TMPA218DS Datasheet, PDF (1/13 Pages) List of Unclassifed Manufacturers – 3.5W/CH STEREO CLASS-D AUDIO POWER AMPLIFIER

tai'mec
Preliminary
www.taimec.com.tw / www.class-d.com.tw
TMPA218DS
Rev.1.0 December 24,
2007
3.5W/CH STEREO CLASS-D AUDIO POWER AMPLIFIER
GENERAL DESCRIPTION
FEATURES
The TMPA218DS is a stereo class-D audio power amplifier IC ♦ 2.5V to 6V Single Supply
with digital volume control. With BTL (Bridge-Tied-Load) ^{♦ Up to 3.5W / Ch at 5.5V, 2 ohms}
configuration, it delivers up to 3.5W/ch (7W in all) into a
♦ Up to 88% Power Efficiency
2 ohm load. Up and down volume control signals provide _{♦ Automatic output power control (APC)}
-60dB attenuation form maximum voltage gain. No external
heat-sink is required.


For multiple-input applications, independent gain control and
♦ Memory of voltage gain at shutdown
♦ 0dB to -60dB attenuation from max. voltage gain
♦ 2.2mA / Ch Quiescent Current at 5V
corner frequency can be implemented by summing the input _{♦ Less Than 0.2uA / Ch Shutdown Current}
sources through resistor ratio and input capacitor values.
♦ Pop-less Power-Up, Shutdown and Recovery
Automatic output power control makes the best use of
battery.

♦ Differential 250 KHz PWM Allows Bridge-Tied Load to
increase Output Power and Eliminates LC Output Filter
Analog input signal is converted into digital output which _{♦ Thermal Shutoff and Automatic Recovery}
drives directly to the speaker. High power efficiency is
achieved due to digital output at the load. The audio
information is embedded in PWM€Pulse Width Modulation.
♦ _{Compatible with earphone application}
♦ Output Pin Short-Circuit Protection (Short to Other
Outputs, Short to VCC, Short to Ground)
APPLICATIONS
♦ Differential Signal Processing Improves CMRR
Multimedia application includes Cellular Phones, PDAs,
DVD/CD players, TFT LCD TVs/Monitors, 2.1 channel audio
systems, USB audio. It is also ideal for other portable
devices like Wireless Radios.
Package
TSSOP20 Available, pb freeŒRoHS
For best performance, please refer to
http://www.taimec.com.tw/English/EVM.htm
http://www.class-d.com.tw/English/EVM.htm
for PCB layout.
REFERENCE CIRCUIT€Please refer to TMPA002.APP for application
RIN
RIN
COM
COM
LIN
LIN
SDNB
UPB
DOWNB
MEMO
Ri
Ri
200K
200K
VCC
200K
VCC
C on tro l
C ircui try
PWM
PWM
Power
Drive
ROUTP
ROUTN
Power
Drive
LOUTP
LOUTN
TO PS
VDD
GND
TMPA218DS
Copyright©2005, Tai-1 Microelectronics Corp.
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