A2331 [AITSEMI]
ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER;
| 型号： | A2331 |
| 厂家： | 
AiT Semiconductor |
| 描述： | ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER 放大器 功率放大器 |
| 文件： | 总10页 (文件大小：334K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A2331
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
3W ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER
DESCRIPTION
FEATURES
A2331 is a 3-W (VDD=5.0V, RL=4Ω) high efficiency
filter-free class-D audio power amplifier in a wafer
chip scale package.
Output Power
-3.0W (VDD=5.0V, RL =4Ω, THD+N=10%)
-1.8W (VDD=5.0V, RL =8Ω, THD+N=10%)
Four mode can be selected with CTRL
terminal: Anti-Clip 1, Anti-Clip 2, Anti-Clip off,
Power-Down
A2331 has a ꢀProfessional Anti-Clip output control
circuitꢁ which reducing distortion of output signal
due to either the over level input signal or power
supply voltage down with battery.
Low THD+N and Low Noise
Low EMI
Features like high efficiency, −80dB PSRR, over
current protection and thermal protection function
make the A2331 ideal for cellular handsets.
Improved PSRR (−80dB) and Wide Supply
Voltage (2.5 V to 5.0V) Eliminates Need for a
Voltage Regulator
Over-current and Thermal Protection function
Pop noise reduction function
Available in CSP9 Package
The A2331 is available in CSP9 package.
ORDERING INFORMATION
APPLICATION
Mobile phone, PDA
MP3/4, PMP, GPS
Package Type
CSP9
Part Number
A2331G9R
A2331G9VR
Portable electronic devices
G9
TYPICAL APPLICATION
V: Halogen free Package
R: Tape & Reel
Note
SPQ:3,000pcs/Reel
AiT provides all RoHS products
Suffix ꢀ V ꢀ means Halogen free Package
REV2.0
- AUG 2011 RELEASED, JAN 2016 UPDATED -
- 1 -
A2331
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
3W ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER
PIN DESCIPTION
TOP VIEW
Pin #
A1
Symbol
IN+
Functions
Positive differential input
Power Supply
A2
VDD
A3
VO+
GND
VREF
PGND
IN-
Positive BTL output
Analog Ground
B1
B2
Bypass capacitor connected
Power Ground
B3
C1
C2
C3
Negative differential input
Mode select
CTRL
VO-
Negative BTL output
REV2.0
- AUG 2011 RELEASED, JAN 2016 UPDATED -
- 2 -
A2331
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
3W ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER
ABSOLUTE MAXIMUM RATINGS
Over operating free-air temperature, unless otherwise noted
VDD, Supply Voltage
-0.3V~5.2V
-0.3V~VDD+0.3V
-40°C~120°C
-40°C~150°C
-65°C~150°C
300°C, 5sec
VI, Input Voltage
TA, Operation Free-air Temperate Range
TJ, Operation Free-air Junction Temperature
TSTG, Storage Temperature Range
TSLD, Soldering Temperature
Stresses above may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any
other conditions beyond those indicated in the Electrical Characteristics are not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Parameter
Power Supply Voltage
Symbol
VDD
Min
2.5
-20
4
Typ.
Max
5.0
85
-
Unit
V
-
-
-
Operating Ambient Temperature
Speaker Impedance
TA
℃
Ω
RL
REV2.0
- AUG 2011 RELEASED, JAN 2016 UPDATED -
- 3 -
A2331
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
3W ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER
ELECTRICAL CHARACTERISTICS
VDD =2.5V to 5V, TA =25°C, unless otherwise noted.
Parameter Symbol
DC Characteristics
Power Supply Start-Up Threshold Voltage
Power Supply Shut-Down Threshold Voltage VUVLL
Conditions
Min.
Typ. Max. Unit
VUVLH
2.5
1.8
V
V
V
V
V
Anti-Clip1 Mode Setting Threshold Voltage
Anti-Clip2 Mode Setting Threshold Voltage
VMOD1
VMOD2
1.3
0.85
0.5
VDD
1.15
0.72
Anti-Clip Off Mode Setting Threshold Voltage VMOD3
Power-Down Mode Setting Threshold
VMOD4
VSS
0.14
V
Voltage
VDD=3.6V, no load,
no signal input
CTRL<0.2V
Consumption Current
IDD
5
mA
Consumption Current in Power-Down Mode
VREF Voltage
IPD
1
µA
VREF
VDD/2
V
AC Characteristics
Start-Up Time
tSTUP
fc
VDD=5V,Vr=1uF
CIN-33nF,Av=17.5dB
VDD=5V,g=10dB
VDD=5V,g=10dB
VDD=5V,g=10dB
VDD=5V,g=10dB
38
120
45
ms
Hz
ms
s
Input Cut-Off Frequency
Attack Time 1
tAT1
TRL1
tAT2
TRL2
Release Time 1
3.1
10
Attack Time 2
ms
s
Release Time 2
1.8
Each Mode Setting Time(Except Power Down) tMOD
Analog Characteristics
0.1
ms
VDD =3.6V, AV=17.5dB,TA =25°C, CIN=100nF, Anti-Clip off, unless otherwise noted.
RL=4Ω,VDD=5V f=1KHz,
3
W
W
Maximum Output
PO
THD+N= 10%
RL=8Ω,VDD=5V
1.8
0.08
0.06
60
RL=4Ω, PO =0.65W, f=1KHz
RL=8Ω, PO =0.65W, f=1KHz
Av=17.5dB A-Weighted
Av=17.5dB A-Weighted
217Hz
%
Total Harmonic Distortion Rate
THD+N
%
Residual Noise
N
µVrms
dB
dB
%
Signal/Noise Ratio
SNR
PSRR
95
Power Supply Rejection Ratio
-80
85
RL=8Ω, PO =0. 6W
Maximum Efficiency
η
RL=8Ω, PO =0. 1W,
80
%
Output Offset Voltage
Frequency Characteristics
Closed Loop Gain
Vo
fRES
Gv
±10
mV
dB
dB
CIN=0.1µF, f=100Hz to 20KHz
-3
1
VDD=5V Anti-Clip Off
17.5
REV2.0
- AUG 2011 RELEASED, JAN 2016 UPDATED -
- 4 -
A2331
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
3W ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER
BLOCK DIAGRAM
REV2.0
- AUG 2011 RELEASED, JAN 2016 UPDATED -
- 5 -
A2331
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
3W ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER
DESCRIPTION
Application Information
Anti-Clip Control Function
This is the function to control the output in order to obtain a maximum output level without distortion when an excess
input which causes clipping at the differential signal output is applied. That is, with the Anti-Clip function, A2331
lowers the Gain of the amplifier to an appropriate value so as not to cause the clipping at the differential signal output.
And, A2331 follows also to the clip of the output wave form due to the decrease in the power-supply voltage.
The Attack time and the release time of Anti-Clip control are fixation two levels, and selects with the CTRL terminal.
The Attack time is a time interval until from gain falls to target attenuation gain -3dB with a big signal input enough.
And the Release time is a time from target attenuation gain to not working of Anti-Clip.
Attack time and Release time
Anti-Clip mode
1(Recommendation)
2
Attack time
45ms
Release time
3.1s
10ms
1.8s
Over-current Protection function
This is the function to establish the over-current protection mode when detecting a short circuit between A2331
differential output terminal and VSS, VDD, or another differential output. In the over current protection mode, the
differential output terminal becomes a high impedance state. Once the short is removed, the device will be
reactivated.
Thermal Protection function
Thermal protection on the A2331 prevents damage to the device when the internal die temperature exceeds 150℃.
There is a ±20℃ tolerance on this trip point from device to device. Once the die temperature exceeds the thermal
set point, the outputs are disabled. This is not a latched fault. The thermal fault is cleared once the temperature of the
die is reduced by 20℃. The device begins normal operation at this point with no external system intervention.
Under Voltage Lock-out (UVLO)
The A2331 incorporates circuitry designed to detect low supply voltage. When the supply voltage drops to 1.8V or
below, the A2331 outputs are disabled, and the device comes out of this state and starts to normal function when
VDD≧2.5V.
REV2.0
- AUG 2011 RELEASED, JAN 2016 UPDATED -
- 6 -
A2331
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
3W ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER
VREF terminal output
The voltage of VDD/2 is output from the VREF terminal. Capacitor (1uF) is connected between the VREF terminal and
GND for stabilization.
Power down and Initialization function
When CTRL terminal is connected to the GND potential, the IC goes to the power-down mode. In the mode, all the
circuit functions stop and its current consumption becomes the lowest.
When CTRL terminal is set to H level, the power-down mode is canceled and the IC starts up after startup time
(tSTUP).
In order to return from the power-down mode a desired mode needs to be set after setting both CTRL1 and CTRL2 to
H level during tWK. In addition, at startup, cancel the power-down mode after supply voltages has been sufficiently
stabilized.
CTRL terminal function
By connection external resistors (Rctrl1, Rctrl2, and Rctrl3: Accuracy of 1%) to CTRL terminal, and impression
setting threshold voltage of each mode to CTRL terminal, the followings can be set: Anti-Clip1, Anti-Clip2, Anti-Clip
OFF, and power-down mode. When turning on the supply voltage or cancelling the power-down mode, control the
CTRL terminal according to the procedure for cancelling power-down.
Connect the terminal to the ground through a capacitor Cctrl (a ceramic capacitor of 0.1μF or more)
CTRL1
H
CTRL2
H
Function
Anti-Clip 1 mode
Anti-Clip 2 mode
Anti-Clip off mode
Power-down mode
H
GND
H
GND
GND
GND
REV2.0
- AUG 2011 RELEASED, JAN 2016 UPDATED -
- 7 -
A2331
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
3W ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER
ꢀHꢁ level indicates a microcomputer’s I/O port H level output voltage that is input to CTRL1 and CTRL2 terminals and
GND indicates GND of the microcomputer.
GND level of the microcomputer must be the same as that of A2331.
The control of CTRL terminal is based on I/O port H level output voltage of microcomputer that is connected.
Set resistance constants according the I/O port H level output voltage of each microcomputer as shown below.
I/O port H level output voltage
1.8V
2.6V
3.0V
3.3V
5.0V
of Microcomputer
Rctrl1
27KΩ
43KΩ
82KΩ
33KΩ
51KΩ
27KΩ
33KΩ
51KΩ
22KΩ
33KΩ
51KΩ
18KΩ
56KΩ
82KΩ
15KΩ
Rctrl2
Rctrl3
Functions of CTRL pin are designed with their control by two control pins (CTRL1 and CTRL2)
Only a Switching control between Anti-Clip1 mode and Power-down is available when a single control terminal used.
A setting voltage should be set according to VMOD1 and VMOD4, and use a RC filter with time constant of 1msec or
more in order to eliminate noise at transmission side such as Micon etc. (Example. Rctrl1=10KΩ and Cctrl=0.1μF).
CTRL1
H
Function
Anti-Clip 1 mode
Power-down mode
GND
POP and Click Circuitry
The A2331 contains circuitry to minimize click and pops. For the best power-off pop performance, the amplifier
should be set in shutdown mode prior to removing the power supply voltage.
REV2.0
- AUG 2011 RELEASED, JAN 2016 UPDATED -
- 8 -
A2331
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
3W ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER
PACKAGE INFORMATION
Dimension in CSP9 (Unit: mm)
REV2.0
- AUG 2011 RELEASED, JAN 2016 UPDATED -
- 9 -
A2331
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
3W ANTI-CLIP CLASS-D AUDIO POWER AMPLIFIER
IMPORTANT NOTICE
AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to discontinue any
integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant
information to verify, before placing orders, that the information being relied on is current.
AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to be
suitable for use in life support applications, devices or systems or other critical applications. Use of AiT products in
such applications is understood to be fully at the risk of the customer.
death, personal injury, or servere property, or environmental damage.
As used herein may involve potential risks of
In order to minimize risks associated with
the customer's applications, the customer should provide adequate design and operating safeguards.
AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT warrants the
performance of its products of the specifications applicable at the time of sale.
REV2.0
- AUG 2011 RELEASED, JAN 2016 UPDATED -
- 10 -
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