公开(公告)号：US20190288675A1

公开(公告)日：2019-09-19

申请号：US16296545

申请日：2019-03-08

Applicant: uPI semiconductor corp.

Inventor： CHIH-LIEN CHANG ,  MIN-RUI LAI

IPC: H03K7/08

Abstract: 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.

公开(公告)号：US20190245447A1

公开(公告)日：2019-08-08

申请号：US16259707

申请日：2019-01-28

Applicant: uPI semiconductor corp.

Inventor： CHIH-LIEN CHANG ,  MIN-RUI LAI

IPC: H02M3/158 ,  H03K7/08 ,  H02M1/14

Abstract: A DC-DC converting controller coupled to an output stage and an external resistor network and providing a pulse-width-modulation (PWM) signal to control the output stage to provide an output voltage is disclosed. The DC-DC converting controller includes a sensing circuit, a droop current circuit, a first pin and a PWM signal control loop. The sensing circuit, coupled to the output stage, provides a sensing current. The droop current circuit, coupled to the sensing circuit, provides a droop current according to the sensing current. The first pin, coupled to the droop current circuit and external resistor network, provides the droop current to make the external resistor network provide a second reference voltage. The PWM signal control loop, coupled to the external resistor network, generates a PWM signal according to the output voltage and the second reference voltage. The droop current is reduced to a default value with a default time.