A DC-DC Converter using a high speed soft-start control circuit

In this paper, a high speed soft-start control circuit is proposed to implement the Current-Mode DC-DC Converter. The time for the soft-start does not depend on the load condition from no load to the maximum load current. The proposed circuit consists of SS_RAMP, VREF_RAMP and a small differential-voltage generator. The SS_RAMP is a piecewise linear voltage that has four different ramps. The VREF_RAMP is a linear ramp voltage. The HSPICE simulation results show that the proposed high speed soft-start control circuit to implement to the Current-Mode DC-DC Converter achieved 150μs and has been shortened to 1/50 compared with a commonly available high performance converter which achieves in about 7.5 ms.