US 11,863,069 B2
Selective stopband avoidance in switching converter controller
Puneet Sareen, Freising (DE); Michael Känner, Munich (DE); Christian Harder, Freising (DE); and Narayanan Seetharaman, Unterschliessheim (DE)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Nov. 30, 2021, as Appl. No. 17/537,802.
Prior Publication US 2023/0170798 A1, Jun. 1, 2023
Int. Cl. H02M 3/157 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/157 (2013.01) [H02M 1/0041 (2021.05)] 18 Claims
OG exemplary drawing
 
1. A switching converter controller comprising:
a stopband controller having a stopband controller input and a stopband controller output, the stopband controller input is configured to receive a reference signal, and the stopband controller is configured to:
store a programmable number of predetermined stopbands;
compare a frequency value determined from the reference signal to the programmable number of predetermined stopbands; and
output a stopband detected signal to the stopband controller output responsive to the frequency value being within one of the programmable number of predetermined stopbands;
a pulse-frequency modulation (PFM) controller having a first PFM controller input, a second PFM controller input and a PFM controller output, the first PFM controller input configured to receive a feedback error signal, the second PFM controller input coupled to the stopband controller output, and the PFM controller configured to selectively adjust a clock signal at the PFM controller output based on the feedback error signal and the stopband detected signal; and
a driver circuit having a driver circuit input and a driver circuit output, the driver circuit input coupled to the PFM controller output and configured to receive the clock signal, and the driver circuit output adapted to be coupled to a power stage switch.