TMPA2155DM

tai'mec GENERAL DESCRIPTION Preliminary www.taimec.com.tw / www.class-d.com.tw 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【RoHS】 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. http://www.taimec.com.tw/English/EVM.htm http://www.class-d.com.tw/English/EVM.htm for PCB layout. REFERENCE CIRCUIT Copyright ©2005, Tai-1 Microelectronics Corp. 1 tai'mec Preliminary www.taimec.com.tw / www.class-d.com.tw 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 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 ©2005, Tai-1 Microelectronics Corp. 2 tai'mec Supply voltage, VDD High-level input voltage, VIH Low-level input voltage, VIL Operating free-air temperature, TA Preliminary www.taimec.com.tw / www.class-d.com.tw 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 T A = 7 0。 C POWER RATING 0.511W T A = 8 5。 C POWER RATING 0.415W ELECTRICAL CHARACTERISTICS TA=25。 (unless otherwise noted) C 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=8Ω 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=8Ω V(SDNB)=5V IN+, IN- MIN TYP 25 -75 -55 MAX UNIT mV -55 -50 40 1 dB dB µA µA mA µA mΩ 2 0.2 790 200 17 250 21 200 12 15 3 0.5 300 25 kHz V/V kΩ 18 kΩ *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 ©2005, Tai-1 Microelectronics Corp. 3 tai'mec PARAMETER PO Output power / Ch Preliminary www.taimec.com.tw / www.class-d.com.tw TMPA2155DM Rev.1.0 December 24, 2007 OPERATING CHARACTERISTICS TA=25。 RL=8Ω speaker (unless otherwise noted) C, TEST CONDITIONS RL=8Ω RL=4Ω RL=3Ω VDD=AVDD=5V, PO=0.85W, RL=8Ω, f=1kHz THD+N Total harmonic distortion plus noise VDD=AVDD=5V, PO=1.3W, RL=4Ω, f=1kHz VDD=AVDD=5V, PO=1.5W, RL=3Ω, f=1kHz SNR Crosstalk Signal-to-noise ratio Crosstalk between outputs VDD=AVDD=5V, PO=1W, RL=8Ω VDD=AVDD=5V, PO=1W RL=8Ω 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 V O+ V OPIN 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 1µF 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. Copyright ©2005, Tai-1 Microelectronics Corp. 4 tai'mec Preliminary www.taimec.com.tw / www.class-d.com.tw TMPA2155DM Rev.1.0 December 24, 2007 APPLICATION INFORMATION Copyright ©2005, Tai-1 Microelectronics Corp. 5 tai'mec Preliminary www.taimec.com.tw / www.class-d.com.tw TMPA2155DM Rev.1.0 December 24, 2007 Copyright ©2005, Tai-1 Microelectronics Corp. 6 tai'mec Preliminary www.taimec.com.tw / www.class-d.com.tw 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. Copyright ©2005, Tai-1 Microelectronics Corp. 7 tai'mec DETAILED DESCRIPTION Efficiency Preliminary www.taimec.com.tw / www.class-d.com.tw 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. Copyright ©2005, Tai-1 Microelectronics Corp. 8 tai'mec Preliminary www.taimec.com.tw / www.class-d.com.tw 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）. 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 frequency（＜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 placement of the surrounding components. Copyright ©2005, Tai-1 Microelectronics Corp. 9 tai'mec reference. Preliminary www.taimec.com.tw / www.class-d.com.tw 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) 33μH Vo+ 0.47µ F 33μH Vo0.1µ F 0.1µ F Typical LC Output Filter (2) Copyright ©2005, Tai-1 Microelectronics Corp. 10 tai'mec Preliminary www.taimec.com.tw / www.class-d.com.tw 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 Copyright ©2005, Tai-1 Microelectronics Corp. 11 tai'mec Preliminary www.taimec.com.tw / www.class-d.com.tw 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 Copyright ©2005, Tai-1 Microelectronics Corp. 12 tai'mec Preliminary www.taimec.com.tw / www.class-d.com.tw 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. Copyright ©2005,Tai-1 Microelectronics Corp. Copyright ©2005, Tai-1 Microelectronics Corp. 13