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 8
Ω
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 8
Ω
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
8
Ω
speaker
ABSOLUTE MAXIMUM RATINGS
≤
4.5V power supply
Caution: Do not exceed the conditions listed above; otherwise
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 8
Ω
(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
or (408) 969-660.
