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Schematic

Layout

3D View

Phase Output Simulation
Functional and enhanced simulations of the three ESC motor output pads: A_PAD, B_PAD, and C_PAD.
Schematic Mapping

Table

Output padDriverMOSFET pairSwitch node
A_PADU2 / MP1907AGQ-PQ1, Q2 / TPN2R703NLPhase A
B_PADU4 / MP1907AGQ-PQ3, Q4 / TPN2R703NLPhase B
C_PADU5 / MP1907AGQ-PQ5, Q6 / TPN2R703NLPhase C
Baseline Ideal Six-Step Model
Initial idealized assumptions:
  • VBAT = 12 V
  • PWM frequency = 20 kHz
  • PWM duty cycle = 60%
  • Electrical commutation frequency = 1 kHz
  • Duration = 2 ms
  • Time step = 1 µs
  • Each 60° sector drives one phase high-side PWM, one phase low-side ON, and one phase floating / high-Z
Baseline phase-to-ground results ignoring floating / high-Z samples:

Table

OutputAverageRMS
A_PAD3.7725 V6.7283 V
B_PAD3.5495 V6.5265 V
C_PAD3.4775 V6.4599 V
Baseline phase-to-phase peak values:

Table

MeasurementMinimumMaximumPeak absolute
Vab-12.0000 V12.0000 V12.0000 V
Vbc-12.0000 V12.0000 V12.0000 V
Vca-12.0000 V12.0000 V12.0000 V
Baseline output files:
Enhanced Inverter + Motor Winding Model
This rerun adds motor winding R/L, MOSFET on-resistance, dead time, and simple diode clamping.
Assumptions:
  • VBAT = 12 V
  • PWM frequency = 20 kHz
  • PWM duty cycle = 60%
  • Electrical commutation frequency = 1 kHz
  • Duration = 2 ms
  • Time step = 50 ns
  • TPN2R703NL RDS(on) = 2.7 mΩ per MOSFET when on
  • Dead time = 300 ns at PWM switching transitions
  • Motor winding phase-to-neutral resistance = 80 mΩ
  • Motor winding phase-to-neutral inductance = 15 µH
  • Wye-connected motor with floating neutral
  • No back-EMF and no rotor/load dynamics
  • Simple body-diode clamp approximation at about -0.7 V and VBAT + 0.7 V
  • Six-step commutation sequence: A+ B-, A+ C-, B+ C-, B+ A-, C+ A-, C+ B-
Enhanced pad voltage results:

Table

PadMinimumMaximum
A_PAD-0.7893 V12.7872 V
B_PAD-0.7858 V12.7851 V
C_PAD-0.7893 V12.7755 V
Enhanced phase current results:

Table

CurrentMinimumMaximumRMS
ia-33.0698 A33.0667 A21.8347 A
ib-31.6987 A31.7908 A20.6008 A
ic-33.0667 A33.0698 A21.1606 A
Enhanced phase-to-phase voltage results:

Table

MeasurementMinimumMaximum
Vab-13.5567 V12.7872 V
Vbc-13.5510 V12.7850 V
Vca-13.5744 V12.7754 V
Estimated MOSFET conduction loss using I² × RDS(on), commanded-on devices only:

Table

ItemAverage loss
Total inverter over full 2 ms2.6505 W
Phase A, full-time average0.9459 W
Phase B, full-time average0.7963 W
Phase C, full-time average0.9082 W
Phase A, average while on1.7544 W
Phase B, average while on1.5137 W
Phase C, average while on1.7374 W
Enhanced output files:
Limitations
The enhanced model is still a behavioral simulation. It does not include:
  • Exact MP1907 gate-driver propagation delays, bootstrap refresh limits, UVLO, or real gate-drive current
  • TPN2R703NL capacitances, nonlinear body diode behavior, reverse recovery, avalanche, or temperature-dependent RDS(on)
  • PCB trace/via/package parasitics, ringing, overshoot, or EMI behavior
  • Motor back-EMF, rotor position, torque load, or BLHeli_S timing details
  • Current limiting, desaturation behavior, or firmware protection loops
Use this simulation to understand expected phase-node switching and first-order motor current behavior. Use a transistor-level SPICE model plus measured motor parameters for switching-loss, thermal, and EMI validation.

  • Schematic Mapping

  • Baseline Ideal Six-Step Model

  • Enhanced Inverter + Motor Winding Model

  • Limitations