US 12,463,620 B2
Feedback control circuit of pulse-frequency modulation converter that adaptively adjusts on-time control signal and associated feedback control method
Han-Chi Chiu, Hsinchu (TW); Jui-Hung Wei, Hsinchu (TW); Ke-Deng Huang, New Taipei (TW); and John-San Yang, Hsinchu County (TW)
Assigned to Airoha Technology Corp., Hsinchu (TW)
Filed by Airoha Technology Corp., Hsinchu (TW)
Filed on Dec. 28, 2023, as Appl. No. 18/399,660.
Claims priority of provisional application 63/451,649, filed on Mar. 13, 2023.
Prior Publication US 2024/0313747 A1, Sep. 19, 2024
Int. Cl. H03K 3/017 (2006.01); H03K 3/037 (2006.01)
CPC H03K 3/017 (2013.01) [H03K 3/037 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A feedback control circuit of a pulse-frequency modulation (PFM) converter, comprising:
an on-time timer circuit, arranged to generate an on-time control signal for controlling an on-time duration of a switch circuit included in a power stage circuit of the PFM converter; and
a detection circuit, arranged to control the on-time timer circuit to adaptively adjust an on-time duration of the on-time control signal according to a change in a pulse interval between two successive inductor current pulses of the PFM converter.