珠海超星半导体有限公司

Variable-frequency fans are widely used in industrial production and household applications. Their working principle involves adjusting the frequency and voltage of the input signal through an inverter to control the motor's rotational speed, which in turn drives the fan blades to generate airflow. This speed regulation method offers advantages such as high flexibility, high energy efficiency, stable airflow, and low noise.

A variable-frequency fan utilizes variable frequency technology for speed regulation. By altering the motor's operating frequency, it changes the fan's rotational speed, thereby achieving adjustable airflow. This approach retrofits conventional fixed-speed motors into variable-frequency compatible motors controlled via an inverter.

Application Example: High-Efficiency Low-Noise Fan Motor Drive Solution

Device Model: HM8324F4X100 (N+P-Channel Dual MOSFET)

Application Field: Household/Industrial Electric Fan Motor Drive

I. Industry Requirements:

Electric fan motor drives must meet:

1.High Inrush Current

(Instantaneous current reaching 3-5 times rated value)

2.PWM Speed Control Requirement

(For energy saving & multi-level operation)

3.Thermal Management in Compact Spaces

4.Low-Noise Operation

(Switching noise impacts user experience)

II. Solution Advantages

✅ Dual-Channel Design:

• N-channel (30V/18A) for forward motor drive

• P-channel (-30V/-14A) for braking/reversal control

• Ultra-Low RDS(on):
  

• N-ch: 14mΩ @10V (reduces conduction loss by 35%)

• P-ch: 29mΩ @10V (optimizes braking efficiency)

✅ PWM Speed Control Optimization:

• Ultra-fast switching (td(on)=11.1ns, tf=3.6ns)

• Low gate charge (Qg=12nC) → minimizes switching loss

• Supports >20kHz PWM frequency (eliminates audible noise)

✅ Superior Thermal Management:

• TO-252 package (surface-mount, space-saving)

• Low thermal resistance: 4.6°C/W (P-channel)

• 150°C junction temperature tolerance → passes motor stall test

✅ Reliability Assurance:

• 50A pulse current capability (withstands startup surges)

• Integrated body diode (VSD<1.2V) provides freewheeling path

III. Design Key Points

1.Drive at VGS=10V to ensure minimized RDS(ON)

2.Utilize Ciss <600pF characteristic to simplify gate drive circuitry

3.Copper heatsink area ≥15mm² (supporting 27W power dissipation)

IV. Measured Performance

V. Customer Value

1. Energy Efficiency Improvement

System efficiency >92% (at 12V/8A operating condition)

2. Extended Lifespan

Reduced thermal stress → MTBF >50,000 hours

3. Cost Optimization

Dual-MOSFET integration reduces PCB area by 40%

4. Acoustic Compliance

Certified to EN60730 Class A noise standard

Recommended Product Selection Table for Motor Drive Applications: Low-Voltage MOSFET Series