Abstract: Provided is a controller circuit of a step-down DC/DC converter, the controller circuit including a ramp voltage generating circuit that generates a periodic ramp voltage, a clamp voltage generating circuit that generates a clamp voltage, an error amplifier that generates an error signal that depends on an error between an electrical state of the step-down DC/DC converter and a target state of the electrical state, a clamp circuit that clamps the error signal by using the clamp voltage, and a pulse width modulation comparator that compares the error signal resulting from the clamping by the clamp circuit with the ramp voltage. The ramp voltage generating circuit includes a first capacitor, a first current source, a switch, a second capacitor, and a driver circuit. The clamp voltage generating circuit includes a third capacitor, a fourth capacitor, a first resistor, and a second current source.

Abstract: A misfire determination apparatus for an internal combustion engine including a rotational speed detector detecting a rotational speed of an engine and a microprocessor. The microprocessor is configured to perform calculating a misfire parameter having a correlation with a change amount of the rotational speed in a combustion stroke of each of a plurality of cylinders and increasing as an increase amount of the rotational speed is large based on the rotational speed detected by the rotational speed detector, and determining that a single-cylinder misfire has occurred when the misfire parameter is less than a first predetermined value, while determining that the single-cylinder misfire or a multi-cylinder misfire has occurred when the misfire parameter is less than a second predetermined value greater than the first predetermined value.

Abstract: Provided is a controller circuit of a buck DC/DC converter. The controller circuit includes a feedback pin to be connected to an output line of the buck DC/DC converter, a voltage divider circuit including a first resistor and a second resistor connected in series between the feedback pin and a ground, a feedback circuit that generates a pulse modulation signal to bring a feedback voltage as an output of the voltage divider circuit close to a reference voltage, and a current source that is connected to the feedback pin and supplies a constant current.

Abstract: Provided is an analog switch circuit including an intermediate node, a first PMOS transistor including a source connected to the input node and a back gate and a drain connected to the intermediate node, a second PMOS transistor including a source connected to the output node, a back gate and a drain connected to the intermediate node, and a gate connected to a gate of the first PMOS transistor, a first NMOS transistor including a source grounded and a drain connected to the gates of the first PMOS transistor and the second PMOS transistor, a third PMOS transistor connected between the intermediate node and the drain of the first NMOS transistor, a first resistor connected between the gate of the first NMOS transistor and a ground, and a driver including an input that receives the control signal and an output connected to the gate of the first NMOS transistor.

Abstract: Disclosed here is a linear regulator circuit including an input line, an output line, a P-channel output transistor connected between the input line and the output line, a feedback circuit that performs feedback control on a gate voltage of the output transistor such that an output voltage of the output line approaches a target level, and a protective circuit that clamps the gate voltage of the output transistor such that the gate voltage does not fall below a voltage level lower than the output voltage by a predetermined voltage.

Abstract: An HVAC system including a front blower having a first front blower outlet and a second front blower outlet. The first front blower outlet and the second front blower outlet are arranged vertically relative to one another. A joint duct includes a first body portion and a second body portion. The first body portion includes a first duct inlet, which is connected to the first front blower outlet, and a first duct outlet. The second body portion includes a second duct inlet, which is connected to the second front blower outlet, and a second duct outlet. The first duct outlet and the second duct outlet are arranged horizontally relative to one another. An HVAC case defines a first inlet and a second inlet arranged horizontally relative to one another. The first duct outlet is connected to the first inlet, and the second duct outlet is connected to the second inlet.

Abstract: A heating, ventilation, and air conditioning (HVAC) system for a vehicle. The HVAC system includes an HVAC case. The HVAC case has a first inlet and a second inlet. The first inlet is in receipt of airflow from a front blower. The second inlet is in receipt of airflow from a rear blower. A front foot outlet directs airflow towards the feet of occupants at a front of the vehicle. A rear foot outlet directs airflow from the rear blower towards a rear of the vehicle. A rear-to-front airflow control door is movable to direct airflow generated by the rear blower and heated by a heater core through the rear foot outlet, through the front foot outlet, or simultaneously through both the rear foot outlet and the front foot outlet.

Abstract: A vehicle heating, ventilation, and air conditioning (HVAC) unit. The vehicle HVAC unit includes an evaporator, a driver side face outlet, and a passenger side face outlet. A face airflow control door extends across both the driver side face outlet and the passenger side face outlet. A divider separates a driver side airflow path from a passenger side airflow path. The driver side airflow path extends across the evaporator to the driver side face outlet, and the passenger side airflow path extends across the evaporator to the passenger side face outlet. A passenger side airflow control door is within the passenger side airflow path between the face airflow control door and the evaporator. The passenger side airflow control door is movable to block airflow through the passenger side airflow path to the passenger side face outlet.

Abstract: An HVAC system including a front blower having a first front blower outlet and a second front blower outlet. The first front blower outlet and the second front blower outlet are arranged vertically relative to one another. A joint duct includes a first body portion and a second body portion. The first body portion includes a first duct inlet, which is connected to the first front blower outlet, and a first duct outlet. The second body portion includes a second duct inlet, which is connected to the second front blower outlet, and a second duct outlet. The first duct outlet and the second duct outlet are arranged horizontally relative to one another. An HVAC case defines a first inlet and a second inlet arranged horizontally relative to one another. The first duct outlet is connected to the first inlet, and the second duct outlet is connected to the second inlet.

Abstract: A heating, ventilation, and air conditioning (HVAC) system for a vehicle. The HVAC system includes an HVAC case. The HVAC case has a first inlet and a second inlet. The first inlet is in receipt of airflow from a front blower. The second inlet is in receipt of airflow from a rear blower. A front foot outlet directs airflow towards the feet of occupants at a front of the vehicle. A rear foot outlet directs airflow from the rear blower towards a rear of the vehicle. A rear-to-front airflow control door is movable to direct airflow generated by the rear blower and heated by a heater core through the rear foot outlet, through the front foot outlet, or simultaneously through both the rear foot outlet and the front foot outlet.