[IDEA] Class-D Multichannel amplifier
During my net surfing i have discovered this very interesting - IMHO - chip (produced by MAXIM
) called MAX13301
- High Output Power (10% THD+N)
- 2 x 160W into 2Ω at 24V
- 4 x 80W into 4Ω at 24V
- 2 Channels Can Be Paralleled
- Feedback After the Filter
- Improves THD+N
- Low Output Impedance
- High-Frequency Response
- Improved Damping of Complex Loads
- Enables Low-Cost Inductors
- 102dB SNR
- Low 0.04% THD+N
- 70dB PSRR
- On-Board Diagnostics
- Open/Shorted Load
- Tweeter Detect
- Protection and Monitoring Functions:
- Short-Circuit Protection
- 50V Load-Dump Protection
- Programmable Clip Detection
- DC Offset Detection
- Open Battery/GND Tolerant
- Thermal-Overload Protection
- Thermal Warning Indication
- Four-Address I²C Control Interface
- Low-Power Shutdown Mode
- Up to 90.5% Efficiency
- -40°C to +125°C Ambient Operating Temperature
- 48-Pin TSSOP-EPR (Top Side Exposed Pad) Package
- AEC-Q100 Qualified
...and if you check the datasheet (here's the PDF
), here's another interesting feature:
The device supports fixed-frequency modulation with an internal or external clock. The modulation mode is selected through CTRL1.CM[1:0] (operating mode select bits).
In master mode, 10 modulation frequencies are available in fixed-frequency modulation mode. Program CTRL0.MDIV[3:0] (master clock-divide ratio bits) for the desired frequency.
Configuring the device as a slave allows an external clock source to provide the switching frequency. In this case, apply the external clock signal at SYNC at double the desired switching frequency.
Not only: it also has diagnostic functions, speakers protection, and I2C interface (that should let you control it through a serial interface).
Unfortunally i'm not an electronic enginner nor able to develop a circuit, but it would be very interesting to have "something" based on it.