A circuit for adaptively adjusting output drive capability

Abstract

The invention discloses a circuit capable of adaptively adjusting output driving capability. The circuit comprises an adjustable charging current / resistant equivalent circuit, an adjustable discharging current / resistance equivalent circuit, a driving output charging and discharging speed detection circuit, a charging control circuit and a discharging control circuit. During a GATE conduction period, the charging control circuit is conducted, the discharging control circuit is disconnected, the adjustable charging current / resistant equivalent circuit is used for charging a GATE, and the drivingoutput charging and discharging speed detection circuit is used for detecting charging slope of the GATE and output CTRP; and during a GATE disconnection period, the charging control circuit is disconnected, the discharging control circuit is conducted, the adjustable discharging current / resistant equivalent circuit is used for discharging the GATE, detecting discharging slope of the GATE and output CTRN. By the circuit, the problem that the output driving capability of the driving circuit cannot be automatically changed with changes of parasitic parameters of a power distribution pipe core and a circuit application board is solved.

Description

technical field [0001] The invention relates to a switching power supply drive circuit, in particular to a circuit for self-adaptive adjustment of output drive capability. Background technique [0002] With the rapid development of switching power supply technology, the requirements for related switching power supply products are also getting higher and higher. For example: higher chip integration, stronger chip reliability, wider chip compatibility, better chip performance, and a wider range of applications are required. [0003] At present, the design of switching power supply drive circuit is a problem that needs to be considered as a compromise between chip work efficiency and conduction radiation compatibility: for the work efficiency and conduction radiation compatibility problems of products with built-in power distribution cores, existing drive technologies generally use drive The method of one-to-one correspondence between capabilities and power distribution dies, ...

AI Technical Summary

Problems solved by technology

[0003] At present, the design of switching power supply drive circuit is a problem that needs to be considered as a compromise between chip work efficiency and conduction radiation compatibility: for the work efficiency and conduction radiation compatibility problems of products with built-in power distribution cores, existing drive technologies generally use drive The method of one-to-one correspondence between capabilities and power distribution dies, its main disadvantage is that different versions of drive capabilities are required for different power distribution dies, resulting in too many chip versions, which is inconvenient for production and stocking; for products with external power distribution dies Due to the existing work efficiency and conduction radiation compatibility problems, the existing drive technology generally adopts adding different sizes of resistors between the application peripheral drive and the power distribution core.

Since the traditional drive technology cannot automatically change the output drive capability with the change of the power distribution die and the parasitic parameters of the circuit application board, it greatly limits the compatibility and application range of the chip.

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