The new series of devices simplify the design of efficient and reliable lighting schemes and provide precise functions to enhance road safety.
On semiconductor (NASDAQ: on) launched a new series of four devices to promote the high-level performance and innovative functions of automobile exterior and interior lighting expected by automobile manufacturers and consumers. The new series is designed specifically for low-power solid-state lighting, including two LED drivers (ncv7683 and ncv7685) and two current controllers (ncv7691 and ncv7692).
In order to improve road safety, automobile manufacturers are moving from simple “on / off” operation to sophisticated system, combining motion and variable intensity in combined tail lights (RCL), turn signal lights, fog lights and other externally adjusted LED clusters to send clearer and higher visibility warnings to other road users.
Ncv7685 and ncv7683 integrate 12 and 8 linear programmable current sources respectively, so that they can drive multiple strings of LEDs with a current of up to 100 mA per channel. These devices provide a range of configurable options, including daisy chain, lighting brightness control, current regulation, sequence function and channel combination. Ncv7685 adopts 8-bit I2C interface with CRC8 error detection function, which can adjust individual output current through pulse width modulation (PWM), and is used for advanced diagnosis, including LED string open circuit detection or undervoltage detection. It also provides special diagnosis pins. According to specific design requirements, DC-DC controller and / or LDO regulator can be used to power ncv7685.
Ncv7691 provides a stable wide current range for driving one or more strings of LEDs, requiring only an external NPN bipolar transistor and a feedback resistor. The driver provides design flexibility, can add additional single channel in multi-channel system, and supports dimming function through its PWM input. Ncv7691 includes series open circuit, short circuit and thermal shutdown functions to ensure the safe and reliable operation of basic lighting. The derived ncv7692 provides faster response time and reduces the threshold of open circuit load detection.
Jim alvernaz, automotive products division of ansenmey semiconductor, said: “the performance and functional possibilities of LED lighting have been required by automobile manufacturers and consumers. Sophisticated lighting drivers and controllers are crucial to turning ideas into reality. In addition to important safety benefits, led based automotive lighting also creates exciting opportunities for automotive engineers to enhance their brand and image.”