5 W + 5 W Dual BTL Class-D Audio Amplifier
The product described here is a high-efficiency dual BTL class-D audio amplifier with single supply operations. The project was built using TDA7491LP13TR from ST. The low profile PCB design can fit in a small area, operating power supply 9-12V DC, Project supports single-ended or differential audio signal inputs. Jumpers are provided to set the various gains, standby, and mute functions.
Key Features
- 5W + 5W Continuous Output Power, 10% THD, (8 Ohms Speaker) at 9V DC
- Single Supply Operation 9V to 12V
- Four Selectable Fixed Gains Settings of nominally 20dB, 26dB, 30dB, 32dB Using Jumpers
- Differential Inputs Minimize Common-Mode Noise
- Jumper for Single-Ended Inputs
- No “Pop” Sound at Turn-On/Off
- Thermal Over Load Protection
- Standby and Mute Features Using Jumpers
- PCB Dimensions 63.25 x 32.39 mm
Mode Selection
There are three operating modes defined bellow:
- Standby mode: all circuits are turned off, very low current consumption
- Mute mode: inputs are connected to the ground and the positive and negative PWM outputs are at 50% duty cycle.
- Play mode: the amplifiers are active
Jumper Setting Standby, Mute and Play Mod (Low=GND, High=3.3V)
- Standby Mode: Jumper J2 =Low, Jumper J1 (Don’t Care Whether low or high)
- Mute Mode: Jumper J2=High, Jumper J1 Low
- Play Mode: Jumper J2 = High, Jumper J1 High
Audio Signal Input (Single-Ended or Differential) Differential audio signal can be feed directly to CN1 , PIN 1 to 4
- Pin 1 >> IA +Input A Channel, Pin 2>> AN -Input A Channel
- Pin 3 >> NB +Input B Channel, Pin 4>> BN -Input B Channel
- For Single Ended Input Solder Jumper J5 and J6 (Channel A Input Pin1 Signal and Pin 2 GND, Channel B Pin3 Signal and Pin 4 GND)
Gain Setting (PCB Solder Jumper J3 and J4)
The gain of the TDA7491LP is set by the two inputs, GAIN0 (pin 30) and GAIN1 (pin 31). Internally, the gain is set by changing the feedback resistors of the amplifier.
- J3>>Low, J4>>Low =20dB (High=3.3V, Low=GND)
- J3>>Low, J4>>High =26dB (High=3.3V, Low=GND)
- J3>>High, J4>>Low =30dB (High=3.3V, Low=GND)
- J3>>High, J4>>High =32dB (High=3.3V, Low=GND)
Share
The product described here is a high-efficiency dual BTL class-D audio amplifier with single supply operations. The project was built using TDA7491LP13TR from ST. The low profile PCB design can fit in a small area, operating power supply 9-12V DC, Project supports single-ended or differential audio signal inputs. Jumpers are provided to set the various gains, standby, and mute functions.
Key Features
- 5W + 5W Continuous Output Power, 10% THD, (8 Ohms Speaker) at 9V DC
- Single Supply Operation 9V to 12V
- Four Selectable Fixed Gains Settings of nominally 20dB, 26dB, 30dB, 32dB Using Jumpers
- Differential Inputs Minimize Common-Mode Noise
- Jumper for Single-Ended Inputs
- No “Pop” Sound at Turn-On/Off
- Thermal Over Load Protection
- Standby and Mute Features Using Jumpers
- PCB Dimensions 63.25 x 32.39 mm
Mode Selection
There are three operating modes defined bellow:
- Standby mode: all circuits are turned off, very low current consumption
- Mute mode: inputs are connected to the ground and the positive and negative PWM outputs are at 50% duty cycle.
- Play mode: the amplifiers are active
Jumper Setting Standby, Mute and Play Mod (Low=GND, High=3.3V)
- Standby Mode: Jumper J2 =Low, Jumper J1 (Don’t Care Whether low or high)
- Mute Mode: Jumper J2=High, Jumper J1 Low
- Play Mode: Jumper J2 = High, Jumper J1 High
Audio Signal Input (Single-Ended or Differential) Differential audio signal can be feed directly to CN1 , PIN 1 to 4
- Pin 1 >> IA +Input A Channel, Pin 2>> AN -Input A Channel
- Pin 3 >> NB +Input B Channel, Pin 4>> BN -Input B Channel
- For Single Ended Input Solder Jumper J5 and J6 (Channel A Input Pin1 Signal and Pin 2 GND, Channel B Pin3 Signal and Pin 4 GND)
Gain Setting (PCB Solder Jumper J3 and J4)
The gain of the TDA7491LP is set by the two inputs, GAIN0 (pin 30) and GAIN1 (pin 31). Internally, the gain is set by changing the feedback resistors of the amplifier.
- J3>>Low, J4>>Low =20dB (High=3.3V, Low=GND)
- J3>>Low, J4>>High =26dB (High=3.3V, Low=GND)
- J3>>High, J4>>Low =30dB (High=3.3V, Low=GND)
- J3>>High, J4>>High =32dB (High=3.3V, Low=GND)
Dotfry has partnered with reputed logistic partners for our logistic services, to ensure that all our products reach you in the best of conditions with no damages. We ensure you that we use packaging materials of the best quality, which is sourced from reliable vendors, and ensure thorough testing of package worthiness before using them for shipping and delivery of our products.
Related Products
