Schematic Review and Corrections

Thought for 4 mins 40 sec

Short answer: No issues. With 12 V drive, 10 Ω series + 100 kΩ pulldown gives nanosecond-scale edges and milliwatt-level dissipation, well within 0603 ratings and within the driver’s capability.

Data from datasheets

MIC4127YME: dual driver, supply 4.5–20 V, peak source/sink 1.5 A (Microchip datasheet).
Q1/Q2 DMT3020LDV-7: total gate charge Qg typ = 7.0 nC at VGS = 10 V (Diodes Inc. datasheet).

Computed results (per FET, fPWM = 20 kHz, Vdrive = 12 V, Rg = 10 Ω)

Effective gate capacitance (from Qg): Ceff = Qg/V ≈ 0.7 nF.
Time constant: τ = Rg·Ceff ≈ 7 ns; rise-time 95% ≈ 3τ ≈ 21 ns; 99% ≈ 5τ ≈ 35 ns. This is about 0.07% of a 20 kHz period (50 µs), so switching speed is more than adequate.
Series resistor power (average): P_R ≈ Qg·V·f = 1.68 mW. Versus 0603 0.1 W rating, margin is huge.
Series resistor peak current at t=0: I_PEAK ≈ V/Rg = 1.2 A, within MIC4127YME’s 1.5 A peak rating.
Pulldown (100 kΩ) DC dissipation when gate is high: P_MAX = V²/R = 1.44 mW (at 100% duty). At 50% duty ≈ 0.72 mW. Also far below 0.1 W.

Actionable notes

Keep the 10 Ω series parts close to the MOSFET gates to damp ringing and reduce EMI.
The pulldown should reference the MOSFET source node (if the source is not hard-GND in all states) to avoid any chance of excessive negative VGS during transients.
With your 12 V drive and these values, no rise-time or power concerns are expected at 20 kHz.

frek

@calculator 按40kHz PWM再算一次每路栅极电阻平均功耗和驱动损耗。

Thought for 2 mins 51 sec

flux

计算基于 Qg = 7 nC（在 10 V 规格处取典型值）、Vdrive = 12 V、Rg = 10 Ω、fPWM = 40 kHz。结果为每路一只 MOSFET 的估算。

结果

栅极驱动总损耗 Pgate ≈ Qg · Vdrive · f = 3.36 mW
栅极串联电阻平均功耗 PRg（上界，假设驱动器输出内阻远小于 10 Ω，能量主要在 Rg 上耗散）≈ 3.36 mW
驱动器内部动态损耗 Pdriver ≈ Pgate · Rdriver / (Rg + Rdriver)
- 需数据手册给出 Rdriver（高、低端导通电阻）。若 Rdriver 远小于 10 Ω，则 Pdriver 仅占小部分；如需精算我可以拉取数据表参数代入。
100 kΩ 下拉电阻功耗（与频率无关，取占空 D）: Ppd = D · Vdrive² / 100 kΩ
- D = 100% 时 Ppd = 1.44 mW；D = 50% 时 Ppd = 0.72 mW

说明

上述 3.36 mW 同时也是“每周期门极充放电能量 Q·V 的平均功率”在 40 kHz 下的值；作为 PRg 的上界是合理、保守的布局热设计依据。
若需要把 PRg 与 Pdriver 分摊到更精确的数值，请确认 MIC4127YME 输出级的典型导通电阻（高、低侧），我可以据此给出精确分摊并核对峰值电流与热负载余量。

补充缺失参数

分摊驱动器内阻

核对峰值门极电流

计算下拉电阻损耗

选电阻封装功率

3V3

XL1509-ADJE1

100nF

Capacitance

100pF

10nF

Capacitance

100pF

47uH

Inductance

Resistance

500 Ω

6.8K

Resistance

500 Ω

SS34

Reviews

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Project Name

Volumetric: Wifi LED Strip controller

Description

Wi-Fi LED strip controller made with few goals:

Dual voltage support 12V and 24V 2 independent channels for color temperature adjustments No high pitch noise in all modes Powerful enough to handle current up to 17.5A (in total, limited by connectors) Control buttons on the device body Connectors for external buttons Can be used with already installed LED strips Support of open source firmware, like https://esphome.io/

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Digi-Key	$0.37–$1.08
LCSC	$0.38
Mouser	$1.08

Controls

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