EMULATED CURRENT RAMP FOR DC-DC CONVERTER

摘要

A voltage converter (FIG. 4) for a power supply circuit is disclosed. The voltage converter comprises a control circuit (400) coupled to receive an enable (EN) signal. The control circuit produces a first control signal (PWM) to provide a load current (IL) in response to the enable signal. A sample and hold circuit (408) is arranged to produce a third control signal (CSP) to emulate the load current and a fourth control signal (CSN′) to sample and hold value of the third control signal. A comparator circuit (416) is arranged to compare the third and fourth control signals and produce the enable signal in response to a result of the comparison.

主权项

1. A voltage converter, comprising:
a control circuit coupled to receive an enable signal, the control circuit producing a first control signal to provide a load current to an output terminal in response to the enable signal; a sample and hold circuit arranged to produce a third control signal to emulate the load current and a fourth control signal to sample and hold a value of the third control signal; and a comparator circuit arranged to compare the third and fourth control signals and produce the enable signal in response to a result of the comparison.