The TDA7850 is a 4×50 w MOSFET quad bridge power amplifier IC, most common in car audio amplifiers or 4 channel surround audio systems. If you are planning to build a 4 channel surround amplifier board this IC is the best choice for you.
Each channel of output pins is coming from the IC. There is no common grounding for the speakers. So you don’t connect the speaker pins to the ground. This is because the IC is designed as Bridge mode to Boost the output RMS of the amplifier.
You will see the OUT1+ and OUT1- terminal for speaker connections, connecting each speaker directly to the proper connection pins. The IC has the speaker out and each channel will deliver the maximum output watts of 50W at 4 ohms speaker.
TDA7850 4x50w Amplifier IC Pinout
Features of TDA7850 IC
- High output power handling capacity, each channel delivers up to 50 watts at 4 ohms speakers.
- Inbuilt MOSFET output power stage.
- 2 ohms speaker driving capability.
- Low noise and distortion.
- Standby and Mute function.
- The circuit needs only a low number of external components to work.
- Additional protection features like reverse polarity, Load dump voltage and Very inductive load.
- Operating voltage is 18v DC single power supply.
Electrical Specification of TDA7850
| Parameter | Value | Unit |
|---|---|---|
| Operating supply voltage | 18 | V |
| DC supply Voltage | 28 | V |
| Peak supply voltage | 50 | V |
| Output power | Vs=14.4V, THD=10%, 2 ohms | 50W (min), 55W (max) |
TDA7850 IC Amplifier Circuit Diagram
The pin numbers 11, 12, 15 and 14 are the audio input pins. The Pin number 13 and 1 is connected directly to the ground connection. The audio input is separated using a 0.1uf capacitor. You can use 104 based box type capacitors for high quality audio. The low frequency cut off for the input signal is 16Hz. The Tda7850 ha an inbuilt DC offset detector.
FAQ
The TDA7850 deliver 50watts at 4 ohms speaker on each channel. It is a bridge mode 4 channel audio amplifier IC.
