TDA7250 driver 100W amplifier ----- TDA7250 Power Amplifier

TDA7250 driven 100W power amplifier, TDA7250 power amplifier Keywords: TDA7250 amplifier, TDA7250 circuit, 100W amplifier, 100W power amplifier In the design of the amplifier circuit, the most difficult problem than the transistor pair and zero drift differential circuit, a power amplifier to careless also rushed ...... Well now you can try TDA7250. TDA7250 company SGS-THOMSON to produced a power amplifier driver IC, it is characterized as follows: The peripheral circuit is simple and easy to make; Support wide voltage range: 2V-90V (± 10V- ± 45V); Having no temperature compensation of the zero drift control circuit; A power transistor overcurrent protection; Mute / standby function; Low power consumption; Low harmonic distortion: PO = 40W, fo = 0.004% by harmonic distortion 1KHz Output power 60W / 8Ω, 100W / 4Ω. The following is the application circuit diagram: Overcurrent protection circuit may be seen from the above principle is the TDA7250 detection resistor R11, R12, R13, R14 of the voltage. When transistor overcurrent, according to U = I · R, the resistance derived voltage increases, the voltage reaches a certain, TDA7250 zero voltage will be the base of the transistor, the transistor to achieve the overcurrent protection action. The resistors R14, R15, R16, R17 are negative feedback loops, and the gain of the entire circuit is determined by the ratio of R14, R15, and R16, R17, formula GV = 1 + R14 / R16 or GV = 1 + R15 / R17. The above circuits have a use of enthusiasts: the difference in comparison of different power tubes. I just happen to have MJ11032 / 11033, MJ11015 / 11016, 2SC3055 / 2955,2SC4278 / A1633,2SB522 / D522, TIP142 / 147, etc. on the tube, then individually connected to the debugger. Feida speaker for the 12-inch box. The results are as follows: Be The first hearing is MJ11032 / 11033, on this pipe treble transparent, bright, round and full tenor, lips and teeth sound could be heard clearly, bass is powerful, flexible, bass after listening to it, think of the other tube bass are satisfactory, especially 2SC3055 / 2955 and TIP142 / 147 is uninteresting; MJ11015 / 11016 in the high, middle and bass are worse than MJ11032 / 11033, especially in the harmonic intensity and treble bass; 2SB522 / D522 relatively pure tone, low volume worse than MJ11015 / 11016, but good in the treble overtones compare MJ11015 / 11016; 2SC4278 / A1633 overall with 2SB522 / D522 almost as if the treble / D522 even better than 2SB522; and 2SC3055 / 2955 and TIP142 / 147 I felt very bad, I do not know whether to buy is authentic.

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