Descrição
The NCT3940S/ NCT3940S-A is a simply linear fan driver. It is designed for noise-sensitive or power-sensitive applications that require system cooling. The NCT3940S/ NCT3940S-A is a low quiescent current, low dropout linear regulator which is designed with a P-channel MOSFET to power a DC fan and delivers output current up to 500mA. The output voltage follows the 1.6 times on the voltage of VSET pin to dynamic adjust the DC fan speed. NCT3940S supports enable pin to control the output voltage. NCT3940S-A is power-on by the VSET pin voltage threshold and supports fully turn-on function. The internal power MOSFET can be fully turned on directly when FON# is at low level. NCT3940S/ NCT3940S-A is available in SOP-8 package.
