The NCV7681 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 and blinking

functions for automotive applications. System design with the

NCV7681 allows for two programmed levels for stop (100 Duty

Cycle) and tail illumination (programmable Duty Cycle), or an

optional external PWM control can be implemented.

LED brightness levels are easily programmed (stop is programmed

to the absolute current value, tail is programmed to the duty cycle)

with two external resistors. The use of an 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 power applications when no

external FET is used.

The device is available in a SOIC−16 WB package with exposed pad.

Features

• Constant Current Outputs for LED String Drive

• LED Drive Current up to 100 mA per Channel

• Open LED String Diagnostic with Open−Drain Output in All Modes

• Slew Rate Control Eliminates EMI Concerns

• Low Dropout Operation for Pre−Regulator Applications

• External Modulation Capable

• On−chip 800 Hz Tail PWM Dimming

• Single Resistor for Stop Current Set Point

• Single Resistor for Tail Dimming Set Point

• Overvoltage Set Back Power Limitation

• AEC−Q100 Qualified and PPAP Capable

• 16 Lead SOICW Exposed Pad

• Improved EMC Performance

• Latch−Off Function on Open String (NCV7681L)

♦ Restart Option of Unaffected Strings

• Over Temperature Fault Reporting

• These are Pb−Free Devices

Applications

• Rear Combination Lamps (RCL)

• Daytime Running Lights (DRL)

• Fog Lights

• Center High Mounted Stop Lamps (CHMSL) Arrays

• Turn Signal and Other Externally Modulated Applications

• Signature Lamp

NCV7681A属于集成电路（IC） > LED 驱动器。安森美半导体公司制造生产的NCV7681ALED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。