Patent ID: 11916481
Assignee: FREMONT MICRO DEVICES CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A Buck constant voltage driver comprising: a power tube control module, an output voltage acquisition module, an output voltage control module, a power tube and a sampling resistor,
wherein the power tube and the sampling resistor are connected in series between a chip external power supply terminal and a chip ground, the output voltage acquisition module is operable to acquire an output voltage of the Buck constant voltage driver, the output voltage control module is operable to implement an error amplification on the output voltage acquired by the output voltage acquisition module and a preset first reference voltage and to enable the power tube control module to control a switch-on and switch-off of the power tube based on an error amplification result for maintaining the output voltage of the Buck constant voltage driver constant;
wherein the Buck constant voltage driver further comprises:
an output voltage compensation module, wherein an input terminal of the output voltage compensation module is connected between the sampling resistor and the power tube to acquire a sampling voltage on the sampling resistor, an output end of the output voltage compensation module is connected with an input terminal of the output voltage control module, wherein the output voltage compensation module is operable to acquire an output current information based on the sampling voltage on the sampling resistor, and to compensate the preset first reference voltage according to the output current information, thus maintaining the output voltage of the Buck constant voltage driver constant, under different output current conditions.