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TEA2025 Datasheet(PDF) 5 Page - STMicroelectronics |
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TEA2025 Datasheet(HTML) 5 Page - STMicroelectronics |
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5 / 9 page  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 The voltage gain is determined by on-chip resis- tors R1 and R2 together with the external RfC1 series connected between pin 6 (11) and ground. The frequency response is given approximated by: VOUT VIN = R1 Rf + R2 + 1 JWC1 With Rf=0, C1=100 uF, the gain results 46 dB with pole at f=32 Hz. THE purpose of Rf is to reduce the gain. It is rec- ommended to not reduce it under 36 dB. BRIDGE MODE The bridge configuration is realized very easily thanks to an internal voltage divider which pro- vides (at pin 1) the CH 1 output signal after reduc- tion. 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: VOUT VIN = R1 Rf +R2 + 1 JWC1 (1+ R3 R4 R1 R2 +R4+ 1 JWC1 ) and with the suggested values (C1 = C2 = 100 µF, Rf= 0) means: Gv = 52 dB with first pole at f = 32 Hz Output Capacitors. The low cut off frequency due to output capacitor depending on the load is given by: FL = 1 2 ΠCOUT • RL with COUT 470 µF and RL = 4 ohm it means FL = 80 Hz. Pop Noise Most amplifiers similar to TEA 2025B need exter- nal resistors between DC outputs and ground in order to optimize the pop on/off performance and crossover distortion. The TEA 2025B solution allows to save compo- nents because of such resistors (800 ohm)are in- cluded into the chip. Figure 7 Figure 8 Figure 9 TEA2025B - TEA2025D 5/9 |
Similar Part No. - TEA2025 |
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Similar Description - TEA2025 |
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