US 11,817,777 B1
Spread spectrum adaptive on time voltage converter
Junwen Zhang, Shanghai (CN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Jul. 15, 2022, as Appl. No. 17/865,744.
Int. Cl. H02M 1/44 (2007.01); H02M 3/156 (2006.01); H04B 1/69 (2011.01)
CPC H02M 1/44 (2013.01) [H02M 3/156 (2013.01); H04B 1/69 (2013.01)] 20 Claims
OG exemplary drawing
 
18. A circuit for modulating a drive signal in a switching voltage converter, the circuit comprising:
a first amplifier having first and second amplifier inputs and a first amplifier output;
a first transistor coupled between a first reference voltage terminal and the first amplifier input, and having a first control terminal;
a second transistor coupled between a second reference voltage terminal and the first amplifier input, and having a second control terminal;
a first inverter having a first inverter input and a first inverter output, the first inverter input coupled to the first amplifier output, and the first inverter output coupled to the first control terminal;
a second inverter having a second inverter input and a second inverter output, the second inverter input coupled to the first inverter output, and the second inverter output coupled to the second control terminal;
a second amplifier having third and fourth amplifier inputs and a second amplifier output, the third amplifier input coupled to the second amplifier input;
a third transistor coupled between an output voltage terminal and the fourth amplifier input, and having a third control terminal coupled to the second amplifier output;
a fourth transistor having a current terminal coupled to the output voltage terminal, and having a fourth control terminal coupled to the second amplifier output;
a fifth transistor coupled between the fourth transistor and a ground terminal, and having a fifth control terminal coupled to the fourth transistor;
a comparator having first and second comparator inputs, the first comparator input coupled to a voltage divider; and
a sixth transistor coupled between the ground terminal and the second comparator input.