TMPA2055DM

Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 2005 2.7-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER GENERAL DESCRIPTION The TMPA2055DM is a mono class-D filter–free audio power amplifier IC. 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. Two patents are pending. With common mode input structure, TMPA2055DM 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（ Pulse Width Modulation） . ♦ Less Than 0.2uA Shutdown Current ♦ Popless Power-Up, Shutdown and Recovery ♦ Differential 230 KHz PWM Allows Bridge-Tied Load to Doubles Output Power and Eliminates LC Output Filter ♦ Common Capacitors ♦ BTL Output Requires No Output Capacitors ♦ Thermal Shutoff and Automatic Recovery ♦ Short-Circuit Protection Mode Structure Requires No Input ♦ Up to 85% Power Efficiency ♦ 2.2mA Quiescent Current at 5V FEATURES ♦ 4.5V to 5.5V Single Supply ♦ Up to 2.7W at 5V, 3 ohms APPLICATIONS M ultimedia application includes Cellular Phones, PDAs, ♦ Differential Signal Processing Improves CMRR ♦ Package： TSSOP8, SOP8, MSOP8 Available 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. For best performance, please refer to http://www.taimec.com.tw/data/Tmpa2055EVM/tmpa2055 dmEVM.pdf for PCB layout. REFERENCE CIRCUIT C opyright ©2004, Tai-1 Microelectronics Corp. 1 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 2005 （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. ABSOLUTE MAXIMUM RATINGS O ver operating free-air temperature range unless otherwise noted(1) Supply voltage, VDD Input voltage, V I C ontinuous total power dissipation Operating free-air temperature, TA Operating junction temperature, TJ Storage temperature, Tstg Lead temperature 1,6mm(1/16 inch)from case for 10 seconds 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 150 260 。 C 。 C 。 C (1) Stresses beyond those listed under”absolute maximum ratings” m ay 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. RECOMMENDED OPERATING CONDITONS M IN Supply voltage, VDD High-level input voltage, V IH Low-level input voltage, VIL Input resistor, Ri C ommon Mode Input Voltage Range Operating free-air temperature, TA 4.5 NOM MAX 5.5 VDD 0.8 UNIT V V V kΩ VDD 85 V 。 C SDN SDN Gain ≤ 20 V/V (26dB) VDD=VDDA=4.5V〜 5.5V, CMRR ≤ -55dB 2 0 0 0 -20 PACKAGE DISSIPATION RATINGS PACKGE 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 C opyright ©2004, Tai-1 Microelectronics Corp. 2 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 2005 ELECTRICAL CHARACTERISTICS TA=25。 (unless otherwise noted) C PARAMETER │VOS│ PSRR CMRR │ IIH│ │ IIL│ IQ IQ (SD) rDS(on) f(sw) Av Output offset voltage (measured differentially) Power supply rejection ratio C ommon 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 R esistance from shutdown to GND TEST CONDITIONS VI=0V,AV=2, VDD=VDDA=4.5V to 5.5V VDD=VDDA=4.5V to 5.5V VDD=VDDA=4.5V to 5.5V, VIC=1Vpp, RL=8Ω VDD=VDDA=5.5V, VI=5.8V ( SDN ) VDD=VDDA=5.5V, VI=-0.3V ( SDN ) VDD=VDDA=5V, no load V( SDN )=0.8V, VDD=VDDA=4.5V to 5.5V VDD=VDDA=4.5V VDD=VDDA=4.5V to 5.5V VDD=VDDA=4.5V to 5.5V MIN TYP 25 -75 -55 MAX UNIT mV -55 -50 20 1 dB dB μA μA mA μA mΩ 2 0.2 790 200 135kΩ RI+15kΩ 230 150kΩ RI+15kΩ 380 3 0.5 260 165kΩ RI+15kΩ kHz V V kΩ OPERATING CHARACTERISTICS TA=25。 Av=2, RL=8Ω speaker (unless otherwise noted) C, PARAMETER PO PO PO Output power Output power Output power RL=8Ω THD+N=10%,f=1kHz, RL=4Ω THD+N=10%,f=1kHz, RL=3Ω TEST CONDITIONS THD+N=10%,f=1kHz, VDD=VDDA=5V VDD=VDDA=5V VDD=VDDA=5V MIN TYP MAX 1.5 2.3 2.7 0.55 0.55 0.64 84 13.5 15 16.5 UNIT W W W VDD=VDDA=5V, PO=0.85W, RL=8Ω, f=1kHz THD+N Total harmonic distortion plus noise VDD=VDDA=5V, PO=1.3W, RL=4Ω, f=1kHz VDD=VDDA=5V, PO=1.5W, RL=3Ω, f=1kHz SNR ZI Signal-to-noise ratio Input impedance VDD=VDDA=5V, PO=1W, RL=8Ω % dB kΩ TOP VIEW C opyright ©2004, Tai-1 Microelectronics Corp. 3 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 2005 TERMINAL FUNCTIONS TERMINAL I/O NAME ININ+ VDD VO+ GND VOSDN VDDA PIN NO 4 3 6 5 7 8 1 2 I I I O I O I I Negative differential input Positive differential input Digital Power supply Positive BTL output Digital ground Negative BTL output Shutdown terminal (active low logic) Analog Power supply DESCRIPTION TYPICAL CHARACTERISTICS N ote 1. Input coupling 1µ F 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. C opyright ©2004, Tai-1 Microelectronics Corp. 4 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 2005 APPLICATION INFORMATION C opyright ©2004, Tai-1 Microelectronics Corp. 5 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 2005 C opyright ©2004, Tai-1 Microelectronics Corp. 6 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 2005 Note：Please refer to document 010 APP for more application examples. C opyright ©2004, Tai-1 Microelectronics Corp. 7 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 2005 Figure 5 ~7 show typical ferrite bead and LC output filters. 15μ H Vo+ 0.22μ F 15μH Vo0.22μ F 1μ F Figure 5. Typical LC Output Filter, Cutoff Frequency of 41 kHz, Speaker Impedance=4Ω 33μ H Vo+ 0.47μ F 33μH Vo0.1μ F 0.1μ F Figure 6. Typical LC Output Filter, Cutoff Frequency of 41 kHz, Speaker Impedance=8Ω Ferrite Chip Bead Vo+ Ferrite Chip Bead Vo100pF 100pF Figure 7. Typical Ferrite Chip Bead Filter （Chip bead example：遠越科技 KML2012Q102N 1kohms@100MHz, DCR=0.2ohms, I=1A） l Input Resistors and Gain The BTL gain of the amplifier is determined by Gain= 150kohms where Ri is the source impedance of the input signal. Ri+15kohms C opyright ©2004, Tai-1 Microelectronics Corp. 8 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 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 SOP8 0.063 H E MAX. 0.069 0.010 0.196 0.157 0.244 C opyright ©2004, Tai-1 Microelectronics Corp. 9 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 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 C opyright ©2004, Tai-1 Microelectronics Corp. 10 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw TMPA2055DM May 5, 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 ©2004,Tai-1 Microelectronics Corp. C opyright ©2004, Tai-1 Microelectronics Corp. 11 PDF created with pdfFactory trial version www.pdffactory.com