US 11,881,780 B2
Dynamic biasing circuit for main comparator to improve load-transient and line-transient performance of buck converter in 100% mode
Manuel Wiersch, Freising (DE); Gerhard Thiele, Dachau (DE); Antonio Priego, Freising (DE); and Johann Erich Bayer, Thonhausen (DE)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Feb. 24, 2023, as Appl. No. 18/173,859.
Application 18/173,859 is a division of application No. 16/590,021, filed on Oct. 1, 2019, granted, now 11,616,439.
Claims priority of provisional application 62/740,103, filed on Oct. 2, 2018.
Prior Publication US 2023/0198402 A1, Jun. 22, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/0032 (2021.05); H02M 1/0048 (2021.05)] 16 Claims
OG exemplary drawing
 
1. A voltage converter comprising:
a converter input and a converter output, wherein the converter input has a voltage VIN, and the converter output has a voltage VOUT;
a high-side switch;
a low-side switch;
a comparator having first and second comparator inputs, a bias input, and a comparator output, wherein the first comparator input is coupled to a feedback voltage terminal providing a signal proportional to VOUT, and the second comparator input is coupled to a reference voltage terminal;
a bias current source coupled to the bias input and configured to provide a bias current;
a dynamic biasing circuit coupled to the bias input and configured to provide a supplemental bias current responsive to the voltage converter operating in a 100% mode, wherein the supplemental bias current is proportional to a difference between VIN and VOUT;
control logic having a logic input and a logic output, wherein the logic input is coupled to the comparator output; and
a gate driver having a driver input and first and second driver outputs, wherein the driver input is coupled to the logic output, the first driver output is coupled to the high-side switch, and the second driver output is coupled to the low-side switch.