Lyontek LY8897 2.7 watt audio power amplifier Datasheet

®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
FEATURES
GENERAL DESCRIPTION
„ 2.7W Into 4Ω from 5.0V power supply at
THD+N = 10% (Typ.).
„ 1.7W Into 8Ω from 5.0V power supply at
THD+N = 10% (Typ.)
„ 2.0V~5.5V Power supply.
„ Low shutdown current.(TYP.=0.05uA)
„ Low quiescent current.(TYP.=3.0mA)
„ Thermal shutdown protection with auto recovery
feature.
„ Advanced power ON/OFF pop reduction.
„ Lead free and green package available.
(RoHS Compliant)
„ Space Saving Package
-- 8-pin EMSOP package. (with thermal pad)
-- 8-pin MSOP package. (without thermal pad)
The LY8897 is a 2.7W audio power amplifier. It is
capable of driving 4Ω speaker load at a continuous
average output of 2.7W with less than 10%
distortion (THD+N) from a 5.0V power supply and
8Ω speaker load at a continuous average output of
1.7W with less than 10% distortion (THD+N) from a
5.0V power supply.
The LY8897 primarily designed for high quality
application in other portable communication device.
And the LY8897 audio amplifier features low power
consumption shutdown mode. It is achieved by
driving the shutdown pin with logic low.
And the LY8897 has an internal thermal shutdown
protection feature.
The LY8897 audio amplifier was designed
specifically to provide high quality output power with
a minimal amount of external components. The
LY8897 does not require output capacitors, and the
LY8897 is ideally suited for other low voltage
applications or portable electronic devices where
minimal power consumption is a primary
requirement.
APPLICATION
„
„
„
„
„
Boom Box.
Education, Toy.
MID,
Portable electronic devices.
Mobile Phones.
PIN CONFIGURATION
Power ON POP Noise
Power OFF POP Noise
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TEL: 886-3-6668838
FAX: 886-3-6668836
1
®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
PIN DESCRIPTION
SYMBOL
Pin No.
DESCRIPTION
EMSOP8
MSOP8
SHUTDOWN
1
1
Shutdown the device. (when LOW level is shutdown mode)
BYPASS
2
2
Bypass pin
+IN
3
3
Positive Input
-IN
4
4
Negative Input
Vo1(-)
5
5
Negative output
VDD
6
6
Power Supply
GND
7
7
Ground
Vo2(+)
8
8
Positive Output
ORDERING INFORMATION
Ordering
Code
Packing
Type
Speaker
Channels
Pin / Package
Output Power
(THD+N=10%)
Input
Type
Output
Type
LY8897XT
Tape &
Reel
Mono
EMSOP8
(with thermal pad)
2.7W/4Ω @5.0V_BTL
1.7W/8Ω @5.0V_BTL
SE/
DF
BTL
LY8897UT
Tape &
Reel
Mono
MSOP8
(without thermal pad)
2.7W/4Ω @5.0V_BTL
1.7W/8Ω @5.0V_BTL
SE/
DF
BTL
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2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
APPLICATION CIRCUIT
Figure 1. LY8897 application schematic with Single –Ended input
Figure 2. LY8897 application schematic with Differential input
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2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Operating Temperature
Input Voltage
Storage Temperature
Power Dissipation
ESD Susceptibility
Junction Temperature
Soldering Temperature (under 10 sec)
SYMBOL
VDD
TA
VI
TSTG
PD
VESD
TJMAX
TSOLDER
RATING
6.0
-40 to 85 (I grade)
-0.3V to VDD +0.3V
-65 to 150
Internally Limited
2000
150
260
UNIT
V
℃
V
℃
W
V
℃
℃
DC ELECTRICAL CHARACTERISTICS (TA=25℃)
*2
SYMBOL
TEST CONDITION
MIN.
TYP.
PARAMETER
Power supply voltage
VDD
-2.0
Quiescent Current
IQ
VDD=5.0V, Load=4Ω.
3.0
Shutdown Current
ISD
VDD=5.0V, VSD=0V
0.05
Shutdown Voltage Input High
VSDIH
VDD=5.0V, VSD Mode = VDD
1.2
Shutdown Voltage Input Low
VSDIL
VDD=5.0V, VSD Mode = GND
Output Offset Voltage
VOS
VDD=5.0V, Load=4Ω.
7.0
(*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℃
MAX.
5.5
9.0
2.0
0.4
50.0
UNIT
V
mA
µA
MAX.
UNIT
V
mV
OPERATING CHARACTERISTICS(1) (TA=25℃)
*2
TEST CONDITION
MIN.
TYP.
Vripple = 200mV
1KHz
68.77
sine p-p, VDD=5.0V,
RL=4Ω, Av=2.
217Hz
55.60
Input=GND.
Power Supply Rejection Ratio
PSRR
Vripple = 200mV
1KHz
68.31
sine p-p, VDD=5.0V,
RL=4Ω, Av=2.
217Hz
67.73
Input=Floating.
A-weight
94.26
VDD=5.0V,RL=8Ω, ing
Signal-to-noise ratio
SNR Input=GND, Av=2, None
1W=0dB,
A-weight
91.78
ing
A-weight
38.7
VDD=5.0V,Av=2,
ing
f=20Hz~20KHz,
Output voltage noise
Vn
None
Input=GND,
A-weight
51.5
RL=4Ω SPK,
ing
Shutdown temp.
160
TSD
Thermal shutdown temperature
Restore temp.
130
(*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℃
PARAMETER
SYMBOL
Lyontek Inc. reserves the rights to change the specifications and products without notice.
2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
4
-
dB
dB
uV
-
℃
®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
OPERATING CHARACTERISTICS(2) (TA=25℃)
SYMBOL
TEST CONDITION
*2
MIN.
TYP.
MAX. UNIT
3.3
VDD=5.5V
*3
2.7
VDD=5.0V
RL=4Ω
1.5
VDD=3.7V
THD=10%,f=1 kHz VDD=2.5V
0.6
0.37
VDD=2.0V
2.5
VDD=5.5V
*3
2.0
VDD=5.0V
RL=4Ω
1.1
VDD=3.7V
0.5
THD=1%,f=1 kHz VDD=2.5V
0.24
VDD=2.0V
Output Power
Po
W
2.0
VDD=5.5V
1.7
VDD=5.0V
RL=8Ω
1.0
VDD=3.7V
THD=10%,f=1 kHz VDD=2.5V
0.4
0.25
VDD=2.0V
1.6
VDD=5.5V
1.3
VDD=5.0V
RL=8Ω
0.7
VDD=3.7V
THD=1%,f=1 kHz VDD=2.5V
0.3
0.2
VDD=2.5V
(*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) When driving 4Ω loads from 4.2V~5V power supply, the device must be mounted to a circuit board.
PARAMETER
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2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 3
THD+N vs. Output Power (@ RL=4Ω, f=1kHz, AV=10)
Figure 4
THD+N vs. Output Power (@ RL=8Ω, f=1kHz, AV=10)
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2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
Figure 5
Power Supply Rejection Ratio (PSRR)
Figure 6
Frequency response
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TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
Figure 7
SNR vs. Noise Level
SD Current vs. SD Voltage
Quiescent Current vs. Supply voltage
SHUTDOWN CURRENT vs SHUTDOWN VOLTAGE
QUIESCENT CURRENT vs SUPPLY VOLTAGE
1
5
2.5V
0.9
3.7V
No Load
5.0V
8Ω
I(Q) - Quies c ent Current - m A
I(SD) Shutdown Current - uA
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
4Ω
3
2
1
2.0
0
0
4
2.5
3.0
3.7
4.2
VDD - Supply Voltage - V
Shutdown Voltage - V
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2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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5.0
5.5
6.0
®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
VDD Current vs. Output Power (RL=4Ω)
VDD Current vs. Output Power (RL=8Ω)
SUPPLY CURRENT vs OUTPUT POWER(RL=8Ω)
SUPPLY CURRENT vs OUTPUT POWER(RL=4Ω)
1000
500
2.0V
2.5V
3.7V
5.0V
900
800
400
S u p p ly C u rre n t - m A
700
S upply C urrent-m A
2.0V
2.5V
3.7V
5.0V
450
600
500
400
300
350
300
250
200
150
200
100
100
50
0
0
0
0.2
0.4 0.8
1 1.2 1.8 2.2 2.4 2.6 2.8
Po-Output Power-W(RL=4Ω)
3
0
3.2 3.4
0.2
0.4
0.8
1
1.2
Load Resistance vs. Output Power (THD+N=10%)
Load Resistance vs. Output Power (THD+N=1%)
Output Power vs Load Resistance (THD+N=10)
Output Power vs Load Resistance (THD+N=1%)
3.50
3.00
2.5V
2.5V
3.00
3.7V
3.7V
2.50
5V
P o- 10 % O utput P ow er
4.2V
2.00
5.5V
1.50
1.00
P o- 1 % O utput P ow er
5V
2.50
4.2V
2.00
5.5V
1.50
1.00
0.50
0.50
0.00
0.00
4Ω
8Ω
12Ω
16Ω
20Ω
24Ω
28Ω
32Ω
4Ω
8Ω
12Ω
16Ω
VDD vs. Output Power (RL=4Ω)
24Ω
28Ω
32Ω
VDD vs. Output Power (RL=8Ω)
OUTPUT POWER vs. SUPPLY VOLTAGE(4Ω)
OUTPUT POWER vs. SUPPLY VOLTAGE((8Ω)
2.5
3.5
THD+N=10%
THD+N=10%
THD+N=1%
2
Po-Output Power
3
20Ω
Load Resistance
Load Resistance
Po-Output Power
1.8
Po - Output Power - W(RL=8Ω)
2.5
2
1.5
THD+N=1%
1.5
1
1
0.5
0.5
0
2.0V
2.5V
3.7V
4.2V
5V
0
2.0V
5.5V
2.5V
3.7V
4.2V
VDD-Supply Voltage-V
VDD-Supply Voltage-V
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TEL: 886-3-6668838
FAX: 886-3-6668836
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5V
5.5V
®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
Output Power vs. Temperature
Lyontek Inc. reserves the rights to change the specifications and products without notice.
2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
APPLICATION INFORMATION
Bridged configuration explanation
As shown in Figure 1 and 2, the LY8897 has two operational amplifiers internally, allowing for a few different
amplifier configurations. The first amplifier’s gain is externally configurable, while the second amplifier is
internally fixed in a unity-gain, inverting configuration. The closed-loop gain of the first amplifier is set by
selecting the ratio of Rf to RIN while the second amplifier’s gain is fixed by the two internal 20kΩ resistors.
Figure 1 and 2 shows that the output of amplifier one serves as the input to amplifier two which results in both
amplifiers producing signals identical in magnitude, but out of phase by 180°. Consequently, the differential
gain for the IC is
AVD= 2 X ( Rf / RIN ) ………………………………………………………………(1)
By driving the load differentially through outputs Vo1 and Vo2, an amplifier configuration commonly referred to
as “bridged mode” is established. Bridged mode operation is different from the classical single-ended
amplifier configuration where one side of the load is connected to ground.
A bridge amplifier design has a few distinct advantages over the single-ended configuration, as it provides
differential drive to the load, thus doubling output swing for a specified supply voltage. Four times the output
power is possible as compared to a single-ended amplifier under the same conditions.
This increase in attainable output power assumes that the amplifier is not current limited or clipped. In order to
choose an amplifier’s closed-loop gain without causing excessive clipping, please refer to the Audio Power
Amplifier Design section.
A bridge configuration, such as the one used in the LY8897, also creates a second advantage over single
-ended amplifiers. Since the differential outputs, Vo1 and Vo2, are biased at half-supply, no net DC voltage
exists across the load. This eliminates the need for an output coupling capacitor which is required in a single
supply, single-ended amplifier configuration. Without an output coupling capacitor, the half-supply bias across
the load would result in both increased internal IC power dissipation and also possible loudspeaker damage.
Input Capacitors (Ci)
The LY8897 input capacitors and input resistors form a high-pass filter with the corner frequency, fc,
determined in equation Equation 2.
1
fc = ----------------………………………………………………………………(2)
2πRiCi
Equation 3 is reconfigured to solve for the input coupling capacitance.
1
Ci = -----------------…………………………………………………………….(3)
2πRifc
For example
In the table 1 shows the external components. Rin in connect with Cin to create a high-pass filter.
Reference
Ri
Ci
corner frequency
Table 1. Typical Component Values
Description
Note
20KΩ
1% tolerance resistors
0.1uF
0.22uF
0.33uF
0.47uF 80%/–20% non polarized
79.57Hz 36.17Hz 20.4Hz 16.93Hz
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2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
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®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
Ci = 1 / ( 2πRifc)
Ci = 1 / ( 2π x20KΩ x20Hz)=0.1uF，One would likely choose a value of 0.1uF as this value is commonly used.
Note that it is important to Ci must be 10 times smaller than the bypass capacitor to reduce clicking and
popping noise from power on/off and entering and leaving shutdown. After sizing Ci for a given cutoff
frequency, size the bypass capacitor to 10 times that of the input capacitor.
Ci ≦ Cbypass / 10
Bypass Capacitor Value Selection
Besides minimizing the input capacitor size, careful consideration should be paid to value of Cbypass, the
capacitor connected to the BYPASS pin. Since Cbypass determines how fast the LY8897 settles to quiescent
operation, its value is critical when minimizing turn-on pops. The slower the LY8897’s outputs ramp to their
quiescent DC voltage (nominally 1/2 VDD), the smaller the turn-on pop. Choosing Cbypass value equal 1.0 to
10 uF along with a small value of Ci (in the range of 1 nF to 0.39 μF), produces a click-less and pop-less
shutdown function. As discussed above, choosing Ci no larger than necessary for the desired bandwith helps
minimize clicks and pops. Therefore, increasing the bypass capacitor reduces clicking and popping noise
from power on/off and entering and leaving shutdown. To have minimal pop, Cbypass should be 10 times
larger than Ci.
Cbypass ≧ Ci x 10
PARAMETER
Start-up time
from shutdown
Table 2. CBYPASS Reference Component Values
SYMBOL
TEST CONDITION
MIN.
TYP.
940
Cbypass = 10μf
VDD=5.0V,
Cbypass = 4.7μf
550
Ci=0.1uF,
Ri=20KΩ,
Cbypass = 2.2μf
190
Av=10
Cbypass = 1.0μf
158
ZI
780
Cbypass = 10μf
VDD=3.7V,
Cbypass = 4.7μf
480
Ci=0.1uF,
Ri=20KΩ,
Cbypass = 2.2μf
180
Av=10
Cbypass = 1.0μf
126
MAX.
-
UNIT
ms
Power Supply Bypassing Capacitor
As with any amplifier, proper supply bypassing is critical for low noise performance and high power supply
rejection. The capacitor location on both the bypass and power supply pins should be as close to the device
as possible.
The LY8897 is a mono class AB 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 ceramic capacitor or electrolytic capacitors,
typically 10~220uF, placed as close as possible to the device VDD lead works best. Placing 0.1uF decoupling
capacitor close to the LY8897 is very important for the efficiency of the class AB amplifier, because any
resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency and
protect device damage. 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.
Lyontek Inc. reserves the rights to change the specifications and products without notice.
2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
Shutdown Function
When the LY8897 not in use. The device will be to turn off the amplifier to reduce power consumption. When
logic low is applied to the shutdown pin, this shutdown feature will turns the amplifier off. By switching the
shutdown pin connected to GND, the device supply current draw will be minimized in idle mode. The pin
cannot be left floating due to the internal did not pull-up.
Over-Heat Protection
The LY8897 has a built-in over-heat protection circuit , it will turn off all power output when the chip
temperature over 160℃, the chip will return to normal operation automatically after the temperature cool down
to 130℃.
PCB LAYOUT
All the external components must place very close to the LY8897. The input resistors need to be very close to
the LY8897 input pins so noise does not couple on the high impedance nodes between the input resistors and
the input amplifier of the LY8897. Then place the decoupling capacitor Cs, close to the LY8897 is important
for the efficiency of the class AB 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 LY8897 should be as wide as
possible to minimize trace resistance. If these traces are too thin, the LY8897'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.
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2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8897
Rev. 1.2
„
2.7 Watt Audio Power Amplifier
DEMO BOARD INFORMATION
Demo Board Application Circuit :
Figure 8. LY8897 Demo Board Application Circuit
Demo Board BOM List :
LY8897 V2.0 BOM List (Stereo Mode)
No.
Description
1
Resistor, 20KΩ
2
Resistor, 100KΩ
3
Capacitor, 0.1uF
4
Capacitor, 1.0uF
Reference
R1, R4A
(R2,R3 DF input only)
R5
C1, C4
(C2 DF input only)
C3
5
6
7
Capacitor, 10.0uF
IC
1*2 Pin Header
C5
U1
J1
Note
1/16W,1%
1/16W,1%
80%/−20%, non polarized
80%/−20%, non polarized
25V,105℃,8x11,EC Cap.
LY8897X or LY8897U
Pitch 2.54 mm
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TEL: 886-3-6668838
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®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
Demo Board Artwork :
Top Silkscreen
Top Layer
Composite view
Bottom Layer
(*3) When driving 4Ω loads from 4.2V~5V power supply, the device must be mounted to a circuit board.
Lyontek Inc. reserves the rights to change the specifications and products without notice.
2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
15
®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
PACKAGE OUTLINE DIMENSION
8 Pin 118mil EMSOP Package Outline Dimension
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TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8897
Rev. 1.2
2.7 Watt Audio Power Amplifier
8 pin 118mil MSOP Package Outline Dimension
Lyontek Inc. reserves the rights to change the specifications and products without notice.
2F, No. 17, lndustry E . Rd. II, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
17