Patent ID: 9647541
Date: 2017-05-09
CPC Classifications: H02M

Claim:
1. A hysteretic control DC/DC converter apparatus, comprising: a voltage input; a voltage output; a coupling circuit that couples said voltage input to said voltage output; a switch coupled between a fixed potential and a node in said coupling circuit, said switch having a control input that receives a control signal having a frequency, wherein said switch is responsive to said control signal for alternately connecting said node to said fixed potential and disconnecting said node from said fixed potential in accordance with said frequency; and a further circuit coupled between said node and said control input, said further circuit configured to generate said control signal based on a node voltage at said node, wherein said further circuit is coupled to said voltage output and configured to produce a voltage signal by adding a ripple signal to a feedback voltage that is proportional to an output voltage at said voltage output which is compared with a reference voltage, and to cause said control signal to direct said off state when said voltage signal exceeds a further reference voltage, wherein the further circuit utilizes an adaptive off time control scheme, where the control switch is turned on when the off timer expires, it is turned off when the feedback voltage plus injected ripple exceeds the reference voltage.