ON Semiconductor introduced two new devices for use in vehicle lighting systems. The NCV78763 advanced smart power ballast and dual channel LED driver provides a highly efficient single-chip automotive lighting solution that is capable of driving two strings of LEDs up to 60 volts (V). A DC current of 1.6 amperes (A) can be supported on each output. The built-in current-mode voltage booster controller enables input current filtering. An internal pulse-width modulated (PWM) dimming function, covering frequencies up to 4 kilohertz (kHz), is also included in addition to the option of PWM direct-feed for full frequency and resolution control from the external microcontroller. Optimized for front lighting applications, this device can be employed in high beam, low beam, turn indicator, static cornering, fog and daytime running lights.
Also being introduced is the NCV7691 current controller for automotive LED lamps. Targeted predominantly at automotive rear combination lamps (RCL), center high-mounted stop lamps (CHMSL), and day-time running lights (DRL), this highly integrated pre-driver contains PWM and diagnostic capabilities, as well as battery connection and negative temperature coefficient (NTC) input in a single chip. Through use of external bipolar transistor(s) combined with feedback resistors, this device accurately regulates the LED driver current – with up to eight LED strings being driven concurrently. Engineers have the flexibility to add channels to create multi-channel systems. A dedicated dimming feature is included via the PWM input pin. LED brightness levels can be programmed in a straightforward manner using an external resistor in series with the bipolar transistor.
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