This article introduces two power amplifier circuits TD1514A designed by Philips for digital audio as the two-channel power amplifier circuit of this Hi-Fi combination (as shown in the figure below, the other channel in the figure is omitted, the other channel is The figure shows the TDA1514A's output power is large: Pout = 50W (VP = ± 27.5V), high conversion speed: 15V / μs, excellent signal-to-noise ratio of 85dB, ripple rejection of 75dB, THD - 0.08%, TDA1514A operating voltage: ±9-±30V, TDA1514A circuit has standby and squelch state, with overheat protection, short circuit protection, power tube safe working area protection and electrostatic discharge protection. Low offset voltage, high ripple rejection, and very low thermal resistance.
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As we all know, many power amplifiers have a power of about 100W × 2, but in the home, the volume is usually only about 1/5 - 1/4, that is, only about 10-30W, and it is necessary to open the ears. Suffering from sin, the thorns can not stand and will make the music distorted, so the general tens of square meters of families have "golden power" about 30W audio equipment is most suitable.
Application circuit diagram 5 characteristics of the circuit: the use of constant current negative feedback and DC servo system (DC servo circuit main circuit is used to accurately correct the TDA1514A circuit after canceling the negative feedback of the ground blocking capacitor, the output DC potential drift). The current sample flowing through the speaker voice coil is fed back to the amplifier input by the linear element resistance RA (0.5 Ω 2W), so that the amplifier drives the load in a fixed current mode, and the speaker is oscillated by the current control to sound. The characteristic is that when the playback frequency is near the low frequency and the resonance peak, the constant current circuit enhances the strength of the bass and the resolving power of the high sound, so that the playback sound of the whole system sounds full, thick and clear, and has the charm of the tube amp. .
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