| 摘要 |
The present invention relates to a current mode DC/DC converter provided with a current mode control circuit 51, serving as a feedback circuit for stabilizing an output voltage Vo supplied to a load resister RL, which detects a coil current I2 flowing through a choke coil L1 and control switching operation of a switching element Q1 according to a result of comparison between a detection signal of the coil current I2 and an error signal from an error amplifier A1 serving as a reference signal. The current mode control circuit 51 is provided with a feed forward circuit 41 which detects a variation in a load current Io flowing through a load resister RL and adds the variation to the detection signal of a coil current I2. Accordingly, a switching pulse, by which the coil current I2 changes quickly in response to an abrupt change in the load current Io, can be fed to the switching element Q1.
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