ISSI IS31AP2031-QFLS2-EB User Manual
IS31AP2031 CLASS-K AUDIO POWER AMPLIFIER
EVALUATION BOARD GUIDE
Integrated Silicon Solution, Inc. – www.issi.com 1
Rev. C, 01/22/2017
DESCRIPTION
The IS31AP2031 is a Class-K audio power amplifier
with automatic gain control. It drives up to 2.0W (10%
THD+N) into an 8Ω speaker from a 4.2V VCC supply.
The IS31AP2031 provides low cost, space saving
solution for portable equipments which need audio
output with higher power by boosting up supply voltage.
Its external components just include a few capacitors
and resistors (no inductor). The IS31AP2031 use fully
differential design to reduce RF noise. The
IS31AP2031 integrates de-pop circuitry to reduce pop
and click noise during power on/off or shutdown enable
operation. The IS31AP2031 also integrates thermal
and short circuit protection function.
FEATURES
Operates from 2.7V to 4.5V
2.0W into an 8Ω load from a 4.2V supply (10%
THD+N)
4 gain levels: 12dB, 16dB, 24dB, 27.5dB
AGC function
Pulse Count Control serial interface
8kV HBM ESD
Thermal and short-circuit protection
Available in QFN-20 (3mm × 3mm).
QUICK START
Figure 1: Photo of IS31AP2031 Evaluation Board
RECOMMENDED EQUIPMENT
≤ 4.5V, 2A power supply
Audio source (i.e. MP3 player, Notebook PC, etc.)
An 8Ω speaker
ABSOLUTE MAXIMUM RATINGS
≤ 4.5V power supply
Caution: Do not exceed the conditions listed above; otherwi se
the board will be damaged
PROCEDURE
The IS31AP2031 demo board is fully assembled and
tested. Follow the steps listed below to verify board
operation.
Caution: Do not turn on the power supply until all connections
are completed.
1) Connect an 8Ω (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.
Or connect DC power to connector (DC IN).
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, and pay attention to the
supply current. If the current exceeds 1.5A,
please check for circuit fault.
6) Turn on the audio source.
ORDERING INFORMATION
Part No. Temperature Range Package
IS31AP2031-QFLS2-EB -40°C to +85°C (Industrial) QFN-20, Lead-free
Table 1: Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at
analog@issi.com
or (408) 969-660.
IS31AP2031 CLASS-K AUDIO POWER AMPLIFIER
EVALUATION BOARD GUIDE
Integrated Silicon Solution, Inc. – www.issi.com 2
Rev. C, 01/22/2017
PERFORMANCE DESCRIPTION
The IS31AP2031 evaluation board has four buttons to
switch between the different modes. The operating
mode is indicated by an LED illuminated above the
appropriate buttons. The modes listed as below:
1) Mode1: gain level 12dB AGC OFF.
2) Mode2: gain level 16dB AGC ON.
3) Mode3: gain level 24dB AGC OFF.
4) Mode4: gain level 27.5dB: AGC ON.
5) Shutdown mode: close Jumper (JP2) enter
shutdown mode.
Note: IS31AP2031 Audio Amplifier provides solely the Audio
function on the evaluation board.
SOFTWARE SUPPORT
Please refer to the integrated program.
Note: The Jumper JP3 is closed by default, if the JP3 is open,
the MCU will stop functioning, the SDB pin of the chip in a h igh
impedance state. The external MCU can be used to control the
board SD (TP7) point.
Please refer to the datasheet to get more information about
IS31AP2031.
P0.0
1
P1.7
2
P1.6
3
RST
4
GND
5
OSC 1
6
OSC 2
7
INT1/P1.4
8
INT0/P1.3
9
T0/P1.2
10
RXD/P1.1
11
TXD/P1.0
12
T1/P0.7
13
P0.1
20
P0.2
19
P0.3
18
P0.4
17
P0.5
16
VDD
15
P0.6
14
U3
LPC922
K427.5dB AGC ON
K324dB AGC OFF
K216dB AGC ON
K112dB AGC OFF
D2
D3
D4
D1
R8
1K
R9
1K
R7
1K
3V
1uF
C2
4.7uF
C5
10uF
C6
C3
15nF
C4
15nF
0.1uF
C7
R1
10K
R2
10K
Speaker
100K
R3
VCC
CLOSE= SE
JP1
R10
100K
R13
100K
R12
100K
R11
100K
R6
1K
VDD
4,8
SDB
1
IN-
6
IN+
7
FS
9
AVIN
12,17,18
CP
3
CN
19
OUT+
15
OUT-
13
GND
14,20
U1
IS31AP2031
VDD
1
GND
2
SD
3
BP
4
VOUT
5
U2
LDO
C8
1uF
C10
1uF
C9
10nF
VCC 3V
VCC
SDB
SDB
LED1
LED2
LED3
LED4LED1
LED2
LED3
LED4
R4
NC
R5
100K
SD
TP7
CLOSE= SD
JP2
VCC
3V
OPEN=EXT CTRL
JP3
TP3
TP4
IN-
IN+
OUT+
TP5
OUT-
TP6
CON3
SPK
VCC
C1
10uF
CON1
DC IN
TP1
TP2
CON2
AUDIO IN
1
2
3
4
5
TP8
ICP
3V
P0.5
P0.4
RST
GND
RST
P0.5
P0.4
Figure 2: IS31AP2031 Application Schematic
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