UNISONIC TECHNOLOGIES CO., LTD TEA2025D LINEAR INTEGRATED CIRCUIT STEREO AUDIO AMPLIFIER DESCRIPTION The UTC TEA2025D is a monolithic integrated circuit that intended for use as dual or bridge power audio amplifier portable radio cassette players. FEATURES * Dual or bridge connection modes. * Few external components. * Supply voltage down to 3V. * High channel separation. * Very low switch on\off noise. * Max gain of 45dB with adjust external resistor. * Soft clipping. * Thermal protection. * 3V<VCC<15V * P=2*1W,VCC=6V,RL=4Ω * P=2*2.3W,VCC=9V,RL=4Ω * P=2*0.1W,VCC=3V,RL=4Ω ■ ORDERING INFORMATION Order Number TEA2025DG-S20-R Package SOP-20 Packing Tape Reel MARKING www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd 1 of 7 QW-R107-017.C TEA2025D ■ LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION BRIDGE 1 20 Vcc OUT2 2 19 OUT1 BOOT2 3 18 BOOT1 GND 4 17 GND GND 5 16 GND GND 6 15 GND GND 7 14 GND FEEDBACK 8 13 FEEDBACK IN 2(+) 9 12 IN 1(+) 10 11 GND(Sub) SVR ■ BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 7 QW-R107-017.C TEA2025D ■ LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Supply Voltage VSS 15 V Output Peak Current IO(PEAK) 1.5 A Junction Temperature TJ 150 C Storage Temperature TSTG 150 C 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. ■ THERMAL DATA PARAMETER SYMBOL Thermal Resistance Junction-case θJC Thermal Resistance Junction-ambient θJA Note: The θJA is measured with 4 cm2 copper area heatsink. ■ RATINGS 15 65 UNIT C/W C/W ELECTRICAL CHARACTERISTICS (Ta=25C, VCC=9V, Stereo unless otherwise specified) PARAMETER Supply Voltage Quiescent Current Quiescent Output Voltage SYMBOL VSS IQ VOUT Voltage Gain GV Voltage Gain Difference Input Impedance Output Power (d=10%) Distortion TEST CONDITIONS Stereo Bridge MIN 3 43 49 ∆GV(DIFF) RI RL=4 RL=32 RL=4 RL=8 RL=16 RL=32 RL=4 RL=8 RL=8 RL=16 RL=32 RL=4 RL=8 RL=8 Stereo Bridge VSS=3V 0.7 POUT 1.7 VSS=12V VSS=3V POUT Bridge VSS=6V VSS=9V d SVR Input Noise Voltage eN(IN) CT VSS=9V; RL=4 f=100Hz,VR=0.5V,Rg=0 Rg=0 Rg=104 f=1KHz, Rg=10K UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw VSS=6V VSS=9V Supply Voltage Rejection Cross-Talk Stereo 8 (per channel) 40 40 TYP 35 4.5 45 51 30 0.1 0.02 1 0.6 0.25 0.13 2.3 1.3 2.4 0.18 0.06 2.8 1.5 4.7 0.3 0.5 46 1.5 3 52 MAX 12 50 47 53 ±1 UNIT V mA V dB dB dB k W 1.5 3 6 % % dB mV mV dB 3 of 7 QW-R107-017.C TEA2025D ■ LINEAR INTEGRATED CIRCUIT APPLICATION INFORMATION Input Capacitor Input capacitor is PNP type allowing source to be referenced to ground. In this way no input coupling capacitor is required. However, a series capacitor(0.22μF) to the input side can be useful in case of noise due to variable resistor contact. Bootstrap The bootstrap connection allows to increase the output swing. The suggested value for the bootstrap capacitors (100μF) avoids a reduction of the output signal also at low frequencies and low supply voltage. Voltage Gain Adjust STEREO MODE The voltage gain is determined by on-chip resistors R1 and R2 together with the external RfC1 series connected between pin 8(13) and ground. The frequency response is given approximated by: VOUT VIN = R1 1 Rf +R2+ JWC1 With Rf=0,C1=100μF, the gain results 46dB with pole at f=32Hz The purpose of RfI is to reduce the gain. It is recommended to not reduce it under 36dB. BRIDGE MODE Figure 7 8(13) Rf C1 R2 2(19) 50 R1 10K The bridge configuration is realized very easily thanks to an internal voltage divider which provides (at pin 1)the CH1 output signal after reduction. It is enough to connect pin8(inverting input of CH 2 )with a capacitor to pin 1 and to connect to ground the pin 9. The total gain of the bridge is given by: VOUT VIN = R3 R1 R1 1 (1+ R4 1 ) Rf +R2+ JWC1 R2+R4+ JWC1 and with the suggested values (C1=C2=100μF,Rf=0)means: Gv=52dB Figure 8 IN OUT R1 10K R2 OUT R1 10K R2 R3 5K R4 50 With first pole at f=32Hz UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 7 QW-R107-017.C TEA2025D ■ LINEAR INTEGRATED CIRCUIT APPLICATION INFORMATION(Cont.) Output Capacitors. The low cut off frequency due to output capacitor depending on the load is given by: 1 FL = 2πCOUT *RL With COUT 470μF and RL=4 ohm it means FL=80Hz. Stability A good layout is recommended in order to avoid oscillations. In general, the designer must pay attention on the following points: -Short wires of components and short connections. -No ground loops. -Bypass of supply voltage with capacitors as nearest as possible to the supply I.C. pin. The low value (polyester) capacitors must have good temperature and frequency characteristics. -No sockets. The heatsink can have a smaller factor of safety compared with that of a conventional circuit. There is no device damage in the case of excessive junction temperature: all that happens is that POUT (and therefore PD) and Id are reduced. APPLICATION SUGGESTION The recommended values of the components are those shown on stereo application circuit of Fig.2 different values can be used, the following table can help the designer. Component Recommended Purpose C1,C2 0.22μF Input DC Decoupling in Case of Slider Contact Noise of Variable Resistor C3 100μF Ripple Rejection C4,C5 C6,C7 C8,C9 C10,C11 100μF 470μF 0.15μF 100μF Bootstrap Output DC Decoupling Frequency Stability Inverting Input DC Decoupling UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Larger Than Smaller Than Degradation of SVR, Increase of THD at Low Frequency and Low Voltage Increase of Low Frequency Cut-off Danger of Oscillations Increase of Low Frequency Cut-off 5 of 7 QW-R107-017.C TEA2025D ■ LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 7 QW-R107-017.C TEA2025D ■ LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS 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 7 of 7 QW-R107-017.C