PT8A3405/6 family is designed for CTHD (Constant Temperature Hair Dryer).

The chips implement temperature sensor input and 8-speed motor control. They can control devices to work with different wind speeds and different temperature.

The PT8A3405 has a VR input used for speed setting.

For PT8A3406, two keys connected PB-pin to implement Up/Down function to control speed. The chips control HEAT output levels according to NTC inputs and speed settings.

• 8-speed fan control
• Auto temperature control with NTC
• NTC open protect
• Zero cross to AC power line
• Low cost 16-pin DIP/SOIC package