Our Ask An Expert knowledge base contains answers to questions from designers like you. Browse the knowledge base by category or search key words. Not seeing what you need? Ask An Expert a question of your own.
I'm trying to design a fan control circuit with ADT7475 and three fans. I want to control with only one PWM signal and take 3 tach signals from each fans. The ADT7475 is the perfect IC for my application. On page 23, it describe how to control 3 fans with one PWM signal. I've designed with figure 33. And should i have to connect Vccp to Vcc?
Regarding the connection of the Vccp pin to Vcc, this should not be done as the Vccp pin should only be in the range of 0 to 3V. Your Vcc is 3.3V so this would not be viable. Vccp can be left unconnected unless the customer plans on using the THERM pin to boost the fans to 100%. In this case the Vccp pin will need to be connected to a voltage of 1V or above.
Answered by: ON Semiconductor
2011-06-15 17:55:47.0