Texas Instruments Corporation

Zhujun Li

Zejing Wang

Songming Zhou

Yu Ying Wang

Yu Wang

A system includes: 1) a battery configured to provide an input voltage (VIN); 2) switching converter circuitry coupled to the battery, wherein the switching converter circuitry includes a power switch; 3) a load coupled to an output of the switching converter circuitry; and 4) a control circuit coupled to the power switch. The control circuit includes: 1) a switch driver circuit coupled to the power switch; 2) a summing comparator circuit configured to output a first control signal that indicates when to turn the power switch on; and 3) an analog on-time extension circuit configured to extend an on-time of the power switch by gating a second control signal with the first control signal, wherein the second control signal indicates when to turn the power switch off.

Switching converter with analog on-time extension control

A switching converter controller includes an on-time timer circuit coupled to a switch driver circuit. The on-time timer circuit includes an up/down counter with a clock input node. The on-time timer circuit also includes a latch with an input coupled to an external clock signal and with an output coupled to the clock input node. The on-time timer circuit also includes an on-time capacitor array with a control terminal coupled an output of the up/down counter.

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Shanghai, China

Zhujun Li