US Patent No. 9,667,264

TRANSITION TIMING CONTROL FOR SWITCHING DC/DC CONVERTER


Patent No. 9,667,264
Issue Date May 30, 2017
Title Transition Timing Control For Switching Dc/dc Converter
Inventorship Brian K. Jadus, Williston, VT (US)
Assignee LINEAR TECHNOLOGY CORPORATION, Milpitas, CA (US)

Claim of US Patent No. 9,667,264

1. A DC/DC converter for providing power to a load device, the load device having a first operational phase that is sensitive
to external injected noise and a second operational phase that is immune to the external injected noise, the DC/DC converter
comprising:
a coil;
a switch for controlling current in the coil;
a first input terminal that receives a start signal of the first operational phase for the load device; and
control circuitry, responsive to the start signal, for controlling the switch to avoid switching by the switch during the
first operational phase;

wherein the switch controls the frequency of the current to the coil;
further comprising a counter to increment or decrement a counter value during a half period of the switching frequency of
the switch, the switching frequency being 1/(2×half period); and

wherein the control circuitry is, responsive to the start signal, to compare the counter value with reference values to control
the switching frequency of the switch.