UNISONIC TECHNOLOGIES CO., LTD PA3431 CMOS IC 2W STEREO AUDIO AMPLIFIER DESCRIPTION As a stereo audio speaker which is operating on a single 5V supply, the UTC PA3431 is capable of delivering 2W of output power per channel into 4Ω loads in Bridge-Tied Load (BTL) mode with less than 1% THD+N. Way of two terminals (GAIN0 and GAIN1) can configured and control the amplifier gain. It also provided BTL gain settings of 6 dB, 10 dB, 15.6 dB, and 21.6 dB (inverting). Other features: the SHDN mode is supported to disable UTC PA3431 for the low current consumption applications; the current consumption can be reduced to typically 150µA. FEATURES *Pb-free plating product number: PA3431L * 2W Output power into 4Ω load from 5V supply each channel * Gain control internally * Differential input fully * Depop circuitry * Shutdown protection thermally ORDERING INFORMATION Ordering Number Normal Lead Free Plating PA3431-N20-R PA3431L-N20-R PA3431-N20-T PA3431L-N20-T www.unisonic.com.tw Copyright © 2008 Unisonic Technologies Co., Ltd Package Packing HTSSOP-20 HTSSOP-20 Tape Reel Tube 1 of 11 QW-R502-185.A PA3431 CMOS IC PIN CONFIGURATION GND 1 20 GND GAIN0 2 19 SHUTDOWN GAIN1 3 18 ROUT+ LOUT+ 4 17 RIN- LIN- 5 16 VDD PVDD 6 15 PVDD RIN+ 7 14 ROUT- LOUT- 8 13 GND LIN+ 9 12 NC BYPASS 10 11 GND PIN DESCRIPTION PIN NO. 1,11 13,20 2 3 4 5 6,15 7 8 9 10 12 14 16 17 18 19 PIN NAME GND GAIN0 GAIN1 LOUT+ LINPVDD RIN+ LOUTLIN+ BYPASS NC ROUTVDD RINROUT+ SHUTDOWN I/O I I O I I I O I O I O I DESCRIPTION Ground Bit 0 of gain control Bit 1 of gain control Positive output for left channel Negative differential input for left channel Supply voltage Positive differential input for right channel Negative output for left channel Positive differential input for left channel Tap to voltage divider for internal mid supply bias generator Nothing connection Negative output for right channel Supply voltage Negative differential input for right channel Positive output for right channel In shutdown mode when held low UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 11 QW-R502-185.A PA3431 CMOS IC ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Power Dissipation (TA≤25℃) SYMBOL RATINGS UNIT VCC 6 V PD 2.7 W ℃ Junction Temperature TJ +150 ℃ Operating Temperature TOPR -40 ~ +85 ℃ Storage Temperature Range TSTG -65 ~ +150 Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ELECTRICAL CHARACTERISTICS (Ta=25℃, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS DC ELECTRICAL CHARACTERISTICS Supply Voltage VDD High-Level Input Voltage VIH SHUTDOWN, GAIN0, GAIN1 Low-Level Input Voltage VIL SHUTDOWN, GAIN0, GAIN1 DC Differential Output Voltage VO(DIFF) VDD= 5V,Gain = 2 Supply Current in Mute Mode IDD VDD= 5V, Stereo BTL Supply Current, Shutdown Mode IDD(SD) VDD= 5V AC ELECTRICAL CHARACTERISTICS (VDD = 5.0V, RL = 4Ω) THD =1%, BTL, RL= 4Ω, G=-2V/V THD =1%, BTL, RL= 8Ω, G=-2V/V Output Power POUT THD =10%, BTL, RL= 4Ω, G=-2V/V THD = 10%, BTL,RL= 8Ω, G=-2V/V POUT= 1.6W, BTL,RL= 4Ω, G=-2V/V Total Harmonic Distortion Plus Noise THD+N POUT= 1W, BTL, RL= 8Ω, G=-2V/V Max Output Power Bandwidth BOM THD = 5% Power Supply Ripple Rejection PSRR F=1kHz,BTL,G=-2V/V, CBYP=1µF Channel-to-Channel f = 1kHz Output Separation Signal-to-Noise Ratio SNR POUT= 500mW, BTL, G=-2V/V Output Noise Voltage VN BTL, G=-2V/V, A Weighted filter MIN TYP 4.5 2 5 5.5 5 7.5 160 0.8 50 11 300 2 1.2 2.5 1.6 100 60 15 68 MAX UNIT V V V mV mA µA W m% kHz dB 80 dB 90 dB µV (rms) 45 Note: Output power is measured at the output terminals of the IC at 1kHz. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 11 QW-R502-185.A PA3431 CMOS IC TYPICAL APPLICATION CIRCUIT 1 2 LEFT LINE INPUT SIGNAL 3 SPEAKER L 4 CLIN- 5 C1 1µF VDD CRIN+ 7 C4 1µF 8 CLIN+ C2 1µF 6 9 CB 10 GND GND GAIN0 SHUTDOWN GAIN1 ROUT+ LOUT+ LIN- RINUTC PA3431 PVDD RIN+ LOUTLIN+ BYPASS VDD PVDD ROUTGND NC GND 20 19 TO SYSTEM CONTROL RIGHT LINE INPUT SIGNAL 18 CRIN- 17 16 VDD C3 1µF 15 R 14 SPEAKER 13 12 CS1 1µF CS2 10µF 11 C5 1µF Typical Application Circuit Using Single-Ended Inputs UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 11 QW-R502-185.A PA3431 CMOS IC TYPICAL APPLICATION CIRCUIT(Cont.) 1 LEFT NEGATIVE DIFFERENTIAL INPUT SIGNAL 2 3 SPEAKER LEFT 4 CLIN- RIGHT POSITIVE DIFFERENTIAL INPUT SIGNAL LEFT POSITIVE DIFFERENTIAL INPUT SIGNAL 5 C1 1µF VDD CRIN+ 7 C4 1µF 8 CLIN+ C2 1µF 6 9 CB 10 GND GND GAIN0 SHUTDOWN GAIN1 ROUT+ LOUT+ LIN- RINUTC PA3431 VDD PVDD PVDD RIN+ ROUT- LOUT- GND LIN+ BYPASS NC GND 20 19 TO SYSTEM CONTROL 18 CRIN- 17 16 VDD C3 1µF RIGHT NEGATIVE DIFFERENTIAL INPUT SIGNAL 15 14 SPEAKER RIGHT 13 12 CS1 1µF CS2 10µF 11 C5 1µF Typical Application Circuit Using Differential Inputs UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 11 QW-R502-185.A PA3431 CMOS IC APPLICATION INFORMATION Shutdown Mode Operating SHUTDOWN PIN INPUT LOW HIGH OTHERS THE AMPLIFIER’S OUTPUT MUTE(the current of this device will be reduced to 160µA ) BTL Don’t Care CI(Input Capacitor) The value of CI is important to consider as it directly affects the bass performance of the application circuit. When CI is required to allow the amplifier to bias the input signal to the proper dc level for optimum operation, it’s value can be calculate by this equation: CI=1/(2πRIFC) RI:Input Impedance FC:High-pass Filter’s Frequency The low leakage tantalum or ceramic capacitors are suggested to be used as the input coupling capacitors, because of the small leakage current of the input ca-pacitors will cause the dc offset voltage at the input to the amplifier that reduces the operation headroom, especially at the high gain applications. It is important to let the positive side connecting to the higher dc level of the application when using the polarized capacitors. Gain setting (VS GAIN0, GAIN1 and RI) Gain setting is determined by GAIN0 and GAIN1. The gains listed in the next table are realized by changing the taps on the input resistors inside the amplifier which will cause the internal input impedance(R I) to be dependent on the gain setting as we can see listed in the next table. AV(dB) 6 10 15.6 21.6 GAIN0 0 0 1 1 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw GAIN1 0 1 0 1 RI(kΩ) 90 70 45 30 6 of 11 QW-R502-185.A PA3431 TYPICAL CHARACTERISTICS 10 5 Total Harmonic Distortion Plus Noise vs. Frequency 2 1 0.5 VDD=5V RL=3Ω PoUT=1.75W 0.2 0.1 POUT=0.5W POUT=1W 0.05 0.02 0.01 20 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) POUT=1.5W 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) Total Harmonic Distortion Plus Noise (%) Total Harmonic Distortion Plus Noise (%) Total Harmonic Distortion Plus Noise (%) 0.02 0.01 20 VDD=5V RL=3Ω AV=6dB 1 0.5 AV=10dB AV=6dB Total Harmonic Distortion Plus Noise vs. Frequency 2 AV=15.6dB 0.2 0.1 0.05 10 5 AV=21.6dB Total Harmonic Distortion Plus Noise (%) CMOS IC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 11 QW-R502-185.A Total Harmonic Distortion Plus Noise (%) Total Harmonic Distortion Plus Noise (%) Total Harmonic Distortion Plus Noise (%) Total Harmonic Distortion Plus Noise (%) Total Harmonic Distortion Plus Noise (%) Total Harmonic Distortion Plus Noise (%) PA3431 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw CMOS IC TYPICAL CHARACTERISTICS(Cont.) QW-R502-185.A 8 of 11 PA3431 2 VDD=5V RL=8Ω AV=6dB 1 0.5 0.05 0.02 0.01 20 POUT=1W POUT=0.5W 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) 10 5 Total Harmonic Distortion Plus Noise vs. Frequency 2 1 0.5 0.2 0.1 VDD=5V RL=8Ω POUT=1W AV=21.6dB AV=15.6dB AV=6dB 0.05 0.02 0.01 20 AV=10dB 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) Total Harmonic Distortion Plus Noise (%) Total Harmonic Distortion Plus Noise (%) 0.2 0.1 POUT=0.25W Total Harmonic Distortion Plus Noise (%) 10 5 Total Harmonic Distortion Plus Noise vs. Frequency Total Harmonic Distortion Plus Noise (%) Total Harmonic Distortion Plus Noise (%) TYPICAL CHARACTERISTICS(Cont.) Total Harmonic Distortion Plus Noise (%) CMOS IC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 11 QW-R502-185.A PA3431 Supply Ripple Rejection Ratio (dB) Supply Ripple Rejection Ratio (dB) TYPICAL CHARACTERISTICS(Cont.) Output Noise vs. Frequency Output Power vs. Load Resistance 2.5 Output Noise (V) Output Power (W) 500u 400 V =5V 300u DD RL=4Ω 200u A =6dB V A-Weighted filter 100u 70u 60u 50u 40u 30u 10u 20 VDD=5V THD+N=1% Each Channel 2 1.5 1 0.5 20u 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) 0 0 10 20 30 Load Resistance (Ω) 40 Power Dissipation vs. Output Power 1.8 RL=3Ω 1.6 Power Dissipation CMOS IC 1.4 1.2 RL=4Ω 1 VDD=5V Each Channel 0.8 0.6 0.4 0.2 0 0 RL=8Ω 0.5 1 1.5 Output Power (W) 2 2.5 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 of 11 QW-R502-185.A PA3431 CMOS IC UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 11 of 11 QW-R502-185.A