Tai-1 Microelectronics
www.taimec.com.tw
TMPA205DS
December 2004
2.45-W/Ch STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER
GENERAL DESCRIPTION
The TMPA205DS is a stereo class-D filter鈥揻ree audio power
amplifier IC. It delivers up to 2.45W/Ch power into a 4 ohm
load or 1.5W/Ch power into an 8 ohm load. Two patents are
pending.
With common mode input structure, TMPA205DS requires no
input or output coupling capacitors. It also features high
Common Mode Rejection Ratio and Power Supply Rejection
Ratio.
For multiple-input applications, independent gain control and
corner frequency can be implemented by summing the input
sources through resistor ratio and input capacitor values.
Analog input signal is converted into digital output which
drives directly to the speaker. High power efficiency is
achieved due to digital output at the load. The audio
information is embedded in PWM錛圥ulse Width Modulation錛?
鈾?/div>
Differential
Signal
Processing
Improves
CMRR
&
鈾?/div>
Less Than 0.3uA Shutdown Current
鈾?/div>
Popless Power-Up, Shutdown and Recovery
鈾?/div>
Differential 250 KHz PWM Allows Bridge-Tied Load to
Doubles Output Power and Eliminates LC Output Filter
鈾?/div>
Common Mode Structure Requires No Input Capacitors
鈾?/div>
BTL Output Requires No Output Capacitors
鈾?/div>
Thermal Shutoff and Automatic Recovery
鈾?/div>
Short-Circuit Protection
鈾?/div>
Up to 92% Power Efficiency
鈾?/div>
3.5mA Quiescent Current
FEATURES
鈾?/div>
2.5V to 5.5V Single Supply
鈾?/div>
Up to 5.3W/Ch Max. Power or 2.45W/Ch rms.
Eliminates Power Regulation & Bypass Capacitor
APPLICATIONS
Multimedia application includes Cellular Phones, PDAs,
DVD/CD players, TFT LCD TVs/Monitors, 2.1 channel/5.1
channel audio systems, USB audio. It is also ideal for other
portable devices like Wireless Radios.
鈾?/div>
Package錛歍SSOP, PDIP, SOP Available
REFERENCE CIRCUIT錛圥lease refer to TMPA002.APP for application錛?/div>
V
DD
To PS
Cs
Ri1
Vi1
-
Differential
Input
Ri1
Vi1
+
IN1+
IN1-
Vo1
+
-
PWM
+
Power
Drive
Vo1
-
VDD
Vo1-
GND
SDN1
VDDA
GNDA
IN2+
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Vo1+
GND
IN1-
IN1+
GNDA
VDDA
SDN2
GND
Vo2-
VDD
SDN1
SDN2
Ri2
Vi2
-
Differential
Input
Ri2
Vi2
+
IN2+
Control
Circuitry
IN2-
Vo2
+
-
PWM
+
Power
Drive
Vo2
-
GND
TMPA205DS
IN2-
GND
Vo2+
錛圥lease
email david@taimec.com.tw for complete datasheet.錛?/div>
Copyright漏2003, Tai-1 Microelectronics Corp.
1
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