User Manual Q&AAnswer
Mar 22, 2025 - 01:30 AM
The M2 Output Stage Analysed Board is designed to operate in Class AB and utilizes specific components to enable this mode of operation. According to the official M2 schematics and hints provided by Nelson Pass, the following components play a role in achieving Class AB operation:
1. Components D1, D2, D3, Q6, and Q7: These components are responsible for enabling the Class AB operation of the board. They help regulate the biasing of the MOSFETs and ensure that the output stage operates in the desired mode.
2. LM385: This component, when included in the circuit, helps maintain a stable voltage across the optocoupler LED. It prevents the pull-down effect caused by the Class B output current and ensures proper biasing of the MOSFETs.
3. MOSFETs: The MOSFETs used in the M2 Output Stage Analysed Board have a Yfs (transconductance) value of approximately 2.3S. To increase the current from the default bias of 1.3A to 5A, a Vgs (gate-source voltage) of around 6.7V is required.
4. Source Resistor: The voltage drop across the source resistor is taken into account when determining the required Vgs for the MOSFETs. This voltage drop, along with the DC voltage across capacitor C3, helps provide the necessary voltage for proper operation.
By incorporating these components and considering their effects on biasing and voltage regulation, the M2 Output Stage Analysed Board is able to operate in Class AB and deliver the desired performance. It is important to follow the recommended component values and specifications mentioned in the user guide for optimal operation of the board.
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