Clarification Request

collinsemasi

collinsemasi

what

flux

Could you clarify what you’d like help with?
shadow09

shadow09

Could you explain Q3 Ckt

flux

Here’s how the Q3 circuit works:
  • Q3 is an N-channel MOSFET (SSM3K15ACTC,L3F)
    • Pin 1 Gate (G) on net “DescriptiveNet48” via series resistors R13/R14
    • Pin 2 Source (S) tied to GND
    • Pin 3 Drain (D) on “Net 50”
  • Net 50 fans out to R15, R16, R17, which are the current-limit resistors for the red, green, and blue LEDs of LED1.
  • With gate driven high by the MCU (through R13/R14), Q3 conducts, sinking LED currents to ground and turning LEDs on. When the gate is low or floating, Q3 is off, isolating the LEDs.
  • A pull-down (R13/R14) on the gate follows best practice: ensure Q3’s gate never floats, so the MOSFET reliably stays off when the MCU pin is tri-stated.
Show me Q3 context
Explain Net 50 load
Check MOSFET suitability
Gate resistor/pulldown values
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