Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
3CH, 2.2W, Class-D Audio Power Amplifier
PT2002
DESCRIPTION
The PT2002 is a Class-D power amplifier designed for audio equipments, maximum output power can
reach up to 2.2W x 3CH (VDD = 5V, RL = 4Ω, THD = 10%). The PT2002 composed of exclusively
designed Class-D circuitry (patented) by PTC, along with the most advanced semi-conductor
technology. Compare with traditional Class-AB amplifiers, the PT2002 performs much better power
efficiency (>80%), less heat dissipation, and produces superior audio quality. External circuitry is very
simple and flexible, and consists of flawless self-protection capabilities. The chip’s packaging is small,
thus it occupies an insignificant amount of space on the circuit board; therefore, making it the
predominant choice when it comes to audio amplifiers.
FEATURES
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CMOS technology
3 channels, differential analog input
Maximum output power 2.2W(4Ω) x 3CH @ THD=10%
No external LC low-pass filter required
20dB fixed voltage gain
Contains shutdown function
POP noise free during shutdown and power ON/OFF period
User adjustable power-on delay timing
Built-in short circuit protection
Built-in overheat protection
Low distortion (0.3%)
High efficiency (>85%, 8Ω load), low heat dissipation
SSOP 24 pins, 173 mil body width miniature packages
APPLICATIONS
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Small multimedia speakers
Laptop
LCD monitor
Portable DVD player
Portable Media player
Other audio applications
PT2002 V1.0
-1-
May, 2008
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
3CH, 2.2W, Class-D Audio Power Amplifier
PT2002
APPICATION CIRCUIT
OUTPUT WITH FERRITE BEAD FILTER
TP1
Vcc
TP2
GND
L3
FB
C9
1uF
L4
L5
FB
C10
1uF
L6
L7
FB
C11
1uF
L8
FB
C18
1n
C19
1n
FB
SP1
1
2
OUT1
C16
1n
C17
1n
FB
SP2
1
2
OUT2
C14
1n
C15
1n
SP3
1
2
OUT3
SW1
SHUTDOWN
L1
FB
IC1
PT2002
OUT3P
VDD3
GND3
OUT3N
OUT2N
GND2
VDD2
OUT2P
OUT1P
VDD1
GND1
OUT1N
24
23
22
21
20
19
18
17
16
15
14
13
C13
10uF
L2
FB
C12
10uF
P3
CH3
C1
C2
0.22uF
0.22uF
R1
1K
1
R2
1K
2
3
4
IN3P
IN3N
NC
NC
IN2N
IN2P
MCLR
VDD
GND
SD
IN1P
IN1N
C3
P2
CH2
C4
0.22uF
0.22uF
R3
1K
C5
0.22uF
C8
1uF
R4
1K
5
6
7
8
9
10
11
R6
1K
12
P1
CH1
C6
C7
0.22uF
0.22uF
R5
1K
Notes:
1. Ferrite Bead specification: Z=120Ω@100MHz, Current>3A
2. R1, R2, R3, R4, R5, R6 is an optional for reduce gain only; in general application these resistors are
not required.
PT2002 V1.0
-3-
May, 2008