This is the circuit design of a Class D power audio amplifier using IC MD7120 as a MOSFET driver. MD7120 is used to drive four N-channel MOSFET transistors operating on both sides of the H-bridge switch. It consists of a controller logic circuit, a level shifter, two bootstrap powered high-side gate drivers, two VDD powered low-side gate drivers, and an overcurrent protection circuit (without using a current sense resistor). The overcurrent protection thresholds for both the high and low sides are individually resistor programmable.
The MD7120 is designed to drive 3.0A fast switching MOSFETs with well matched input to output propagation delays between high and low sides and from channel A to channel B. The circuit uses a direct coupling approach in its internal level shifter from the logic input to the gate of the N-channel power MOSFET.
The MD7120 input logic voltage can be set to any voltage between 1.8 and 5.0V by connecting the EN pin H logic voltage level to the same level as the switch control input. The internal EN pin circuit will calculate the logic threshold when high and disable the output when low. The MD7120 is packaged in a low inductance, heat-resistant, 32-pin, 7.00×7.00mm QFN package. If a suitable PCB heat sink is used, the IC power dissipation is approximately 3.5W.
The high-side power MOSFET drain can be connected to a high voltage supply, while the bottom N-channel MOSFET source is grounded if connected to a single high voltage supply. In this case, the digital audio signal processor IC output can be directly connected to the MD7120 input with a ground reference level without the need for a level shifter. However, the speaker or single channel output reference cannot be grounded.
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