The electrically controlled elements are the blower fan motor and flap valves that divert the airflow.

The blower fan motor is usually a simple brushed DC motor, with its speed controlled by a MOSFET operating in PWM or linear mode. The flap valves are usually controlled by an integrated IC.

Key MOSFET Requirements:

• Switching capability for PWM control
• Low package thermal resistance
• Low on-resistance
• Good current handling

LFPAK56 is well suited to HVAC applications due to excellent current handling and thermal performance.

Main benefits:

• Robust product using advanced copper clip technology
• Excellent current handling
• Low on-resistance

I2PAK & TO-220 are ideal solutions for HVAC systems where through-hole mounting is used to optimise thermal performance and current handling.

Main benefits:

• Separate current and thermal paths
• CVlamp, screw and solder mounting
• Low on-resistance
• High current handling capability

BUK7610-55AL is specifically designed for thermally stable linear mode control applications.