Patent ID: 6285174
Filing Date: 2001-09-04
Classification: H02M

Abstract:
An on-time signal generation circuit for use in a switching DC-to-DC converter having an input potential V.sub.in, an output potential, and a switching period T.sub.osc during steady state operation, said on-time generation signal circuit comprising:a comparator having a first input and a second input;a ramp generator having an output coupled to the first input of the comparator and an input coupled to receive the input potential V.sub.in, wherein the ramp generator is configured to assert at said output a periodic ramped potential, having peak level kV.sub.in +V.sub.offset and period T.sub.osc, in response to said input potential V.sub.in, wherein V.sub.offset can but need not have a nonzero value; andan amplifier having an amplifier output coupled to the second input of the comparator and an amplifier input coupled to receive an amplifier input potential V.sub.out, wherein the amplifier input potential is one of the output potential and a DC potential proportional to a desired level of the output potential, and wherein the amplifier is configured to assert at the amplifier output an amplified potential kV.sub.out in response to the amplifier input potential V.sub.out.