UNISONIC TECHNOLOGIES CO.,LTD. TEA2025 LINEAR INTEGRATED CIRCUIT STEREO AUDIO AMPLIFIER DESCRIPTION The UTC TEA2025 is a monolithic integrated audio amplifier in a 16-pin plastic dual in line package. It is designed for portable cassette players and radios. FEATURES *Working Voltage down to 3V *Few External components *High Channel isolation *Voltage gain up to 45dB(Adjustable with external resistor) *Soft clipping *Internal Thermal protection DIP-16 *Pb-free plating product number: TEA2025L ORDERING INFORMATION Order Number Normal Lead Free Plating TEA2025-D16-T TEA2025L-D16-T Package Packing DIP-16 Tube PIN CONFIGURATION BRIDGE 1 16 +Vs OUT.2 2 15 OUT.1 BOOT.2 3 14 BOOT.1 GND 4 13 GND GND 5 12 GND FEEDBACK 6 11 FEEDBACK IN.2 (+) 7 10 IN.1 (+) SVR 8 9 www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co.,LTD. GND (sub) 1 QW-R107-033.B TEA2025 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM 9 10 11 12 13 14 15 50Ω 10kΩ THERMAL PROTECTION START CIRCUIT 5kΩ 8 16 DECOUPLING 50Ω 7 1 10kΩ 50Ω 6 5 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 3 2 2 QW-R107-033.B TEA2025 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Ta = 25℃) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VSS 15 V Peak Output Current IO (peak) 1.5 A Junction Temperature TJ 150 °C Operating Temperature TOPR -20 ~ +85 ℃ Storage Temperature TSTG -40 ~ +150 ℃ Note 1. 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. 2. The device is guaranteed to meet performance specification within 0℃~70℃ operating temperature range and assured by design from –20℃~85℃. ELECTRICAL CHARACTERISTICS (Ta=25℃, 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 RL=4Ω RL=8Ω RL=4Ω Output Power RL=8Ω Total Harmonic Distortion RL=4Ω RL=8Ω RL=4Ω Stereo Bridge Supply Voltage Rejection Input Noise Voltage Cross-Talk TEST CONDITIONS MIN 3 Stereo Bridge 43 49 ΔGV RIN f=1kHz,THD=10%, VCC=9V Stereo per channel POUT THD SVR RG=0 Vn RG=10kΩ C.T. 1.7 0.7 VCC=6V 40 AV=200, Bandwidth:20Hz ~ 20kHz RG=10kΩ, f=1kHz,RL=4Ω, POUT=1W 40 4.5 45 51 40 MAX 12 50 47 53 +-1 UNIT V mA V dB 30 2.3 1.3 1 0.6 0.1 4.7 2.8 0.3 0.5 VCC=3V Bridge, VCC=9V VCC=6V VCC=9V, RL=4Ω, f=1kHz,POUT=250mW RG=0,AV=45Db,VRIPPLE=150mV FRIPPLE=100Hz TYP dB kΩ W 1.5 46 % dB 1.5 3 3 6 μV 55 dB THERMAL CHARACTERISTICS PARAMETER Thermal Resistance Junction to ambient Thermal Resistance Junction to case UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw SYMBOL θJA θJC RATINGS 60 15 UNIT ℃/W 3 QW-R107-033.B TEA2025 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 (0.22 uF)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 (100uF) avoids a reduction of the output signal also at low frequencies and low supply voltages. Voltage Gain Adjust STEREO MODE （Figure 1） The voltage gain is determined by on-chip resistors R1 and R2 together with the external RfC1 series connected between pin 6 (11) and ground. The frequency response is given approximated by: VOUT R1 = VIN Rf + R2 + 1 JWC1 With Rf=0, C1=100μF, the gain results 46 dB with pole at f=32 Hz. THE purpose of Rf is to reduce the gain. It is recommended to not reduce it under 36 dB. 6 (11) R2 2 (15) Rf R1 C1 Figure 1 BRIDGE MODE (Figure 2) The bridge configuration is realized very easily thanks to an internal voltage divider which provides (at pin 1) the CH 1 output signal after reduction. It is enough to connect pin 6 (inverting input of CH 2) with a capacitor to pin 1 and to connect to ground the pin 7. The total gain of the bridge is given by: and with the suggested values (C1 = C2 = 100 uF, Rf = 0) means: Gv = 52 dB with first pole at f = 32 Hz UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 QW-R107-033.B TEA2025 LINEAR INTEGRATED CIRCUIT IN OUT OUT R1 R1 R3 R2 R2 R4 Figure 2 Output Capacitors The low cut off frequency due to output capacitor depending on the load is given by: with COUT 470uF and RL = 4 ohm it means FL = 80Hz. Pop Noise (Figure 3) Most amplifiers similar to UTC TEA2025 need external resistors between DC outputs and ground in order to optimize the pop on/off performance and crossover distortion. OUT 800 Figure 3 The UTC TEA2025 solution allows to save components because of such resistors (800 ohm) are included into the chip. Stability A good layout is recommended in order to avoid oscillations. Generally 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 (poliester) 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 PO (and therefore Ptot) and Id are reduced. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 QW-R107-033.B TEA2025 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT Vcc Vcc 100 F 0.22 F 10 16 Vin 100 F 100 F 100 F 2 1 100 F RL 3 100 F 8 Vin 1 0.15 F 7 6 0.22 F 14 15 11 10 100 F 16 4,5,9,12,13 100 F 14 15 11 470 F 0.15 F 0.22 F Vin 2 100 F 3 6 100 F 8 OUT1 RL 100 F 7 2 0.15 F Fig. 4 Bridge Application 100 F 470 F 0.15 F OUT2 RL 4,5,9,12,13 Fig.5 Stereo Application SCHEMATIC DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 QW-R107-033.B TEA2025 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 QW-R107-033.B