本文選題：LED驅動 + 高壓穩(wěn)壓電路��； 參考：《電子技術應用》2017年03期

【摘要】：在LED驅動電路中,若采用傳統(tǒng)的BUCK型DC-DC降壓方式或利用MOS管級聯鉗制降壓方式為芯片內部低壓模塊提供電源,存在不易集成化和受高壓工藝限制等問題。為此,提出了一種改進的高壓穩(wěn)壓電路,利用高壓LDMOS構成電流源對RC電路充電,電容上的電壓經過線性穩(wěn)壓器穩(wěn)壓后給芯片提供穩(wěn)定的低壓電源。該電路只需外置電容,其他部分均可集成在一塊芯片上�；谌A虹宏力0.5μm 700V BCD工藝對電路進行仿真驗證,在0~311 V周期脈動高電壓輸入條件下,電路能穩(wěn)定輸出4.97 V;負載電流在0~10 mA范圍內變化,負載調整率為11.6 mV/mA;在-40℃~130℃溫度范圍內,輸出電壓溫度系數為27.2 ppm/℃。仿真結果表明,該高壓穩(wěn)壓電路各指標參數均滿足預期要求。
[Abstract]:In the LED drive circuit, if the traditional buck DC-DC step-down mode or the MOS tube cascade clamping mode is used to supply power to the low voltage module inside the chip, it is difficult to integrate and is limited by the high-voltage technology and so on. For this reason, an improved high voltage regulator circuit is proposed. The current source is composed of high voltage LDMOS to charge the RC circuit. The voltage on the capacitor is stabilized by a linear voltage regulator to provide a stable low voltage power supply to the chip. The circuit requires only external capacitors and the rest of the circuit can be integrated on a single chip. Based on Huahong Hongli 0.5 渭 m 700V BCD process, the circuit is verified by simulation. Under the input condition of 0 ~ 311V period pulsating high voltage, the circuit can output 4.97 V stably, and the load current changes in the range of 0 ~ 10 Ma. The load adjustment rate is 11.6mV / mA.The output voltage temperature coefficient is 27.2 ppm/ 鈩，

本文編號：2110282