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LY8005

型号：

LY8005

描述：

2.3 3W单声道无滤波器D类音频功率放大器（ MSOP ）[ 2.3 W Mono Filterless Class D Audio power Amplifier (MSOP) ]

品牌：

LYONTEK[ Lyontek Inc. ]

页数：

22 页

PDF大小：

1170 K

下载PDF手册
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
FEATURES  
GENERAL DESCRIPTION  
„ 2.3 W Into 4Ω from 5.0V power supply at  
THD = 10% (Typ.).  
„ 1.4 W Into 8Ω from 5.0V power supply at  
THD = 10% (Typ.).  
„ 2.5V~5.5V Power supply.  
„ Low shutdown current.  
The LY8005 is a high efficiency, 2.3 W mono class D  
audio power amplifier. It is a low noise, filterless  
PWM architecture eliminates the output filter,  
reducing external component count, system cost,  
and simplify design.  
„ Low quiescent current.  
The LY8005 is designed to meet of mobile phones  
and other portable electronic devices. The LY8005  
is a single 5V supply, it is capable of driving 4Ω  
speaker load at a continuous average output of 2.3  
W with 10% THD+N. The LY8005 has high  
efficiency with speaker loads compared to a typical  
Class AB amplifier.  
In cellular handsets, the earpiece, speaker phone,  
and melody ringer can each be driven by the  
LY8005.The gain of the LY8005 is externally  
configurable which allows independent gain control  
from multiple sources by summing the signals.  
Output short circuit and thermal overload protection  
prevent the device from damage during fault  
conditions.  
„ Minimum external components.  
„ No output filter required for inductive loads.  
„ Output Pin Short-Circuit Protection (Short to  
Output Pin, Short to GND, Short to VDD).  
„ Low noise during turn-on and turn-off transitions.  
„ Lead free and green package available.  
(RoHS Compliant)  
„ 8-pin MSOP package.  
APPLICATION  
„ Portable electronic devices  
„ Mobile Phones  
„ PDAs  
PIN CONFIGURATION  
8 Pin MSOP Package (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
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
PIN DESCRIPTION  
SYMBOL  
SHUTDOWN  
NC  
Pin No.  
DESCRIPTION  
1
2
3
4
5
6
7
8
Shutdown the device.(when low level is active the pin)  
No internal connection  
Positive input  
+IN  
-IN  
Negative input  
Vo+  
Positive BTL output  
Power supply  
VDD  
GND  
Vo2  
Ground  
Negative BTL output  
ORDERING INFORMATION  
LY 8 005 VV  
V : Package Type  
UL : 8-Pin MSOP  
Product Name  
A : Product Line  
LY : Lyontek Product Number Prefix  
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
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
APPLICATION CIRCUIT  
Figure 1. Application Schematic With Differential Input Configuration  
Figure 2. Application Schematic With Differential and Capacitors Input 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  
FAX: 886-3-6668836  
3
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
Figure 3. Application Schematic With Single-Ended Input  
ABSOLUTE MAXIMUN RATINGS*  
PARAMETER  
Supply Voltage  
SYMBOL  
VDD  
RATING  
6.0  
UNIT  
V
℃
Operating Temperature  
Input Voltage  
TA  
-40 to 85 (I grade)  
-0.3V to VDD +0.3V  
-65 to 150  
Internally Limited  
2000  
VI  
V
℃
Storage Temperature  
Power Dissipation  
TSTG  
PD  
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  
4
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
ELECTRICAL CHARACTERISTICS (TA = 25℃,Unless otherwise noted)  
SYMBOL  
TEST CONDITION  
VI = 0 V, Av = 2 V/V,  
VDD = 2.5 V to 5.5 V  
VDD = 5.5 V, VI = 5.8 V  
VDD = 5.5 V, VI = 0.3 V  
MIN.  
TYP.  
MAX. UNIT  
PARAMETER  
Output offset voltage  
(measured differentially)  
High-level input current  
Low-level input current  
Power supply rejection ratio  
-
-
25  
mV  
|VOS|  
|IIH|  
|IIL|  
-
-
-
-
100  
5
-55  
uA  
uA  
dB  
PSRR VDD = 2.5 V to 5.5 V  
VDD=2.5V to 5.5V,  
-75  
Common mode rejection ratio  
CMRR VIC= VDD/2 to 0.5 V,  
VIC= VDD/2 to VDD-0.8 V,  
VDD = 5.5V, No Load  
-60  
-48  
dB  
-
-
-
3.4  
2.8  
2.2  
4.5  
-
3.2  
Quiescent Current  
Shutdown Current  
IQ  
mA  
VDD = 3.6V, No Load  
VDD = 2.5V, No Load  
VSHUTDOWN = 0.8V,  
ISD  
-
0.3  
2
A
µ
VDD = 2.5V to 5.5V  
OPERATING CHARACTERISTICS (TA = 25℃, Gain = 2V/V, RL = 8Ω, Unless otherwise noted)  
SYMBOL  
TEST CONDITION  
MIN.  
TYP.  
1.1  
0.64  
0.3  
MAX. UNIT  
PARAMETER  
-
-
-
-
-
-
-
-
-
-
-
-
-
VDD=5V  
THD+N= 1%, f = 1 kHz,  
RL= 8Ω  
W
W
W
W
-
-
-
-
-
-
-
-
-
-
-
VDD=3.6V  
VDD=2.5V  
VDD=5V  
1.5  
THD+N= 10%, f = 1 kHz,  
RL= 8Ω  
0.79  
0.37  
1.57  
0.77  
0.4  
2.3  
1.16  
0.53  
VDD=3.6V  
VDD=2.5V  
VDD=5V  
Out Power  
PO  
THD+N= 1%, f = 1 kHz,  
RL= 4Ω  
VDD=3.6V  
VDD=2.5V  
VDD=5V  
THD+N= 10%, f = 1 kHz,  
VDD=3.6V  
VDD=2.5V  
RL= 4Ω  
PO = 1.0 W, f = 1 kHz,  
RL = 8Ω  
PO = 0.5 W, f = 1 kHz,  
RL = 8Ω  
PO = 0.2 W,f = 1 kHz,  
RL = 8Ω  
-
-
-
0.07  
0.075  
0.05  
-
-
-
VDD=5V  
VDD=3.6V  
VDD=2.5V  
Total harmonic distortion + noise THD+N  
%
f = 217 Hz,  
V(RIPPLE) = 200mVpp,  
inputs ac-grounded  
with Ci = 2uF  
Supply ripple rejection ratio  
Signal-to-noise ratio  
KSVR  
-
-71  
-
dB  
dB  
VDD=3.6V  
VDD=5V  
SNR PO= 1 W, RL = 8Ω  
-
-
97  
48  
-
-
-
VDD = 3.6 V,  
f = 20 Hz to 20 kHz,  
Inputs ac-grounded with  
Ci = 2 μF  
No  
weighting  
Output voltage noise  
Vn  
uVRMS  
-
A
36  
weighting  
VDD=3.6V  
Common mode rejection ratio  
Start-up time from shutdown  
CMRR VIC = 1 Vpp , f = 217 Hz  
-
-
-63  
1
-
-
dB  
ms  
ZI  
VDD = 3.6 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
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
TYPICAL PERFORMANCE CHARACTERISTICS  
Figure 4  
Total Harmonic Distortion + Noise vs Frequency  
Figure 5-1  
Total Harmonic Distortion + Noise vs Output Power (8 Ω)  
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
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
Figure 5-2  
Total Harmonic Distortion + Noise vs Output Power (4 Ω)  
Figure 6  
Efficiency vs Output power ( RL=8Ω, 33μH)  
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
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
Figure 7  
Power dissipation vs Output power ( RL=8Ω, 33μH)  
Figure 8  
Supply Current vs Output Power ( RL=8Ω, 33μH)  
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
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
Figure 9  
Output Power vs Load Resistance (Po at 10 % THD with f = 1 kHz)  
Figure 10  
Output Power vs Load Resistance (Po at 1 % THD with f = 1 kHz)  
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
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
Figure 11  
THD+N & Output Power vs Temperature (VDD=3V, RL=8Ω)  
100  
10  
1
0.1  
25C  
80C  
85C  
-20C  
-40C  
0.01  
0.0001  
0.001  
0.01  
0.1  
1
Po - Output Power (W)  
Figure 12  
THD+N & Output Power vs Temperature (VDD=4.5V, RL=8Ω)  
100  
10  
1
25C  
80C  
85C  
-20C  
-40C  
0.1  
0.01  
0.0001  
0.001  
0.01  
0.1  
1
10  
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  
10  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
Figure 13  
THD+N & Output Power vs Temperature (VDD=5.0V, RL=8Ω)  
100  
10  
1
25C  
80C  
85C  
-20C  
-40C  
0
0
0.0001  
0.001  
0.01  
0.1  
1
10  
Po - Output Power (W)  
Figure 14  
FCC Class-B (Vertical)  
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  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
Figure 15  
FCC Class-B (Horizontal)  
Figure 16  
CISPR Class-B (Vertical)  
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  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
Figure 17  
CISPR Class-B ( Horizontal)  
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  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
APPLICATION INFORMATION  
Fully Differential Amplifier  
The LY8005 is a fully differential amplifier with differential inputs and outputs. The fully differential amplifier  
consists of a differential amplifier and a common-mode amplifier. The differential amplifier ensures that the  
amplifier outputs a differential voltage on the output that is equal to the differential input times the gain. The  
common-mode feedback ensures that the common-mode voltage at the output is biased around VDD/2  
regardless of the common-mode voltage at the input. The fully differential LY8005 can still be used with a  
single-ended input; however, the LY8005 should be used with differential inputs when in a noisy environment,  
like a wireless handset, to ensure maximum noise rejection.  
Advantages of Fully Differential Amplifiers  
Input-coupling capacitors not required:  
The fully differential amplifier allows the inputs to be biased at voltage other than mid-supply. For example,  
if a codec has a midsupply lower than the midsupply of the LY8005, the common-mode feedback circuit will  
adjust, and the LY8005 outputs will still be biased at midsupply of the LY8005. The inputs of the LY8005 can  
be biased from 0.5 V to VDD - 0.8 V. If the inputs are biased outside of that range, input - coupling capacitors  
are required.  
Midsupply bypass capacitor, C(BYPASS), not required:  
The fully differential amplifier does not require a bypass capacitor. This is because any shift in the midsupply  
affects both positive and negative channels equally and cancels at the differential output.  
Better RF-immunity:  
GSM handsets save power by turning on and shutting off the RF transmitter at a rate of 217 Hz. The  
transmitted signal is picked-up on input and output traces. The fully differential amplifier cancels the signal  
much better than the typical audio amplifier.  
Component Selection  
Figure 1 shows the LY8005 typical schematic with differential inputs and Figure 2 shows the LY8005  
with differential and capacitors inputs , and Figure 3 shows the LY8005 with single-ended inputs.  
Differential inputs should be used whenever possible because the single-ended inputs are much more  
susceptible to noise.  
Table 1. Typical Component Values  
Reference  
Description  
150KΩ  
1.0uF  
Note  
1% tolerance resistors  
+22%,-80%  
Ri  
Cs  
Ci  
3.3 nF  
(±10%)  
(1) Ci is only needed for single-ended input or if VICM is not between 0.5 V and VDD - 0.8 V. CI = 3.3 nF  
(with Ri = 150KΩ) gives a high-pass corner frequency of 321 Hz.  
For example  
fc = 1 / ( 2πRiCi )  
fc = 1 / ( 2π x 150KΩ x 3.3nF) = 321.524 Hz  
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  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
Input Resistors (Ri)  
The input resistors (RI) set the gain of the amplifier according to equation Equation 1.  
150 kΩ  
Pre-Amplifier Gain = -----------  
Ri  
150 kΩ  
Total Gain = 2 x -------------- …………………………………………………………….(1)  
Ri  
150 kΩ  
AVD = 20 x log [2 x ( ----------- )]  
Ri  
Resistor matching is very important in fully differential amplifiers. The balance of the output on the  
reference voltage depends on matched ratios of the resistors. CMRR, PSRR, and cancellation of the second  
harmonic distortion diminish 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 LY8005 to limit noise injection on the high-impedance nodes.  
For optimal performance the gain should be set to 2 V/V or lower. Lower gain allows the LY8005 to operate at  
its best, and keeps a high voltage at the input making the inputs less susceptible to noise.  
For example  
Table 2. Typical Total Gain and AVD Values  
Rf (KΩ)  
Ri (KΩ)  
150  
150  
1
150  
75  
150  
50  
150  
37.5  
4
150  
25  
150  
18.75  
8
Pre AMP. Gain  
Total Gain  
AVD (db)  
2
3
6
2
4
6
8
12  
16  
6.02  
12.04  
15.56  
18.06  
21.58  
24.08  
Decoupling Capacitor (CS)  
The LY8005 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  
1 μF, placed as close as possible to the device VDD lead works best. Placing this decoupling capacitor close to  
the LY8005 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 μF 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.  
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  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
Input Capacitors (Ci)  
The LY8005 does not require input coupling capacitors if the design uses a differential source that is biased  
from 0.5 V to VDD - 0.8 V (shown in Figure 1). If the input signal is not biased within the recommended  
common-mode input range, if needing to use the input as a high pass filter (shown in Figure 2), or if using a  
single-ended source (shown in Figure 3), input coupling capacitors are required.  
The input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in  
equation Equation 2.  
1
fc = ----------------………………………………………………………………(2)  
2πRiCi  
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 Equation 3 is reconfigured to solve for the input coupling capacitance.  
1
Ci = -----------------…………………………………………………………….(3)  
2πRifc  
For example  
In the table 3 shows the external components. Rin in connect with Cin to create a high-pass filter.  
Table 3. Typical Component Values  
Reference  
Description  
Note  
Ri  
Ci  
150KΩ  
0.22uF  
1% tolerance resistors  
80%/–20%  
Ci = 1 / ( 2πRifc)  
Ci = 1 / ( 2π x150KΩ x4.8Hz)=0.221uF，Use 0.22uF  
Summing Input Signals With The LY8005  
Most wireless phones or PDAs need to sum signals at the audio power amplifier or just have two signal  
sources that need separate gain. The LY8005 makes it easy to sum signals or use separate signal sources  
with different gains. Many phones now use the same speaker for the earpiece and ringer, where the wireless  
phone would require a much lower gain for the phone earpiece than for the ringer. PDAs and phones that  
have stereo headphones require summing of the right and left channels to output the stereo signal to the  
mono speaker.  
Summing Two Differential Input Signals  
Two extra resistors are needed for summing differential signals (a total of 5 components). The gain for each  
input source can be set independently (see equations Equation 4 and Equation 5, and Figure 18).  
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  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
VO  
150kΩ  
Gain 1 = ---------- = 2 x -------------……………………………………………(4)  
VI1  
Vo  
RI1  
150kΩ  
Gain 2 = ---------- = 2 x -------------…………………………………………….(5)  
VI2 RI2  
If summing left and right inputs with a gain of 1 V/V, use RI1= RI2= 300 kΩ  
If summing a ring tone and a phone signal, set the ring-tone gain to Gain 2 = 2 V/V, and the phone gain to  
gain 1 = 0.1 V/V. The resistor values would be. . .  
RI1 = 3 MΩ, and = RI2 = 150 kΩ.  
Figure 18. Application Schematic With LY8005 Summing Two Differential Input  
Summing a Differential Input Signal and a Single-Ended Input Signal  
Figure 19 shows how to sum a differential input signal and a single-ended input signal. Ground noise can  
couple in through IN+ with this method. It is better to use differential inputs. The corner frequency of the  
single-ended input is set by CI2, shown in equation Equation 8. To assure that each input is balanced, the  
single-ended input must be driven by a low-impedance source even if the input is not in use.  
VO  
150kΩ  
Gain 1 = ---------- = 2 X ---------------……………………………………………(6)  
Vi1  
Ri1  
VO  
150kΩ  
Gain 2 = ---------- = 2 X -----------------………………………………………….(7)  
Vi2 Ri2  
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  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
1
Ci2 = ------------------……………………………………………………………..(8)  
2πRI2 fc2  
If summing a ring tone and a phone signal, the phone signal should use a differential input signal while the  
ring tone might be limited to a single-ended signal. Phone gain is set at gain 1 = 0.1 V/V, and the ring-tone  
gain is set to gain 2 = 2 V/V, the resistor values would be …  
Ri1 = 3 MΩ, and = RI2 = 150 kΩ.  
The high pass corner frequency of the single-ended input is set by CI2. If the desired corner frequency is less  
than 20 Hz.  
1
Ci2 > --------------------------…………………………………………………..(9)  
2π150kΩ 20Hz  
Ci2 > 53pF…………………………………………………………………..(10)  
Figure 19. Application Schematic With LY8005 Summing Differential and Sing-Ended Input  
Summing Two Single-Ended Input Signals  
Four resistors and three capacitors are needed for summing single-ended input signals. The gain and corner  
frequencies (fc1 and fc2) for each input source can be set independently (see equations Equation 11 through  
Equation 14, and Figure 20). Resistor, RP, and capacitor, CP, are needed on the IN+ terminal to match the  
impedance on the IN- terminal. The single-ended inputs must be driven by low impedance sources even if  
one of the inputs is not outputting an ac signal.  
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  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
VO  
150 kΩ  
Gain 1 = -------- = 2 X -------------------…………………………………………(11)  
VI1  
Vo  
Ri1  
150kΩ  
Gain 2 = --------- = 2 X -------------------………………………………………..(12)  
VI2  
Ri2  
1
Ci1 = -------------------…………………………………………………………...(13)  
2πRi1fc1  
1
Ci2 = -------------------……………………………………………………..…....(14)  
2πRi2fc2  
CP = Ci1 + Ci2…………………………………………………………………..(15)  
Ri1 x Ri2  
RP = ------------------…………………………………………………………..…(16)  
Ri1 + Ri2  
Figure 20. Application Schematic With LY8005 Summing Two Single-ended Input  
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  
19  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
PCB Layout  
All the external components must place very close to the LY8005. The input resistors need to be very close to  
the LY8005 input pins so noise does not couple on the high impedance nodes between the input resistors and  
the input amplifier of the LY8005. Then place the decoupling capacitor Cs, close to the LY8005 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 LY8005 should be as wide as  
possible to minimize trace resistance. If these traces are too thin, the LY8005'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  
20  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
LY8005UL Demo Board Artwork  
Top Silkscreen  
Top Layer  
Composite view  
Bottom Layer  
LY8005 V1.2 BOM List  
No.  
1
Description  
Reference  
Note  
Resistor, 150KΩ  
Capacitor, 0.1uF  
Capacitor, 0.22uF  
Capacitor, 10.0uF  
LY8005UL  
R1,R2,R3  
C3  
2
3
C1,C2  
C4  
4
5
U1  
6
1*2 Pin Header  
J1  
Close Æ Active  
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  
21  
®
LY8005  
2.3 W Mono Filterless Class D Audio power Amplifier (MSOP)  
Rev. 1.6  
PACKAGE OUTLINE DIMENSION  
8 pin 25.6 mil MSOP 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  
22  
厂商 型号 描述 页数 下载

LYONTEK

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 		LY8006BL 1.4 3W单声道无滤波器D类音频功率放大器（ MSOP / DFN ） - 兼容LY8890 / 8891 / 8891B单端输入[ 1.4 W Mono Filterless Class D Audio power Amplifier (MSOP / DFN) －Compatible with LY8890/8891/8891B Single-Ended Input ] 16 页

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LYONTEK

 		LY8010BL 为2.5W单声道无滤波器D类音频功率放大器（ WCSP封装/ DFN ）[ 2.5 W Mono Filterless Class D Audio power Amplifier (WCSP / DFN) ] 24 页

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 		LY8010CL 为2.5W单声道无滤波器D类音频功率放大器（ WCSP封装/ DFN ）[ 2.5 W Mono Filterless Class D Audio power Amplifier (WCSP / DFN) ] 24 页

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