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NCV7680是On Semi公司的線性穩流及控制器，包含8個線性可編程恒流源，能支持高達每通道75 mA的發光二極管(LED)驅動電流。設計用于汽車固態組合尾燈(RCL)的穩流和控制，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，升壓模式和多種應用電路，以及NCV7680-NCV3163評估板主要特性，電路圖和材料清單（BOM）。
The NCV7680 consists of eight linear programmable constant current sources. The part is designed for use in the regulation and control of LED based Rear Combination Lamps for automotive applications. System design with the NCV7680 allows for two brightness levels, one for stop and one for tail illumination, or optional PWM control can also be implemented.
Discrete LED brightness levels are easily programmed (stop current value, tail duty cycle value) optional external ballast FET allows for power distribution on designs requiring high currents. Set back power limit reduces the drive current during overvoltage conditions. This is most useful for low current applications when no external FET is used.
NCV7680主要特性：
Constant Current Outputs for LED String Drive??
LED Drive Current up to 75mA per Channel ?
Open LED String Diagnostic with Open-Drain Output ?
Slew Rate Control? ?
Low Dropout Operation ?
External Modulation Capable? ?
On-chip 1 kHz Tail PWM Dimming
Stop Current Set Point programmability?????? ?
Tail Dimming Set Point programmability
Overvoltage Set Back Power Limitation
Pb-Free
NCV7680優勢:
LED devices are best controlled with current drive due to their exponential voltage characteristics
Sufficient drive for most popular low current LED devices
System functionality back to the microprocessor
Eliminates EMI concerns
Maintains functionality during drops in automotive battery voltage
Flexible for many system operation setups
Simplifies system design.
Easy programmability with one resistor
Easy programmability with one resistor
Keeps IC temperature lower at extended voltage range.
Meets lead free regulations
NCV7680應用:
Automotive Rear Combination Lamps
Daytime Running Lights
Fog Lights
Center High Mounted Stop Lamps
Turn Signal and Other Externally Modulated Applications
LCD Backlighting
Lighting Module
圖1。NCV7680方框圖
圖2。NCV7680帶外接FET鎮流晶體管的應用框圖
圖3。NCV7680不帶外接FET鎮流晶體管的應用框圖
圖4。NCV7680升壓模式框圖
圖5。NCV7680停車燈應用框圖
圖6。NCV7680尾燈應用框圖
圖7。NCV7680 PWM工作電路（LCD背光應用）
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
NCV7680-NCV3163評估板材料清單（BOM）：
The NCV7680 consists of eight linear programmable constant current sources. The part is designed for use in the regulation and control of LED based Rear Combination Lamps for automotive applications. System design with the NCV7680 allows for two brightness levels, one for stop and one for tail illumination, or optional PWM control can also be implemented.
Discrete LED brightness levels are easily programmed (stop current value, tail duty cycle value) optional external ballast FET allows for power distribution on designs requiring high currents. Set back power limit reduces the drive current during overvoltage conditions. This is most useful for low current applications when no external FET is used.
NCV7680主要特性：
Constant Current Outputs for LED String Drive??
LED Drive Current up to 75mA per Channel ?
Open LED String Diagnostic with Open-Drain Output ?
Slew Rate Control? ?
Low Dropout Operation ?
External Modulation Capable? ?
On-chip 1 kHz Tail PWM Dimming
Stop Current Set Point programmability?????? ?
Tail Dimming Set Point programmability
Overvoltage Set Back Power Limitation
Pb-Free
NCV7680優勢:
LED devices are best controlled with current drive due to their exponential voltage characteristics
Sufficient drive for most popular low current LED devices
System functionality back to the microprocessor
Eliminates EMI concerns
Maintains functionality during drops in automotive battery voltage
Flexible for many system operation setups
Simplifies system design.
Easy programmability with one resistor
Easy programmability with one resistor
Keeps IC temperature lower at extended voltage range.
Meets lead free regulations
NCV7680應用:
Automotive Rear Combination Lamps
Daytime Running Lights
Fog Lights
Center High Mounted Stop Lamps
Turn Signal and Other Externally Modulated Applications
LCD Backlighting
Lighting Module
圖1。NCV7680方框圖
圖2。NCV7680帶外接FET鎮流晶體管的應用框圖
圖3。NCV7680不帶外接FET鎮流晶體管的應用框圖
圖4。NCV7680升壓模式框圖
圖5。NCV7680停車燈應用框圖
圖6。NCV7680尾燈應用框圖
圖7。NCV7680 PWM工作電路（LCD背光應用）
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
NCV7680-NCV3163評估板材料清單（BOM）：
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