TMPA2156D2

Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 R ev.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 PWM（ Pulse Width Modulation） . TSSOP8, SOP8 Available ♦ FEATURES ♦ 2.5V to 6V Single Supply ♦ Up to 0.73W/CH at 5V, 3 ohms Package APPLICATIONS M ultimedia 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 C opyright ©2005, Tai-1 Microelectronics Corp. 1 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 R ev.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 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 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” 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. C opyright ©2005, Tai-1 Microelectronics Corp. 2 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 R ev.1.0 September 7, 2005 RECOMMENDED OPERATING CONDITONS M IN Supply voltage, VDD High-level input voltage, V IH 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 C ommon mode rejection ratio High-level input current Low-level input current Quiescent current Shutdown current Static output resistance Switching frequency Voltage gain R esistance 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=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 MIN TYP -75 -55 30 MAX -55 -50 UNIT dB dB μA 1 2.2 0.2 600 200 17 250 21 200 12 15 18 300 25 3 0.5 μA mA μA mΩ kHz V/V kΩ 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. C opyright ©2005, Tai-1 Microelectronics Corp. 3 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 R ev.1.0 September 7, 2005 OPERATING CHARACTERISTICS TA=25。 RL=8Ω speaker (unless otherwise noted) C, PARAMETER RL=8Ω PO Output power/CH RL=4Ω RL=3Ω VDD=VDDA=5V, PO=0.2W, RL=8Ω, f=1kHz THD+N Total harmonic distortion plus noise VDD=VDDA=5V, PO=0.3W, RL=4Ω, f=1kHz VDD=VDDA=5V, PO=0.4W, RL=3Ω, f=1kHz SNR Crosstalk Signal-to-noise ratio Crosstalk between outputs VDD=VDDA=5V, PO=1W, RL=8Ω VDD=AVDD=5V, PO=1W RL=8Ω 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 N ote 1. Input coupling 1µ F 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. C opyright ©2005, Tai-1 Microelectronics Corp. 4 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 R ev.1.0 September 7, 2005 APPLICATION INFORMATION C opyright ©2005, Tai-1 Microelectronics Corp. 5 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 R ev.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 Note：Please refer to document 010 APP for more application examples. C opyright ©2005, Tai-1 Microelectronics Corp. 6 PDF created with pdfFactory trial version www.pdffactory.com Tai-1 Microelectronics www.taimec.com.tw Preliminary TMPA2156D2 R ev.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 (