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imsmooth
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Other than some power loss, is there anything wrong with just putting a capacitor across the drain-source, instead of a resistor/capacitor?
Putting a capacitor across the drain-source
- Thread starter imsmooth
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- Capacitor
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Discussion Overview
The discussion revolves around the implications of placing a capacitor across the drain-source of a MOSFET in a circuit, particularly in relation to power loss and circuit performance. Participants explore the context of this configuration, including its effects on ringing and switching efficiency.
Discussion Character
- Technical explanation
- Debate/contested
- Experimental/applied
Main Points Raised
- One participant questions whether there are issues beyond power loss when using a capacitor across the drain-source instead of a resistor-capacitor combination.
- Another participant requests clarification on the specific circuit application and provides a link to a schematic involving MOSFETs.
- A participant notes that a capacitor across the gate-source leads can reduce ringing but seeks to understand the potential problems of omitting a resistor.
- References to external resources on snubber circuits are shared, with one link discussing the use of a capacitor-only snubber.
- Some participants argue that while adding capacitance can be beneficial in certain resonant outputs, it generally introduces losses and reduces switching efficiency, suggesting that tighter circuit design may be preferable.
Areas of Agreement / Disagreement
Participants express differing views on the appropriateness of using a capacitor alone versus a resistor-capacitor combination, indicating that the discussion remains unresolved with multiple competing perspectives on the topic.
Contextual Notes
Participants highlight the importance of circuit context, noting that the effects of capacitance may vary depending on specific circuit configurations and conditions, such as resonance and switching characteristics.