The specific analysis of the circuit will not be detailed, only the more prominent advantages compared with the traditional constant voltage power amplifier will be introduced. This kind of circuit structure is the constant current power amplifier that people often say. Its feedback circuit is current sampling, voltage summation and negative feedback. This power amplifier circuit is somewhat different from the previous two structures. When use TDA7294 as BTL power amplifier, the load must not be less than 8 ohms.įigure 2 BTL Circuit Diagram IV. When the power supply is ☓5V, a continuous output power of 180W can be obtained on a 16 ohm load. When the power supply voltage is ☒5V, a continuous output power of 150W can be obtained on an 8 ohm load. It is suitable for places that require high power such as dance halls.

The output power can reach more than 150W. It uses two TDA7294 bridges to form a BTL power amplifier circuit. If the speaker impedance is less than 8 ohms, the power supply voltage should be reduced accordingly.įigure 1 OCL Circuit Diagram III. It is very suitable for playback in an environment below 30 square meters. When the power supply voltage is ☓5V, 70W continuous output power can be obtained on an 8 ohm load. There are few external components and simple circuit.

The OCL circuit diagram is shown in Figure 1. This circuit is a dual-channel 70W power amplifier composed of two TDA7294. VI. Active Subwoofer Amplifier Adds Standby Function This article will introduce several power amplifier circuit designs based on TDA7294. It has the characteristics of high voltage resistance, low noise, low distortion, and very affinity for replaying sound and has a silent standby function, short-circuit current and overheat protection functions to make its performance more perfect. The design of this chip focuses on tone, and has the advantages of bipolar signal processing circuit and power MOS.

It sweeps away the raw, cold, and hard tones of the previous linear integrated power amplifiers and thick film integration, and is widely used in the HI-FI field: such as home theater, active speakers, etc. TDA7294 is a very innovative DMOS high-power integrated amplifier circuit launched by the famous European SGS-THOMSON STMicroelectronics to mainland China in the 1990s.

Tda7293 parallel circuit layout