Cycle control white light-emitting diode (WLED) driving chip and driving circuit

Abstract

The invention is applicable in the field of integrated circuits, and provides a cycle control white light-emitting diode (WLED) driving chip and a driving method. The cycle control WLED driving chip comprises six package pins including a state control pin, an input pin, a boost control pin, an output pin, a feedback pin and a grounding pin, a logic control unit used for performing logic judgment on state control signals and outputting corresponding logic state signals, and a boosting unit used for generating boost control signals according to the logic state signals and outputting boost direct current voltage which enables a WLED to realize corresponding state changes. The cycle control WLED driving chip adopts the logic control unit and the boosting unit to replace a logic control chip and a boost chip, integrates the two chips into an independent chip, deletes repeated reference units, reduces the package area of the driving chip, optimizes a package process, reduces the manufacturing cost, and simplifies application circuits of the driving chip.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to a cycle control WLED drive chip and a drive circuit. Background technique [0002] At present, white light emitting diodes (White Light Emitting Diode, WLED) make LED get rid of only being used in indicator lights, neon lights, etc. , In addition, WLED can also act as a backlight source for Liquid Crystal Display (LCD) to replace the previous Cold Cathode Fluorescent Lamp (CCFL). With the wide application of WLED, the drive design of WLED is also controlled by The single switch in the past has been developed into a WLED driver design with state cycle control. [0003] The so-called WLED driver chip with state cycle control refers to repackaging the boost (Boost) WLED driver chip and a logic control chip after connecting it, and controlling the boost conduction time of the boost driver chip through the logic control chip, so as to realize When the input voltage switches contin...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a cycle control WLED driver chip, which aims to solve the problems of the existing SOP8 package driver chip with large area, complicated packaging process, high manufacturing cost and complicated driving application circuit.

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