NCV7680特性介紹及其應(yīng)用

NCV7680是On Semi公司的線性穩(wěn)流及控制器，包含8個線性可編程恒流源，能支持高達(dá)每通道75 mA的發(fā)光二極管(LED)驅(qū)動電流。設(shè)計用于汽車固態(tài)組合尾燈(RCL)的穩(wěn)流和控制，支持兩個亮度等級，一個用于停車，另一個用于尾部照明。典型應(yīng)用包括組合尾燈、日間行車燈(DRL)、霧燈、中央高位停車燈(CHMSL)陣列、轉(zhuǎn)向信號燈和液晶顯示器(LCD)背光。本文介紹了NCV7680主要特性，方框圖，升壓模式和多種應(yīng)用電路，以及NCV7680-NCV3163評估板主要特性。

圖1。NCV7680方框圖

圖2。NCV7680帶外接FET鎮(zhèn)流晶體管的應(yīng)用框圖

圖3。NCV7680不帶外接FET鎮(zhèn)流晶體管的應(yīng)用框圖

圖4。NCV7680升壓模式框圖

圖5。NCV7680停車燈應(yīng)用框圖

圖6。NCV7680尾燈應(yīng)用框圖

圖7。NCV7680 PWM工作電路（LCD背光應(yīng)用）

圖8。閉鎖電路


NCV7680-NCV3163評估板

The NCV7680 is an octal LED driver designed for automotive LED rear combination lamps. External programmability of the NCV7680 allows the user to set the tail current and stop currents using a single resistor for each function. An optional external FET is used to help distribute power for high power systems.

The NCV7680-NCV3163 Evaluation Board includes both an NCV7680 (octal driver) and NCV3163 (Boost Regulator). The NCV3163 allows for an increased number of LEDs per NCV7680 output by boosting the LED string anode voltage. The DIAG pin is brought out for reporting of open circuit conditions.

NCV7680-NCV3163評估板特性 ：

STOP Input Switch

DIAG Output

LED Isolation

STOP Programming Current

External PWM Input

Adjustable Boost Circuit with Internal Switch

RoHS Compliant



圖9。NCV7680-NCV3163評估板外形圖

圖10。NCV7680-NCV3163評估板電路圖