Amplifier TDA7294 Test ----- TDA7294 Tester

Amplifier TDA7294 Test, TDA7294 Tester Keywords: amplifier TDA7294 test Amplifier TDA7294 Test First, chip description The TDA7294 is an integrated power discharge circuit that has a new DMOS high-power introduced to mainland China in the 1990s in the 1990s. It sweeps the neutralization of raw, cold, hard tone, and widely used in Hi-FL fields: Home theater, active speakers, etc. The chip is designed with a sound point, and there is an advantage of bipolar signal processing circuits and power MOS. Has special pressure resistance, low noise, low distortion, resettick, etc., and has mute standby function, short-circuit current, and overheating protection make it more perfect, parameters are as follows. Working voltage range: (VCC + VEE) = 80V; Output power: up to 100W; voltage range: | VCC | + | VEE | = 20V ~ 80V; quiescent current: 30mA; Output power: | VCC | = | VEE | = 35V 70W of RL = 8Ω; Total harmonic distortion (THD): 0.01% (typ); conversion rate (SR): 10V / μs; open loop gain: 80dB. The owner purchase is 13 no yuan. Second, pin information 1 foot is the standby terminal; 2 foot is inverted input; 3 foot is a positive phase input; 4 foot ground; 5, (11), (12) feet is empty; 6 feet is self-contained; 7 foot is + VS (signal processing section); 8 foot is -VS (signal processing section); pin is standby; (13) pin is + vs (end level); (14) pin is output (15) The foot is -VS (end level). Third, the circuit diagram 1. R1, R2 and R5 constitute a typical amplification of R5 / R1 approximately 32 times; 2. C1, C2, C8, C9 are power filter capacitance; 3. The feet and ⑩ feet can be switched separately to control the standby and mute, C6, C7 as filtering and draft. Fourth, test conditions 1, no-load, power supply and allowed bit with WD-5 steady sources + 12.1V, -12.1V, + 5.0V. Be 2, use SG1732SB5A DC stabilization stabilization power supply as input. 3, use a multimeter SYG DT9205G measurement. V. Test Summary Start testing misunderstanding is low in linearity, and the analysis is that the magnification is too large, but the maximum voltage is 3.86V is too small, and it is not suitable for certain high voltage output requirements. As a common sound chip, it is still good (excluding fever). See Figure 3 for the test curve.

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