IS31AP4066D Class-AB Audio Amplifier Evaluation Board Guide
Description
The IS31AP4066D evaluation board is a fully
assembled and tested PCB that uses the
IS31AP4066D Class-AB stereo, bridge-tied-load audio
amplifier. The chip is designed to drive speakers with
impedance of 8Ω or larger. The evaluation board
provides dual BTL output channels, capable of
delivering 1.6W into an 8Ω speaker at 5V.
Recommended Equipment
5.0V, 2A power supply
Audio signal input source (Media player, Etc.)
Speakers rated at 8Ω or 4Ω resistive load.
Note: Speakers not supplied with EVB
Absolute Maximum Ratings
VDD
≤
5.5V power supply
Caution: Exceeding the maximum ratings will lead to possible
board damage.
Features
Supply voltage range from 2.7V to 5.5V
Delivers 2.6W with 4Ω load at 5V supply.
(THD+N)=10%
Delivers 1.8W with 8Ω load at 5V supply.
(THD+N)=10%
Available in MSOP-8 & DFN-8 packages
Procedure
The IS31AP4066D evaluation board can be used to
verify device operation via the following procedures:
Caution: Do not turn on the power supply until all connections
are completed.
Quick Start Guide
1. Connect a 4Ω (or larger) speaker across the OUT-
terminal and OUT+ terminal.
2. Connect the ground terminal of the power supply to
the GND and the positive terminal to the VCC. You
may also connect DC IN to a DC supply.
3. If the audio source is differential, remove jumper
JP1, connect the negative of the audio source to
the IN- terminal, and connect the positive of the
audio source to IN+ terminal.
4. If the audio source is single-ended, connect the
audio source to the IN+ terminal, and close jumper
JP1; or connect audio source to the audio
connector (AUDIO IN) and close jumper JP1.
5. Turn on the power supply.
6. Turn on the audio source.
Figure 1. Photo of IS31AP4066D Evaluation Board
Ordering Information
Part No.
IS31AP4066D-QFLS2-EB
Temperature Range
-40°C to +85°C (Industrial)
Table 1. Ordering Information
IC Package
QFN-16, Lead-free
For further information regarding orders, prices and delivery methods, please contact
ISSI at
analog_mkt@issi.com
or (408) 969-6600.
Integrated Silicon Solution, Inc. – www.issi.com
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IS31AP4066D Class-AB Audio Amplifier Evaluation Board Guide
Evaluation Board Operation
This evaluation board features the IS31AP4066D
Class-AB stereo audio amplifier IC, which is ideal for
driving speakers with internal impedances of 8Ω.
High-pass Filter Configuration
The input capacitors C3 & C4 and input resistors R1 &
R2 form a high-pass filter. The corner frequency can
be calculated via Equation (2).
Gain Configuration
The IS31AP4066D evaluation board ships with a
default gain of 18.3dB. The amplitude of the gain can
be adjusted by changing the values of R1, R2, R3, and
R4. The following equation can be utilized to determine
the proper resistance values for achieving desired gain
results.
f
½
c
2
R C
I I
1
(2)
Shutdown-mode
Jumper (JP2) controls the shutdown behavior of
IS31AP2005. Connect the shunt across pin 1 and 2 of
the jumper (JP2) to enter shutdown mode.
Gain
½
2
150k
R
I
(1)
R3
82K
VCC
C1
10uF
C3
0.1uF
CLOSE=SD
11
2
15
SD
0.1uF
C2
R5
100K J1
VCC
INA
15nF
20K
C4
4
VDD
VDD
C5
R1
INA
-OUTA
+OUTA
3
1
SPEAKER
8
1uF
BYPASS
U1
+OUTB
12
10
SPEAKER
C6
INB
15nF
R2
20K
INB
GND
GND
GND
GND
GND
GND
5
6
7
13
14
16
R4
82K
9
-OUTB
IS31AP4066D
Figure 2: Schematic of IS31AP4066D within Evaluation Board
Bill of Materials
No.
1
2
3
4
5
6
7
8
Name
IC
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Description
Class-AB Stereo Amp
20kΩ
82kΩ
100kΩ
10μF
0.1μF
1μF
15nF
Symbol
U1
R1,R2
R3, R4
R5
C1
C3, C2
C4
C6, C5
Qty
1
2
2
1
1
2
1
2
Manufacturer P/N
IS31AP4066D
Table 2: Bill of Materials; Refer to Figure 2 for additional information
Integrated Silicon Solution, Inc. – www.issi.com
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IS31AP4066D Class-AB Audio Amplifier Evaluation Board Guide
0
2
2
0
1
1
2
1
3
2
1
1
2
1
2
1
2
1
1
2
2
1
2
1
1
1
2
2
2
0
0
Figure 3. Board Component Placement Guide -Top Layer
Figure 4. Board PCB Layout- Top Layer
Integrated Silicon Solution, Inc. – www.issi.com
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IS31AP4066D Class-AB Audio Amplifier Evaluation Board Guide
0
2
2
0
1
1
2
1
3
2
1
1
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1
2
1
2
1
1
2
2
1
2
1
1
1
2
2
2
0
0
Figure 5.. Board Component Placement Guide -Bottom Layer
Figure 6. Board PCB Layout-Bottom Layer
Integrated Silicon Solution, Inc. – www.issi.com
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IS31AP4066D Class-AB Audio Amplifier Evaluation Board Guide
Copyright © 2011 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification
and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products
or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any
published information and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or
malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety
or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written
assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com
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