US 9,812,973 B2
Method and apparatus for a control circuit with multiple operating modes
Stefan Bäurle, San Jose, CA (US); and Giao Pham, Milpitas, CA (US)
Assigned to Power Integrations, Inc., San Jose, CA (US)
Filed by POWER INTEGRATIONS, INC., San Jose, CA (US)
Filed on Jan. 22, 2016, as Appl. No. 15/4,454.
Application 15/004,454 is a continuation of application No. 14/308,467, filed on Jun. 18, 2014, granted, now 9,343,978.
Application 14/308,467 is a continuation of application No. 13/595,605, filed on Aug. 27, 2012, granted, now 8,767,414, issued on Jul. 1, 2014.
Application 13/595,605 is a continuation of application No. 13/184,349, filed on Jul. 15, 2011, granted, now 8,279,627, issued on Oct. 2, 2012.
Application 13/184,349 is a continuation of application No. 12/412,122, filed on Mar. 26, 2009, granted, now 8,000,114, issued on Aug. 16, 2011.
Application 12/412,122 is a continuation of application No. 11/543,543, filed on Oct. 4, 2006, granted, now 7,518,885, issued on Apr. 14, 2009.
Prior Publication US 2016/0156273 A1, Jun. 2, 2016
Int. Cl. H02M 3/335 (2006.01)
CPC H02M 3/33515 (2013.01) [H02M 3/33507 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method for controlling a power converter switch to regulate power delivered to an output of a power converter, comprising:
operating the power converter switch in a first duty cycle control mode in response to a feedback signal being between a first feedback signal value and a second feedback signal value, wherein said first duty cycle control mode includes modulating a peak switch current of the power converter switch in response to the feedback signal, and switching the power converter switch at a substantially fixed first switching frequency value;
operating the power converter switch in a second duty cycle control mode in response to the feedback signal being between the second feedback signal value and a third feedback signal value, wherein said second duty cycle control mode includes modulating the switching frequency in response to the feedback signal, and maintaining the peak switch current substantially at a peak switch current threshold value;
operating the power converter switch in a third duty cycle control mode in response to the feedback signal being between the third feedback signal value and a fourth feedback signal value, wherein said third duty cycle control mode includes modulating the peak switch current of the power converter switch in response to the feedback signal and switching the power converter switch at a substantially fixed second switching frequency value; and
transitioning from the first duty cycle control mode to the second duty cycle control mode in response to the peak switch current reaching the peak switch current threshold value.