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GENERAL DESCRIPTION
Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
2.7-W MONO CLASS-D AUDIO POWER AMPLIFIER FEATURES
2.5V to 6V Single Supply The TMPA2155DM is a mono class-D audio power amplifier IC. With BTL(Bridge-Tied-Load) configuration, it delivers up to 2.7W power into a 3 ohms load or 2.3W power into a 4 ohm load or 1.5W power into an 8 ohm load. No external heat-sink is required. 2.2mA Quiescent Current at 5V 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. Automatic voltage gain control makes the best use of battery. Less Than 0.2uA Shutdown Current Pop-less Power-Up, Shutdown and Recovery Differential 250 KHz PWM Allows BTL to Doubles Output Power and Eliminates LC Output Filter 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 Pulse Width Modulation . Compatible with earphone application Thermal Shutoff and Automatic Recovery Short-Circuit Protection Differential Signal Processing Improves CMRR Up to 2.7W at 5V, 3 ohms Up to 85% Power Efficiency Automatic output power control (APC)
APPLICATIONS Package
Multimedia application includes Cellular Phones, PDAs, TSSOP8, SOP8 Available, pb free DVD/CD players, TFT LCD TVs/Monitors, 2.1 channel/5.1 channel audio systems, USB audio. It is also ideal for other For best performance, please refer to portable devices like Wireless Radios.
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RoHS
for PCB layout.
REFERENCE CIRCUIT
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Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
TOP VIEW
Please email david@taimec.com.tw for complete datasheet.
Tai-1 Microelectronics reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers are responsible for their products and applications using Tai-1 Microelectronics components.
Note that the external components or PCB layout should be designed not to generate abnormal voltages to the chip to prevent from latch up which may cause damage to the device.
Typical Application
C3 C7 C4 R1 0 R2 100 JP1 J1 IN1+ IN1R4 R5 Ri Ri C9 470pF(6.3V) 1 2 3 4 VO+ GND IN+ IN-
1uF (6.3V)VDDA VDD 470uF(6.3V) + 1uF (6.3V) L1 33uH L2 R3 SDNB 33uH 100 R6 10K S1 switch VOVO+ C5 1uF (6.3V) C6 1uF (6.3V) Vo- 8 VDD7 VDDA 6 SDNB 5
C1 C2
1uF (6.3V) 1uF (6.3V)
2155DM C8 1uF (6.3V)
PHONEJACK STEREO
ABSOLUTE MAXIMUM RATINGS
Over operating free-air temperature range unless otherwise noted(1) Supply voltage, VDD Input voltage, VI Continuous total power dissipation Operating free-air temperature, TA Operating junction temperature, TJ Storage temperature, Tstg In normal mode In shutdown mode -0.3V to 6V -0.3V to 7V -0.3V to VDD+0.3V -20 to 85 -20 to 150 -40 to 150 V V V C C C
See package dissipation ratings
(1) Stresses beyond those listed under"absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions "is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
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Supply voltage, VDD High-level input voltage, VIH Low-level input voltage, VIL Operating free-air temperature, TA
Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
RECOMMENDED OPERATING CONDITONS
MIN 2.5 SDNB SDNB 2 0 -20 NOM MAX 6 VDD 0.8 85 UNIT V V V C
PACKAGE DISSIPATION RATINGS
PACKAGE SOP8 DERATING FACTOR 6.39mW/ C TA 25 C POWER RATING 0.799W TA = 70 C POWER RATING 0.511W TA = 85 C POWER RATING 0.415W
ELECTRICAL CHARACTERISTICS
TA=25 C (unless otherwise noted) PARAMETER
VOS PSRR CMRR IIH IIL IQ IQ (SD) rDS(on) f(sw) *Av RSDNB ZI Output offset voltage (measured differentially) Power supply rejection ratio Common mode rejection ratio High-level input current Low-level input current Quiescent current Shutdown current Static drain-source on-state resistance Switching frequency BTL Gain Resistance from shutdown to GND Input impedance
TEST CONDITIONS
VI=0V,AV=2, VDD=VDDA=2.5V to 5.5V VDD=VDDA=2.5V to 5.5V VDD=VDDA=2.5V to 5.5V, VIC=1Vpp, RL=8 VDD=VDDA=5.5V, VI=5.8V (SDNB) VDD=VDDA=5.5V, VI=-0.3V (SDNB) VDD=VDDA=5V, no load V(SDNB)=0.8V, VDD=VDDA=2.5V to 5.5V VDD=VDDA=5.5V VDD=VDDA=2.5V to 5.5V VDD=VDDA=2.5V to 5.5V, RL=8 V(SDNB)=5V IN+, IN-
MIN
TYP
25 -75 -55
MAX
UNIT
mV
-55 -50 40 1
dB dB A A mA A m
2 0.2 790 200 17 250 21 200 12 15
3 0.5
300 25
kHz V/V k
18
k
*The gain of the amplifier is determined by, for VDD=VDDA =2.5V to 5.5V
Gain = 320kohms Ri + 15kohms
where Ri is the external serial resistance at the input pin.
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PARAMETER
PO Output power / Ch
Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
OPERATING CHARACTERISTICS
TA=25 C, RL=8 speaker (unless otherwise noted) TEST CONDITIONS
RL=8 RL=4 RL=3 VDD=AVDD=5V, PO=0.85W, RL=8, f=1kHz THD+N Total harmonic distortion plus noise VDD=AVDD=5V, PO=1.3W, RL=4, f=1kHz VDD=AVDD=5V, PO=1.5W, RL=3, f=1kHz SNR Crosstalk Signal-to-noise ratio Crosstalk between outputs VDD=AVDD=5V, PO=1W, RL=8 VDD=AVDD=5V, PO=1W RL=8 VDD=AVDD=5V. THD+N=10%,f=1kHz.
MIN
TYP MAX
1.5 2.3 2.7 0.55 0.55 0.64 85 -60
UNIT
W W W
%
dB dB
TERMINAL FUNCTIONS
TERMINAL I/O NAME GND ININ+ SDNB VDD VDDA VO+ VOPIN NO 2 4 3 5 7 6 1 8 I I I I I I O O Digital ground Negative differential input Positive differential input Shutdown terminal (active low logic) Digital Power supply Analog Power supply Positive BTL output Negative BTL output DESCRIPTION
TYPICAL CHARACTERISTICS
Note 1. Input coupling 1F capacitors are used for all measurements. 2. Differential inputs are applied and BTL outputs are measured. 3. Balanced LC filter is used for THD+N measurement and power efficiency measurement. 4. Characteristic frequency of the LC filter is set 41KHz unless otherwise specified.
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Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
APPLICATION INFORMATION
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Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
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Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
Input Resistors and Gain
The gain of the amplifier is determined by, for VDD=VDDA =2.5V to 5.5V Gain = 320kohms where Ri is the source impedance of the input signal. Ri + 15kohms Note Please refer to document 010 APP for more application examples.
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DETAILED DESCRIPTION Efficiency
Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
The output transistors of a class D amplifier act as switches. The power loss is mainly due to the turn on resistance of the output transistors when driving current to the load. As the turn on resistance is so small that the power loss is small and the power efficiency is high. With 8 ohm load the power efficiency can be better than 85%.
Shutdown
The shutdown mode reduces power consumption. A LOW at shutdown pin forces the device in shutdown mode and a HIGH forces the device in normal operating mode. Shutdown mode is useful for power saving when not in use. This function is useful when other devices like earphone amplifier on the same PCB are used but class D amplifier is not necessary. Internal circuit for shutdown is shown below.
Pop-less
The shutdown pin is designed to give pop-less start up. The RC delay provided by external R(=100k ohms) and external C(=1uF) introduces enough delay for the internal circuitry to be stable before the signal is fed to the speaker. This delay is good for shutdown ON-OFF and power UP-DOWN operations.
Voltage gain
The voltage gain is defined in the table on page 3. For lower voltage gain one can add external input resistors to input pins. If external resistors are used they should be well matched. Well matched input resistors are also required even for single ended input configuration for low noise.
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Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
Automatic output Power Control (APC)
The voltage gain is self adjusted in the chip over voltage range. This means that, regardless supply voltage change, the output power keeps about the same for a given input level from VDD=5.5v to 2.5v. It allows the best use of the battery.
Differential input VS single ended input
Differential input offers better noise immunity over single ended input. A differential input amplifier suppresses common noise and amplifies the difference voltage at the inputs. For single ended applications just tie the negative input end of the balanced input structure to ground. If external input resistors are used, the negative input has to be grounded with a series resistor of the same value as the positive input to reduce common noise.
Output filter
Ferrite bead filter can be used for EMI purpose. The ferrite filter reduces EMI around 1 MHz and higher FCC and CE only test radiated emissions greater than 30 MHz frequencies. Use an LC output filter if there are low frequency placement of the surrounding components. 1 MHz EMI sensitive circuits and/or there are long wires from the amplifier to the speaker. EMI is also affected by PCB layout and the . When selecting a ferrite bead, choose one with high impedance at high frequencies, but low impedance at low
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reference.
Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
The suggested LC values for different speaker impendence are showed in following figures for
Typical LC Output Filter (1)
33 H Vo+ 0.47 F 33 H Vo0.1 F 0.1 F
Typical LC Output Filter (2)
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Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
Physical Dimensions
( IN MILLIMETERS)
8
5
1 0.016TYP.
4 0.05TYP.
0.120
SYMBOLS A A1 D E H
MIN. 0.053 0.004 0.189 0.150 0.228
SOP8
0.063
H
E
MAX. 0.069 0.010 0.196 0.157 0.244
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Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
Physical Dimensions
( IN MILLIMETERS)
SYMBOLS A A1 A2 D E E1
MIN. 0.05 0.96 2.90
NDM. 1.01 3.00 6.40 BSC
MAX. 1.20 0.15 1.06 3.10
4.30
4.40
4.50
TSSOP8
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Preliminary
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TMPA2155DM
Rev.1.0 December 24, 2007
IMPORTANT NOTICE
Tai-1 Microelectronics Corp. reserves the right to make changes to its products and services and to discontinue any product or service without notice. Customers should obtain the latest relevant information for reference. Testing and quality control techniques are used to screen the parameters. Testing of all parameters of each product is not necessarily performed. Tai-1 Microelectronics Corp. assumes no liability for applications assistance or customer product design. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. Reproduction of information in data sheets or related documentation is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Tai-1 Microelectronics Corp. is not responsible or liable for such altered documentation. Resale of Tai-1 Microelectronics Corp. products or services with statements different from the parameters stated by Tai-1 Microelectronics Corp. for that product or service voids all express and any implied warranties. Tai-1 Microelectronics Corp. is not responsible or liable for any such statements.
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