5W M
ONO
C
LASS
D P
LUS
TM
A
UDIO
A
MPLIFIER
GENERAL DESCRIPTION
The CM8685 is a single channel monolithic Class D Plus
and feed forward compensation techniques to achieve
better THD+N. The CM8685 integrated four power
MOSFETs to drive bridge tight load output. They are
guaranteed no shot through, adaptively control break
before make. The CM8685 can deliver peak output power
of up to 5 watts at 4Ω load from a single 5V power supply
in the high fidelity range (20 Hz to 20kHz). The CM8685
incorporated a green mode function to ensure high
efficiency at light load and full load. The CM8685 has the
optimal high efficiency of up to 90% and no heat sink
required. The efficient Class D Plus
temperature of 40
℃.
Low supply current of 3mA makes the device ideal for
battery-powered applications.
CM8685 is packaged in a 8-pin PSOP and PDIP package
saves the system space.
TM
TM
CM8685
FEATURES
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Wide input range of 2.0V to 5.0V
8 pin PSOP & PDIP package
Integrated power MOSFETs
Reduce system cost with no heat sink
Close Loop and Feed Forward compensation
Efficiency of up to 90%
Dramatically improves efficiency versus Class-AB
Excellent bass frequency without big bypass DC blocking
capacitor
Ultra low shut down current (1uA)
Ultra low operation current without load (3mA)
Internal Thermal Protection
Audio Amplifier IC that using Champion’s unique close loop
enables the CM8685
to operate at full power into 4Ω loads at an ambient
24 Hours Technical Support---WebSIM
Champion provides customers an online circuit simulation tool
called WebSIM. You could simply logon our website at
www.champion-micro.com for details.
APPLICATIONS
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Desktop & Laptop Computers
PDAs
Speakers (Multimedia speakers, USB speakers,..)
Multi-media Monitors (CRT monitors, LCD monitors,..)
Telephony Accessories (Feature phones, Web phones,
& cell phones,..)
MP3 Players
DVD Players
TVs (HDTV, LCD TV, Plasma TV,…)
Portable Radio Cassettes
PIN CONFIGURATION
PSOP-8 (PS08)/PDIP (P08)
Top View
1
2
3
4
VCC
VL1
AG ND
SD
VDD
VL2
PG ND
M USIC-IN
8
7
6
5
2002/04/22
Rev. 6
Champion Microelectronic Corporation
Page 1
5W M
ONO
C
LASS
D P
LUS
TM
A
UDIO
A
MPLIFIER
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are those values beyond which the device could be permanently damaged.
Supply Voltage
Input Voltage
Power Dissipation (Note 1)
ESD Susceptibility (Note 2)
-0.3 to 5.5V
-0.3V to V
CC
+0.3V
Internally Limited
2KV
Junction Temperature (Note 3)
Storage Temperature
Lead Temperature
(soldering 10 sec)
260℃
150
℃
-65℃≦T
A
≦150℃
CM8685
RECOMMENDED OPERATING CONDITIONS
MIN
Operating Free-air Temperature, T
A
Supply Voltage, VCC, VDD
High-level Input Voltage, V
IH
Low-level Input Voltage, V
IL
SD
SD
-20
3
2
0.8
4.5
TYP
MAX
70
5.5
UNIT
℃
V
V
V
ELECTRICAL CHARACTERISTICS
(Unless otherwise stated, these specifications apply T
A
=25°C;
Vcc=+5V and VDD=+5V)
maximum ratings are stress ratings only and functional device operation is not implied.
CM8685
Min.
Typ.
1
3
510
600
Max.
5
10
690
50
VCC=VDD=3.3V to 5.5V
IDD=0.5A, VDD=5V
5
55
<0.6
200
220
Symbol
Parameter
Test Conditions
REFERENCE SECTION
Unit
ISD
IDD
f
V
OS
PSRR
THD+N
Rds
(ON)
D
Supply Current, Shutdown Mode
Supply Current
Switching Frequency
Output Offset Voltage Between VL1
and VL2 with 8 ohm Load
Power Supply Rejection Ratio
Drain to Source on-State Resistance
Duty Cycle
VSD=5V
Without load
μA
mA
KHz
mV
dB
%
mΩ
%
Total Harmonic Distortion plus Noise Po=1W, 4 ohm load, f=1kHz ,
Note 1: For operating at case temperatures above 25℃, the device must be derated based on a 150℃ maximum junction
temperature and a thermal resistance of
θ
JA
=80℃/W (junction to ambient).
Note 2: Human body model, 100pF discharged through a 1.5KΩ resistor.
Note 3: The operating junction temperature maximum is 150℃.
2002/04/22
Rev. 6
Champion Microelectronic Corporation
Page 3
微控制器 MCU
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