High-precision and high-reliability LED vehicle lamp driving circuit

Abstract

The invention discloses a high-precision and high-reliability LED vehicle lamp driving circuit. The circuit comprises a bias module, an error amplification module, a current detection compensation module, a pulse width modulation module, a PWM control module, an output driving module, an oscillator module (OSC), a high-precision high-reliability undervoltage protection circuit (UVLO), a high-precision high-reliability overvoltage protection circuit (OVLO), a high-precision wide-voltage-range over-temperature protection circuit (OTP) and a power switch NMOS tube MG. According to the driving circuit provided by the invention, on one hand, the common-mode interference detection circuit is adopted in the temperature protection circuit, so that common-mode noise interference is avoided, and the protection precision is improved; and on the other hand, a power supply burr detection circuit is adopted in an overvoltage protection circuit and an undervoltage protection circuit, a reset signal is output under an abnormal condition, a protection signal is locked in advance, and the reliability of the circuit is improved. The invention can be widely applied to various high-voltage integrated circuit chips.

Description

technical field [0001] The invention relates to a high-precision and high-reliability LED car lamp drive circuit, which belongs to the technical field of integrated circuits. Background technique [0002] Modern cars need to use more and more lights. Common exterior lights include: headlights, fog lights, license plate lights, reversing lights, brake lights, turn signals, position lights, position lights, parking Lights and warning lights and daytime running lights; common interior lights include dome lights, reading lights, luggage compartment lights, door lights, step lights, instrument lights, work lights, dashboard warning lights, etc. LED car lights are directly converted from electric energy to light energy by light-emitting diodes. Compared with ordinary car bulbs, the power consumption is only equivalent to 1 / 10 of traditional lights, which can better save fuel consumption and protect car circuits from being burned out by excessive load current. Compared with tradit...

AI Technical Summary

Problems solved by technology

Very severe common-mode noise due to large fluctuations in supply voltage and substrate potential

Images