Renesas Electronics America Inc.

Xiaodong Zhan

Long Yu

Prabhjot Singh

Jin Yang

Pengcheng Tang

Jianhua Yang

Methods and apparatuses for regulating a power converter are described. A device comprising a control circuit and a logic circuit can be integrated in a controller coupled to the power converter. The control circuit can generate a constant off-time signal based on a ramp signal and an error signal. The logic circuit can generate a control signal based on the constant off-time signal and a constant on-time signal. The logic circuit can output the control signal to the power converter. In response to an on-time period of the constant off-time signal being less than an on-time period of the constant on-time signal, the control signal can vary according to the constant on-time signal. In response to the on-time period of the constant off-time signal being greater than the on-time period of the constant on-time signal, the control signal can vary according to the constant off-time signal.

Power converter in peak current mode constant-off time control

The present embodiments relate generally to DC-DC converters and more particularly to a scheme for providing current sharing between parallel converters in a multiphase configuration. In some embodiments, a cycle-by-cycle instant correction to the compensation signal offset is provided based on the current share error between the paralleled converters so as to achieve improved instant current share performance.

Current sharing scheme in current mode control for multiphase DC-DC converter

A converter includes a buck boost converter circuit to generate an output voltage in response to an input voltage, and an inductor current compensation circuit to generate an output current compensated inductor current signal corresponding to a sensed input current. The output current compensated inductor current signal includes a voltage gap between a boost ramp valley and a buck ramp peak. The buck boost converter circuit includes a current sensor to receive the input voltage, the current sensor to sense an input current corresponding to the input voltage, an upper buck transistor coupled to the input voltage node, an upper boost transistor coupled to an output voltage node to output the output voltage, and an inductor coupled between the upper buck transistor and the upper boost transistor. The inductor current compensation circuit adjusts the voltage gap based on an offset compensation voltage corresponding to a switching frequency.

Ramp offset compensation circuit in a buck boost converter

A buck boost converter includes a buck boost converter circuit to generate an output voltage in response to an input voltage, and a mode control logic circuit to generate a mode control signal to control an operation mode of the buck boost converter circuit to operate in one of a buck mode, a boost mode, and a buck-boost mode. The buck boost converter circuit includes an upper buck transistor coupled to an input voltage node, the input voltage node to receive the input voltage, an upper boost transistor coupled to an output voltage node, the output voltage node to output the output voltage, and an inductor coupled between the upper buck transistor and the upper boost transistor. The mode control signal is generated based on a first duty cycle of the upper buck transistor and a second duty cycle of the upper boost transistor.

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McKinney, TX, United States of America

Xiaodong Zhan