浅谈On Semi NCV7692汽车LED灯电流控制的解刨 嵌入式技术技术文章

LED brightness levels are easily programmed using an external resistor in series with the bipolar transistor. The use of the resistor gives the user the flexibility to use the device over a wide range of currents. Multiple strings of LEDs can be operated with a single NCV7692 device. Set back power limit reduces the drive current during overvoltage conditions.

The device is available in a SOIC−8 package.

NCV7692主要特性:

• Constant Current Output for LED String Drive

• External Bipolar Device for Wide Current Range Flexibility

♦ With BCP56 Transistor, Can Drive Multiple Strings Concurrently (ref. Datasheet Info)

• External Programming Current Resistor

• Pulse Width Modulation (PWM) Control

• Negative Temperature Coefficient Current Control Option

• Open LED String Diagnostic

• Short−Circuit LED String Diagnostic

• Multiple LED String Control

• Overvoltage Set Back Power Limitation

• SOIC−8 Package

• AEC−Q100 Qualified and PPAP Capable

• These are Pb−Free Devices

NCV7692应用:

• Rear Combination Lamps (RCL)

• Daytime Running Lights (DRL)

• Fog Lights

• Center High Mounted Stop Lamps (CHMSL) Arrays

• Turn Signal and Other Externally Modulated Applications

• General Automotive Linear Current LED Driver

图1.NCV7692框图

图2.NCV7692应用框图