公开(公告)号：US20090160416A1

公开(公告)日：2009-06-25

申请号：US12333450

申请日：2008-12-12

申请人： Norihiro Kawagishi ,  Yuichi Okubo

发明人： Norihiro Kawagishi ,  Yuichi Okubo

IPC分类号： G05F1/46

CPC分类号： H02M3/156 ,  H02M2001/0025

摘要： A DC-DC converter generates an optimal slope compensation voltage in response to input and output voltages, thus capable of maintaining its operational stability even when a dynamic range of the output voltage is widen. The DC-DC converter compares an error voltage corresponding to a difference between a feedback voltage of the output voltage and a reference voltage with a ramp signal whose voltage level corresponds to a current detection signal, so as to configure an off-timing of an output transistor. A slope of the ramp signal is configured so that the ramp signal is proportional to a difference between the output voltage and the input voltage. A slope compensation circuit for generating the ramp signal includes an adding circuit for generating a slope controlling electric current corresponding to a voltage in which a voltage corresponding to the input voltage is subtracted from a voltage corresponding to the output voltage, and a capacitor electrically charged with the slope controlling current.

摘要翻译： DC-DC转换器响应于输入和输出电压产生最佳斜率补偿电压，因此即使当输出电压的动态范围变宽时也能保持其运行稳定性。 DC-DC转换器将对应于输出电压的反馈电压和参考电压之间的差的误差电压与其电压电平对应于电流检测信号的斜坡信号进行比较，以便配置输出的断开定时 晶体管。 斜坡信号的斜率被配置为使得斜坡信号与输出电压和输入电压之间的差成比例。 用于产生斜坡信号的斜坡补偿电路包括一个加法电路，用于产生一个斜率控制电流，该斜坡控制电流对应于一个电压，在该电压中，从与输出电压相对应的电压中减去对应于输入电压的电压， 斜率控制电流。