Mono 2W – Switch-Mode (Class D) Audio Power Amplifier
This is a compact size, mono, switch-mode (Class-D) audio power amplifier intended for multimedia and general-purpose high-power applications. It has greater than 87% efficiency and is capable of delivering 2W maximum continuous power to a 4Ω load. The project is designed to be driven by the line-out or headphone jack of a CD/MP3 player or to be directly connected to any audio source. The project includes header connectors for speakers, power supply, and audio input for quick connection. The project also has 3x jumpers for frequency selection and shutdown action. The project is built using the MAX4295 chip.
Undervoltage Lockout
At low supply voltages, the MOSFETs in the H-bridge may have inadequate gate drive thus dissipating excessive power. The Undervoltage lockout circuit prevents the device from operating at supply voltages below +2.2Vdc.
Low-Power Shutdown Mode (Jumper J3 for Shutdown)
The MAX4295 has a shutdown mode that reduces power consumption and extends battery life. Driving SHDN low disables the H-bridge, turns off the circuit, and places the MAX4295 in a low-power shutdown mode. Connect SHDN to VCC using jumper 3 for normal operation.
Frequency Selection (Jumper J1 and J2 For Frequency Selection)
The MAX4295 has an internal logic-programmable oscillator controlled by FS1 and FS2 (see table below). The oscillator can be programmed to frequencies of 125kHz, 250kHz, 500kHz, and 1MHz. The working frequency should be chosen to best fit the user application. As a rule of thumb, choose fOSC to be 10x times the audio bandwidth. A lower switching frequency offers higher amplifier efficiency and lower THD but requires larger external filter components. A higher switching frequency reduces the size and cost of the filter components at the expense of THD and efficiency. In most applications, the optimal fOSC is 250kHz.
Connections and Other Details
- CN1: Pin 1 and Pin 2 = VCC, Pin and Pin 4 = GND (VCC Supply 2.7V to 5.5V DC)
- LS1: Pin 1 and Pin 2 = Speaker 1, Pin 3 and Pin 4 = Speaker 2
- CN2: Pin 2 Audio Signal Input, Pin 1 GND
- Jumpers J1 and J2: Frequency select pins FS1 and FS2. See Table for the shunt positions.
- Jumper J3: Shutdown selection, GND= Shutdown
- D1: Power LED
Features
- Operating Power Supply +2.7V to +5.5V Input Range (1.5A)
- 2W Channel Output Power at 5V
- 7W/Channel Output Power at 3V
- 87% Efficiency (RL = 4Ω, POUT = 2W)
- Programmable PWM Oscillator Frequency Selection (125kHz, 250kHz, 500kHz, 1MHz)
- Low 0.4% THD+N (RL = 4Ω, fIN = 1kHz, fOSC = 250kHz)
- Low-Power Shutdown Mode
- 1A Current Limit and Thermal Protection
- Click fewer Transitions into and Out of Shutdown
- PCB Dimensions 31.59 x 28.42 mm
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This is a compact size, mono, switch-mode (Class-D) audio power amplifier intended for multimedia and general-purpose high-power applications. It has greater than 87% efficiency and is capable of delivering 2W maximum continuous power to a 4Ω load. The project is designed to be driven by the line-out or headphone jack of a CD/MP3 player or to be directly connected to any audio source. The project includes header connectors for speakers, power supply, and audio input for quick connection. The project also has 3x jumpers for frequency selection and shutdown action. The project is built using the MAX4295 chip.
Undervoltage Lockout
At low supply voltages, the MOSFETs in the H-bridge may have inadequate gate drive thus dissipating excessive power. The Undervoltage lockout circuit prevents the device from operating at supply voltages below +2.2Vdc.
Low-Power Shutdown Mode (Jumper J3 for Shutdown)
The MAX4295 has a shutdown mode that reduces power consumption and extends battery life. Driving SHDN low disables the H-bridge, turns off the circuit, and places the MAX4295 in a low-power shutdown mode. Connect SHDN to VCC using jumper 3 for normal operation.
Frequency Selection (Jumper J1 and J2 For Frequency Selection)
The MAX4295 has an internal logic-programmable oscillator controlled by FS1 and FS2 (see table below). The oscillator can be programmed to frequencies of 125kHz, 250kHz, 500kHz, and 1MHz. The working frequency should be chosen to best fit the user application. As a rule of thumb, choose fOSC to be 10x times the audio bandwidth. A lower switching frequency offers higher amplifier efficiency and lower THD but requires larger external filter components. A higher switching frequency reduces the size and cost of the filter components at the expense of THD and efficiency. In most applications, the optimal fOSC is 250kHz.
Connections and Other Details
- CN1: Pin 1 and Pin 2 = VCC, Pin and Pin 4 = GND (VCC Supply 2.7V to 5.5V DC)
- LS1: Pin 1 and Pin 2 = Speaker 1, Pin 3 and Pin 4 = Speaker 2
- CN2: Pin 2 Audio Signal Input, Pin 1 GND
- Jumpers J1 and J2: Frequency select pins FS1 and FS2. See Table for the shunt positions.
- Jumper J3: Shutdown selection, GND= Shutdown
- D1: Power LED
Features
- Operating Power Supply +2.7V to +5.5V Input Range (1.5A)
- 2W Channel Output Power at 5V
- 7W/Channel Output Power at 3V
- 87% Efficiency (RL = 4Ω, POUT = 2W)
- Programmable PWM Oscillator Frequency Selection (125kHz, 250kHz, 500kHz, 1MHz)
- Low 0.4% THD+N (RL = 4Ω, fIN = 1kHz, fOSC = 250kHz)
- Low-Power Shutdown Mode
- 1A Current Limit and Thermal Protection
- Click fewer Transitions into and Out of Shutdown
- PCB Dimensions 31.59 x 28.42 mm
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