Circuit Power amplifier stereo IC TDA7854TH 2x 210W
The TDA8954 is a stereo or mono high-efficiency Class D audio power amplifier in a single IC featuring low power dissipation. It is designed to deliver up to 2 × 210W into a 4Ω load in a stereo Single-Ended (SE) application. It combines the benefits of Class D efficiency (≈93 % into a 4 Ω load) with audiophile sound quality comparable to that associated with Class AB amplification.The amplifier operates over a wide supply voltage range from ±12.5V to ±42.5V and features low quiescent current consumption.The TDA8954 is supplied with two diagnostic pins for monitoring the status of Thermal Fold Back (TFB), Over Current Protection (OCP) and other protection circuits.
Features
- High output power in typical applications:SE 2×210W, RL=4 Ω (VDD=41V; VSS=−41V)SE
- Symmetrical operating supply voltage range from ±12.5V to ±42.5V
- Stereo full differential inputs, can be used as stereo SE or mono BTL amplifierLow noise
- Smooth pop noise-free start-up and switch off2-pin diagnostics for protection circuits
- Fixed frequency internal or external clock
- High efficiency ≈93 %Zero dead time switchingLow quiescent currentAdvanced protection strategy: voltage protection and output current limiting
- Thermal FoldBack (TFB) with disable functionalityFixed gain of 30dB in SE and 36dB in BTL applications
- Fully short-circuit proof across loadBD modulation in BTL configurationClock protection
he TDA8954 is a two-channel audio power amplifier that uses Class D technology.For each channel, the audio input signal is converted into a digital Pulse Width Modulation (PWM) signal using an analog input stage and a PWM modulator. To drive the output power transistors, the digital PWM signal is fed to a control and handshake block and to high- and low-side driver circuits. This level-shifts the low-power digital PWM signal from a logic level to a high-power PWM signal switching between the main supply lines.A second-order low-pass filter converts the PWM signal to an analog audio signal that can be used to drive a loudspeaker.
Schematic TDa7854 power amplifier circuit
PCB
Part list
| Parts | Value | description | Amount |
| Capacitors | |||
| C1, C2 | 100p | Ceramic capacitor SMD 0805 | 2 |
| C3, C4 | 470µ/63V | Electrolytic capacitor | 2 |
| C5 | 22µF/160V | Electrolytic capacitor | 1 |
| C6, C7, C8, C9, C12 | 470n/35V | Polyester Capacitor | 5 |
| C10, C11 | 330p | Ceramic capacitor SMD 0805 | 2 |
| C13, C16 | 220n | Ceramic capacitor SMD 0805 | 2 |
| C14 | 47p | Ceramic capacitor SMD 0805 | 1 |
| C15, C21, C22 C31, C32 | 100n | Ceramic capacitor SMD 0805 | 9 |
| C17, C18, C19, C20, | 100n | Ceramic capacitor SMD 1206 | 9 |
| C23, C24, C33, C34 | 15n | Ceramic capacitor SMD 0805 | 4 |
| C25, C26, C27, C28 | 220p | Ceramic capacitor SMD 0805 | 4 |
| C29, C30 | 680n/100V | Polyester Capacitor | 2 |
| Semiconductors | |||
| D1 | 5V1 | Zener Diode 5v1 SMD | 1 |
| IC1 | TDA8954TH | NXP integrated circuit | 1 |
| Others | |||
| DC | Terminal block 3 pins | Power supply | 1 |
| IN | 2.54mm connector | audio input | 1 |
| OUR | Terminal block 2 pins | Right channel output | 1 |
| OUTRL | Terminal block 2 pins | Left channel output | 1 |
| L1, L2 | 10µH | Toroidal Coil 10A | 2 |
| Resistors | |||
| R1, R2, R3, R4 | 220 (221) | Resistor SMD 0805 | 4 |
| R5, R6, R7, R8 | 5.6K (562) | Resistor SMD 0805 | 4 |
| R9, R10, R13, R14 | 10R (100) | Resistor SMD 1206 | 4 |
| R11 | 30K (303) | Resistor SMD 0805 | 1 |
| R12 | 27K (273) | Resistor SMD 0805 | 1 |
| R15, R16 | 22 (Red, Red, Black, Gold) | Resistor 5W | 2 |
| Welding, Wires, PCB, Box, Power Supply | |||
Download the files in PDF and Gerber to make the printed circuit board
This is great Toni. By the way, do you have an audio amplifier that you recommend for subwoofer for cars? Stereo with 12V supply (car Battery) and can do 500w double voice coil subs.