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| Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 0.73W/CH STEREO CLASS-D AUDIO POWER AMPLIFIER GENERAL DESCRIPTION The TMPA2156D2 is a STEREO class-D audio power amplifier IC. With SE(Single-Ended) configuration, it delivers up to 0.73W/CH power into a 3 ohms load or 0.6W/CH power into a 4 ohm load or 0.33W/CH power into an 8 ohm load. No external heat-sink is required. Up to 85% Power Efficiency Automatic output power control (APC) 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 Popless Power-Up, Shutdown and Recovery Single-Ended output Thermal Shutoff and Automatic Recovery Short-Circuit Protection 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 PWMPulse Width Modulation. TSSOP8, SOP8 Available FEATURES 2.5V to 6V Single Supply Up to 0.73W/CH at 5V, 3 ohms Package APPLICATIONS Multimedia application includes Cellular Phones, PDAs, 2.1 channel, USB audio. It is also ideal for other portable devices like Wireless Radios. For best performance, please refer to //www.taimec.com.tw/data/Tmpa2155EVM/TMPA2156D2EVM.pdf for PCB layout. REFERENCE CIRCUIT Copyright (c)2005, Tai-1 Microelectronics Corp. 1 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 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 R2 100 JP1 J1 VI2 PHONEJACK STEREO VI1 0.47uF 0.47uF R4 R5 22k 22k 1 2 3 4 VO1 GND IN1 IN2 1uF 10uF + 1uF L1 33uH L2 Vo2 8 VDD7 VDDA 6 SDNB 5 VDDA R3 SDNB 33uH 100 R6 100K S1 switch C6 1uF C5 1uF VDD VDD R7 3k R13 3k + C8 1000uF + C9 1000uF VO2 VO1 C1 C2 R8 3k R9 3k 2156D2 R1 100 C10 + 100uF VDD 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 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. Copyright (c)2005, Tai-1 Microelectronics Corp. 2 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 RECOMMENDED OPERATING CONDITONS MIN Supply voltage, VDD 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 PACKGE SOP8 DERATING FACTOR 6.39mW/ C C TA 25 POWER RATING 0.799W TA = 70 C POWER RATING 0.511W TA = 85 C POWER RATING 0.415W ELECTRICAL CHARACTERISTICS TA=25 (unless otherwise noted) C PARAMETER PSRR CMRR IIH IIL IQ IQ (SD) rDS(on) f(sw) *Av RSDN ZI Power supply rejection ratio Common mode rejection ratio High-level input current Low-level input current Quiescent current Shutdown current Static output resistance Switching frequency Voltage gain Resistance from shutdown to GND Input impedance TEST CONDITIONS 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 MIN TYP -75 -55 30 MAX -55 -50 UNIT dB dB A 1 2.2 0.2 600 200 17 250 21 200 12 15 18 300 25 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. Copyright (c)2005, Tai-1 Microelectronics Corp. 3 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 OPERATING CHARACTERISTICS TA=25 RL=8 speaker (unless otherwise noted) C, PARAMETER RL=8 PO Output power/CH RL=4 RL=3 VDD=VDDA=5V, PO=0.2W, RL=8, f=1kHz THD+N Total harmonic distortion plus noise VDD=VDDA=5V, PO=0.3W, RL=4, f=1kHz VDD=VDDA=5V, PO=0.4W, RL=3, f=1kHz SNR Crosstalk Signal-to-noise ratio Crosstalk between outputs VDD=VDDA=5V, PO=1W, RL=8 VDD=AVDD=5V, PO=1W RL=8 VDD=VDDA=5V. THD+N=10%,f=1kHz. TEST CONDITIONS MIN TYP MAX 0.33 0.6 0.73 0.55 0.55 0.64 85 -60 UNIT W % dB dB TERMINAL FUNCTIONS TERMINAL I/O NAME GND IN2 IN1 SDNB VDD VDDA VO1 VO2 PIN NO 2 4 3 5 7 6 1 8 I I I I I I O O Digital ground Channel 2 input Channel 1 input Shutdown (active low logic) Digital Power supply Analog Power supply Channel 1 output Channel 2 output DESCRIPTION TYPICAL CHARACTERISTICS Note 1. Input coupling 1F capacitors are used for all measurements. 2. LC filter is used for THD+N measurement and power efficiency measurement. 3. Characteristic frequency of the LC filter is set 41KHz unless otherwise specified. Copyright (c)2005, Tai-1 Microelectronics Corp. 4 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 APPLICATION INFORMATION Copyright (c)2005, Tai-1 Microelectronics Corp. 5 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 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. Copyright (c)2005, Tai-1 Microelectronics Corp. 6 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 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 The setup time for the internal circuitry to be stable to drive the speaker is quite fast (<100ms). But for Single-ended outputs the set up time for the output circuit to charge up the output coupling capacitor (=1000uF) to half power voltage is quite long. As shown in the following diagram, the RC constant caused by the voltage divider of equivalent resistance of 1.5k ohms(3kohms//3kohms) and the capacitance of 1000uF of the output coupling capacitor is 1.5 seconds. So to save pop noise the shutdown pin(SDNB) has to be LOW during power up. In addition the shutdown pin has to stay LOW for about 5 seconds to wait for the output coupling capacitor to be charged to half supply voltage. Class-D amplifier + 1000uF + 3k 3k PVCC Copyright (c)2005, Tai-1 Microelectronics Corp. 7 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 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. 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. 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. The suggested LC values for different speaker impendence are showed in following figures for reference. Typical LC Output Filter, Speaker Impedance=4 Typical LC Output Filter, Speaker Impedance=6 & 8 Copyright (c)2005, Tai-1 Microelectronics Corp. 8 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 Typical Ferrite Chip Bead Filter Chip bead example KML2012Q102N 1kohms@100MHz, DCR=0.2ohms, I=1A EARPHONE USE Class-D output can be used to drive earphone. However to avoid high power to overdrive earphone and to prevent human ear to accidentally be hurt, a resistor has to be put in series with the earphone speaker. Typically a resistor of 330 ohms is adequate for this purpose. Copyright (c)2005, Tai-1 Microelectronics Corp. 9 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 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. 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. 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. Copyright (c)2005, Tai-1 Microelectronics Corp. 10 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 Physical Dimensions ( IN MILLIMETERS) 8 5 1 4 0.05TYP. 0.016TYP. 0.120 SYMBOLS A A1 D E H MIN. 0.053 0.004 0.189 0.150 0.228 0.063 H E MAX. 0.069 0.010 0.196 0.157 0.244 SOP8 Copyright (c)2005, Tai-1 Microelectronics Corp. 11 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 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 Copyright (c)2005, Tai-1 Microelectronics Corp. 12 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 Rev.1.0 September 7, 2005 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. Copyright (c)2005,Tai-1 Microelectronics Corp. Copyright (c)2005, Tai-1 Microelectronics Corp. 13 PDF created with pdfFactory trial version www.pdffactory.com |
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