150  
100  
50  
500  
450  
400  
350  
300  
250  
200  
150  
100  
50  
2.5V  
3.7V  
5.0V  
2.5V  
3.7V  
5.0V  
0
0
0
0.2  
0.4  
0.6  
0.8  
1
1.2  
1.4  
1.6  
1.8  
2
0
0.2  
0.4  
0.6  
0.8  
1
1.2  
1.4  
1.6  
1.8  
2
Po - Output Power - W (RL=8Ω)  
Po - Output Power - W (RL=8Ω)  
Load Resistance vs. Output Power (THD+N=1%)  
OUTPUT POWER vs LOAD RESISTANCE  
FM Enhance=Enable  
Output Power vs Load Resistance  
FM Enhance=Disable  
2.5  
2
2.5v  
3.7V  
5V  
3
2.5  
2
3.7V  
5V  
5.5V  
5.5V  
1.5  
1
1.5  
1
0.5  
0
0.5  
0
4Ω  
8Ω  
12Ω  
RL - Load Resistance - Ω  
Freq = 1kHz, Gain = 2V/V, THD+N = 1%  
16Ω  
20Ω  
24Ω  
28Ω  
32Ω  
4Ω  
8Ω  
12Ω  
16Ω  
RL - Load Resistance - Ω  
Freq = 1kHz, Gain = 2V/V, THD+N = 1%  
20Ω  
24Ω  
28Ω  
32Ω  
Load Resistance vs. Output Power (THD+N=10%)  
OUTPUT POWER vs LOAD RESISTANCE  
FM Enhance=Disable  
Output Power vs Load Resistor  
FM Enhance=Disable  
3.3  
3
3.5  
3
2.5v  
2.5v  
3.7V  
5V  
3.7V  
5V  
2.7  
2.4  
2.1  
1.8  
1.5  
1.2  
0.9  
0.6  
0.3  
0
5.5V  
5.5V  
2.5  
2
1.5  
1
0.5  
0
4Ω  
8Ω  
12Ω  
16Ω  
20Ω  
24Ω  
28Ω  
32Ω  
4Ω  
8Ω  
12Ω  
16Ω  
RL - Load Resistance - Ω  
Freq = 1kHz, Gain = 2V/V, THD+N = 10%  
20Ω  
24Ω  
28Ω  
32Ω  
RL - Load Resistance - Ω  
Freq = 1kHz, Gain = 2V/V, THD+N = 10%  
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  
9
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
OUTPUT POWER vs. SUPPLY VOLTAGE (RL=4Ω)  
OUTPUT POWER vs SUPPLY VOLTAGE  
FM Enhance=Enable  
OUTPUT POWER vs SUPPLY VOLTAGE  
FM Enhance=Disable  
4
3.5  
3
4.5  
THD+N=10%  
THD+N=1%  
THD+N=10%  
THD+N=1%  
4
3.5  
3
2.5  
2
2.5  
2
1.5  
1
1.5  
1
0.5  
0
0.5  
0
2.5  
3.7  
5
5.5  
6
2.5  
3.7  
VDD - Supply Voltage - V  
RL=4Ω, f=1K Hz, Gain=2 V/V  
5
5.5  
6
VDD - Supply Voltage - V  
RL=4Ω, f=1K Hz, Gain=2 V/V  
OUTPUT POWER vs. SUPPLY VOLTAGE (RL=8Ω)  
OUTPUT POWER vs SUPPLY VOLTAGE  
FM Enhance=Enable  
OUTPUT POWER vs SUPPLY VOLTAGE  
FM Enhance=Disable  
2.8  
2.4  
2
2.8  
2.4  
2
THD+N=10%  
THD+N=1%  
THD+N=10%  
THD+N=1%  
1.6  
1.2  
0.8  
0.4  
0
1.6  
1.2  
0.8  
0.4  
0
2.5  
3.7  
VDD - Supply Voltage - V  
RL=8Ω, f=1K Hz, Gain=2 V/V  
5
5.5  
6
2.5  
3.7  
VDD - Supply Voltage - V  
RL=8Ω, f=1K Hz, Gain=2 V/V  
5
5.5  
6
Power Dissipation vs. Output Power (8Ohm)  
POWER DISSIPATION vs OUTPUT POWER  
FM Enhance=Disable  
POWER DISSIPATION vs OUTPUT POWER  
FM Enhance=Enable  
1
0.9  
0.8  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0
2
1.8  
1.6  
1.4  
1.2  
1
0.8  
0.6  
0.4  
0.2  
0
5V  
5V  
3.7V  
3.7V  
0
0.2  
0.4  
0.6  
0.8  
1
1.2  
1.4  
0
0.2  
0.4  
0.6  
0.8  
1
1.2  
1.4  
Po - Output Power - W  
Po - Output Power - W  
RL=8Ω  
RL=8Ω  
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  
10  
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
Efficiency vs. Output Power (RL=4Ω,VDD=3.7V)  
Efficiency vs. Output Power (RL=4Ohm,VDD=5V)  
Efficiency vs Output Power(W)  
RL=8 ohm,VDD=3.7V  
Efficiency vs Output Power(W)  
RL=8 ohm,VDD=5V  
90  
80  
70  
60  
50  
40  
90  
80  
70  
60  
50  
40  
30  
30  
FM Enhance=Disable  
FM Enhance=Disable  
20  
20  
FM Enhance=Enable  
10  
FM Enhance=Enable  
10  
0
0
0
0.2  
0.4  
0.6  
0.8  
1
1.2  
1.4  
0
0.1  
0.2  
0.3  
0.4 0.5  
Po-Output Power(W)  
Po-Output Power(W)  
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  
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
„
APPLICATION INFORMATION  
Input Resistors (Ri) and Gain  
The LY8261 have two internal amplifier stages. The pre-amplifier gain is externally configurable, while the total gain  
is internally fixed. The closed-loop gain of the pre-amplifier gain is set by selecting the Rf to Ri while the total gain is  
fixed at 4x. So the input resistors (Ri) set the gain of the amplifier according to the equation.  
Pre-Amplifier Gain = (Rf / Ri) x 2  
Total Gain = [(Rf / Ri ) x 2] x 2  
AVD = 20 x log [4 x (Rf /Ri )]  
The resistor matching is very important in the amplifiers. Balance of the output on the reference voltage depends on  
matched ratio of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion if resistor  
mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to keep the performance  
optimized. Matching is more important than overall tolerance.  
Resistor arrays with 1% matching can be used with a tolerance greater than 1%.Place the input resistors very close  
to the LY8261 to limit noise injection on the high-impedance nodes. For optimal performance the gain should be set  
to 4 V/V or lower. Lower gain allows the LY8261 to operate at its best,  
For example  
Table 1. Typical Total Gain and AVD Values  
Rf (KΩ)  
Ri (KΩ)  
150  
150  
2
150  
75  
150  
50  
150  
25  
150  
15  
Pre AMP. Gain  
Total Gain  
AVD (db)  
4
6
12  
20  
4
8
12  
24  
40  
12.04  
18.06  
21.58  
27.60  
32.04  
Input Capacitors (Ci)  
The LY8261 using single-end source, So the input coupling capacitors are required. The input capacitors and input  
resistors form a high-pass filter with the corner frequency(fc), determined in the equation.  
fc = 1 / ( 2πRi Ci )  
The value of the input capacitor is important to consider as it directly affects the bass (low frequency)  
performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the  
corner frequency can be set to block low frequencies in this application. Equation is reconfigured to solve for the  
input coupling capacitance.  
Ci = 1 / ( 2πRi fc )  
If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better,  
because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below.  
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  
12  
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
For example  
In the table 2 shows the external components. Rin in connect with Cin to create a high-pass filter.  
Table 2. Typical Component Values  
Reference  
Description  
Note  
Ri  
Ci  
150KΩ  
0.22uF  
1% tolerance resistors  
80%/–20%  
Ci = 1 / ( 2πRi fc)  
Ci = 1 / ( 2π x 150KΩ x 4.8Hz)=0.221uF，Use 0.22uF  
Decoupling Capacitor  
The LY8261 is a high-performance class-D audio amplifier that requires adequate power supply decoupling to  
ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients, spikes, or  
digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 10.0uF, placed as  
close as possible to the device VDD lead works best. Placing 0.1uF decoupling capacitor close to the LY8261 is very  
important for the efficiency of the class-D amplifier, because any resistance or inductance in the trace between the  
device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise signals, a 10.0uF or  
greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications  
because of the high PSRR of this device.  
Over-Heat Protection  
The LY8261 has a built-in over-heat protection circuit at FM enhance pin enable, it will turn off all power output when  
the chip temperature over 180℃, the chip will return to normal operation automatically after the temperature cool  
down to 135℃.  
FM Enhance  
The LY8261 has a built-in FM enhance function and the pin should never be left floating. When FM radio  
signal is poor. Enable (active to high) the FM enhance pin will improve the signal obviously. But enable the pin will  
reduce LY8261 efficiency. Therefore recommend if FM enhance function is not to use. Disable (active to low) the  
FM enhance pin is very important.  
Mute Function  
The mute pin is an input for controlling the output state of the LY8261. A logic high on this pin enables the outputs. A  
logic low on this pin disables the outputs. This pin may be used as a quick disable/enable of outputs when  
transitioning between different audio sources.  
The mute pin should never be left floating. For power conservation, the Shutdown pin should be used to reduce the  
quiescent current to the absolute minimum level.  
Headphone Sense and headphone logic in functions  
Applying a voltage between 4V and VDD to the LY8261’s HP-SENCE pin turns off the speaker, muting the a  
bridged-connected load. Quiescent current consumption is reduced when the device is in this single-ended mode.  
Figure 6 shows the implementation of the LY8261’s headphone control function. With no headphones connected to  
the headphone jack, the R10 – R6(R5) voltage divider sets the voltage applied to the HP-SENCE pin at  
approximately 50mV. This 50mV enables the speaker, placing the LY8261 in bridged mode operation.  
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  
13  
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
While the LY8261 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 −Vout R (−Vout L) and allows R10 to pull the  
HP-SENCE pin up to VDD.  
This enables the headphone function, turns off the speaker, and 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 LY8261’s output drive capability since the typical impedance of headphones is 32Ω.  
Figure 6 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-SENCE pin when connecting headphones.  
As outlined above driving the Speaker (BTL) and Headphone (SE) loads simultaneously using LY8261 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 7).  
Figure 6. With Headphone Circuit  
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  
14  
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
Figure 7. Without Headphone Circuit  
„
PCB LAYOUT  
All the external components must place very close to the LY8261. The input resistors need to be very close to the  
LY8261 input pins so noise does not couple on the high impedance nodes between the input resistors and  
the input amplifier of the LY8261. Then place the decoupling capacitor Cs, close to the LY8261 is important  
for the efficiency of the class-D amplifier. Any resistance or inductance in the trace between the device and the  
capacitor can cause a loss in efficiency.  
Making the high current traces going to VDD, GND, VO+ and VO- pins of the LY8261 should be as wide as possible to  
minimize trace resistance. If these traces are too thin, the LY8261's performance and output power will decrease.  
The input traces do not need to be wide, but do need to run side-by-side to enable common-mode noise cancellation.  
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  
15  
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
„
DEMO BOARD INFORMATION  
Demo Board Application Circuit  
Figure 8. Demo Board Application Circuit  
Demo Board BOM List  
LY8261 V2.1 BOM List  
No.  
Description  
Reference  
Note  
1
2
3
Resistor, 100KΩ  
Resistor, 51KΩ  
Resistor, 1KΩ  
R7,R8,R9,R10,R11  
R1,R2  
1/16W,1%  
1/16W,1%  
1/16W,1%  
R5,R6  
4
Resistor, 100Ω  
R3,R4  
1/16W,1%  
80%/−20%,  
nonpolarized  
80%/−20%,  
nonpolarized  
80%/−20%, 6.3V  
25V,105℃,8x11  
5
Capacitor, 0.1uF  
C1,C2,C4,C5  
6
Capacitor, 4.7uF  
C3  
7
8
9
Capacitor, 10.0uF  
Capacitor, 220.0uF  
IC  
C7  
C6  
U1  
LY8261SL, SOP16  
Pitch 2.54 mm  
10  
1*2 Pin Header  
J2,J3,J6  
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  
16  
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
Demo Board Artwork  
Top Silkscreen  
Top Layer  
Composite view  
Bottom Layer  
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  
17  
®
LY8261  
3.3W Stereo & FM Enhancement Class D Audio Power Amplifier  
Rev. 1.5  
„
PACKAGE OUTLINE DIMENSION  
SOP 16 Pin 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  
FAX: 886-3-6668836  
18  
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