McClure, Qualey & Rodack, LLP
Pulse-width modulation controller and tri-state voltage generation method
A pulse-width modulation (PWM) controller including an output pin, a temporary voltage generation circuit and a tri-state voltage generation circuit is disclosed. The temporary voltage generation circuit includes a voltage-dividing unit and a control unit. The voltage-dividing unit is coupled to the output pin and the control unit respectively. The control unit receives an enable signal and a PWM signal. The tri-state voltage generation circuit is coupled to the temporary voltage generation circuit and the output pin and receives the enable signal, the PWM signal and a tri-state input voltage. When the PWM controller is operated in a tri-state mode, the control unit controls the voltage-dividing unit to provide a temporary voltage to the output pin according to the enable signal and PWM signal, and then the tri-state voltage generation circuit provides a tri-state voltage to the output pin according to the enable signal and PWM signal.
UPI SEMICONDUCTOR CORP.
H H Y H
H03K H02M Y02B H03K
inventional additional additional inventional
Min-Rui Chih-Lien
Lai Chang