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Tai-1 Microelectronics
www.taimec.com.tw / www.class-d.com.tw
Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
2.7W/CH STEREO CLASS-D AUDIO POWER AMPLIFIER GENERAL DESCRIPTION
The TMPA2155DS is a stereo class-D audio power amplifier IC. With BTL(Bridge-Tied-Load) configuration, it delivers up to 2.7W/ch(5.4W in all) into a 3 ohm load or 2.3W/ch(4.6W in all) into a 4 ohm load or 1.5W/ch(3W in all) into an 8 ohm load. No external heat-sink is required. 2.2mA / Ch 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 / Ch Shutdown Current Pop-less Power-Up, Shutdown and Recovery Differential 250 KHz PWM Allows Bridge-Tied Load to Doubles Output Power and Eliminates LC Output Filter Thermal Shutoff and Automatic Recovery 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 . Outputs, Short to VCC, Short to Ground) Differential Signal Processing Improves CMRR Compatible with earphone application Output Pin Short-Circuit Protection (Short to Other
FEATURES
2.5V to 6V Single Supply Up to 2.7W / Ch at 5V, 3 ohms Up to 85% Power Efficiency Automatic output power control (APC)
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.
Package
TSSOP20, QFN24 Available 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 CIRCUITPlease refer to TMPA002.APP for application
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
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
VD D C16 1uF (6.3V ) JP1 J1 C1 1uF (6.3V) PH ONEJACKSTE REO C2 1uF (6.3V) C3 1uF (6.3V) C4 1uF (6.3V ) R3 330 R4 330 R12 0 R6 22k R7 22k R8 22k 22k C17 1uF (6.3V) C13 470uF(6.3V) + C11 1uF (6.3V ) C14 470p(6.3V) UTP GN D 1 LO 20 D UTN 2 VD LO 19 VD D 3 NC 18 P 4 LIN SDNB 17 LIN AV 16 N DD 5 N ND 6 RIN AG 15 P CAP 7 RIN 14 VD D 8 NC 13 D UTN 9 VD RO 12 UTP GN D 10RO 11 2155DS(FD) C5 1uF (6.3V)(optional) R5 C6 1uF (6.3V) SDN 100 R10 10K L2 33uH L1 33uH
VO 1+ C9 1uF (6.3V ) VO 1C10 1uF (6.3V ) LS2
C15 R9 470p(6.3V)
swich S1 t L3 VO 2C8 1uF (6.3V)
33uH C7 1uF (6.3V)(optional) L4 33uH
VO 2+ C12 1uF (6.3V )
LS1
J3 VR
ABSOLUTE MAXIMUM RATINGS
Over operating free-air temperature range unless otherwise noted(1) Supply voltage, VDD, AVDD 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 V V V
See package dissipation ratings -20 to 85 C -20 to 150 -40 to 150 C C
(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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Tai-1 Microelectronics
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
RECOMMENDED OPERATING CONDITONS
MIN Supply voltage, VDD, AVDD High-level input voltage, VIH Low-level input voltage, VIL Operating free-air temperature, TA SDNB SDNB 2.5 2 0 -20 NOM MAX 6 VDD 0.8 85 UNIT V V V C
PACKAGE DISSIPATION RATINGS
PACKAGE TSSOP20 DERATING FACTOR 8.73 mW/ C TA 25 C POWER RATING 1.09W TA = 70 C POWER RATING 698mW TA = 85 C POWER RATING 567mW
ELECTRICAL CHARACTERISTICS
TA=25 (unless otherwise noted) C PARAMETER
VOS PSRR CMRR IIH IIL IQ IQ (SD) rDS(on) f(sw) *Av RSDN ZI Output offset voltage (measured differentially) Power supply rejection ratio Common mode rejection ratio High-level input current Low-level input current Quiescent current / Ch Shutdown current / Ch Static output resistance Switching frequency BTL Gain Resistance from shutdown to GND Input impedance
TEST CONDITIONS
VI=0V,AV=2, VDD=AVDD=2.5V to 5.5V VDD=AVDD=2.5V to 5.5V VDD=AVDD=2.5V to 5.5V, VIC=1Vpp, RL=8 VDD=AVDD=5.5V, VI=5.8V (SDNB) VDD=AVDD=5.5V, VI=-0.3V (SDNB) VDD=AVDD=5V, no load V( SDN )=0.8V, VDD=AVDD=2.5V to 5.5V VDD=AVDD=5.5V VDD=AVDD=2.5V to 5.5V VDD=AVDD=2.5V to 5.5V, RL=8 V(SDNB)=5V RINN,RINP,LINN,LINP
MIN
TYP
25 -75 -55 30
MAX
UNIT
mV
-55 -50
dB dB A
1 2.2 0.2 790 230 12 280 16 200 15 330 20 3 0.5
A mA A m kHz V V k 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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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
OPERATING CHARACTERISTICS
TA=25 RL=8 speaker (unless otherwise noted) C, PARAMETER
RL=8 PO Output power / Ch (Limited by thermal condition) 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.
TEST CONDITIONS
MIN TYP MAX
1.5 2.3 2.7 0.55 0.55 0.64 95 -68
UNIT
W W W
%
dB dB
TERMINAL FUNCTIONS
TERMINAL I/O NAME AGND AVDD CAP GND LINN LINP LOUTN LOUTP NC RINN RINP ROUTN ROUTP SDNB VDD PIN NO 15 16 14 11,20 5 4 19 1 3,8 6 7 12 10 17 2,9,13,18 I I I O O I I O O I Analog ground Analog Power supply Capacitance for power up delay Digital ground Negative input of left channel Positive input of left channel Negative output of left channel Positive output of left channel No Connection Negative input of right channel Positive input of right channel Negative output of right channel Positive output of right channel Shutdown terminal (active low logic) Digital Power supply 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
TMPA2155DS
Rev.1.0 June 27, 2006
APPLICATION INFORMATION
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
Copyright(c)2005, Tai-1 Microelectronics Corp.
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
l
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 external serial resistance at the input pin. Ri + 15kohms
NotePlease refer to document 010 APP for more application examples.
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
DETAILED DESCRIPTION Efficiency
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
A soft start capacitor can be added to the CAP pin. This capacitor introduces delay for the internal circuit to be stable before driving the load. The pop or click noise when power up/down or switching in between shutdown mode can be thus eliminated. The delay time is proportional to the value of the capacitance. It is about 500ms for a capacitor of 1uF at 5v.
CAP
Cap provides a way of soft startup delay. A 5uA current source and a half_Vcc detector are integrated in the chip. The charged capacitor is externally hooked up. For C=1uF the half_Vcc delay is T = CV / I = 1uF x 2.5V/ 5uA = 0.5 seconds
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
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.
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 higherFCC and CE only test radiated emissions greater than 30 MHz. When selecting a ferrite bead, choose one with high impedance at high frequencies, but low impedance at low frequencies. Use an LC output filter if there are low frequency1 MHzEMI sensitive circuits and/or there are long wires from the amplifier to the speaker. EMI is also affected by PCB layout and the placement of the surrounding components.
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
The suggested LC values for different speaker impendence are showed in following figures for reference.
Typical LC Output Filter (1)
33H Vo+ 0.47 F 33H Vo0.1 F 0.1 F
Typical LC Output Filter (2)
Over temperature protection
A temperature sensor is built in the device to detect the temperature inside the device. When a high temperature around 145oC and above is detected the switching output signals are disabled to protect the device from over temperature. Automatic recovery circuit enables the device to come back to normal operation when the internal temperature of the device is below around 120oC.
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
Over current protection
A current detection circuit is built in the device to detect the switching current of the output stages of the device. It disables the device when the current is beyond about 3.5amps. It protects the device when there is an accident short between outputs or between output and power/gnd pins. It also protects the device when an abnormal low impedance is tied to the output. High current beyond the specification may potentially causes electron migration and permanently damage the device. Shutdown or power down is necessary to resolve the protection situation. There is no automatic recovery from over current protection.
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
Physical Dimensions
(IN MILLIMETERS)
7.72 TYP 4.16 TYP
(1.78 TYP)
0.42 TYP 0.65 TYP
LAND PATTERN
TSSOP20
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
QFN24
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Preliminary
TMPA2155DS
Rev.1.0 June 27, 2006
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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