has unveiled ALED6000 single-chip automotive LED driver which comes with an
integrated DC/DC converter. It is a low-BoM solution that offers design
flexibility and also keeps the lighting intensity consistent.
The ALED6000 drives a single string of LEDs that are suitable for exterior
lighting like headlights, rear lights, daytime running lights, stop lights,
interior lighting, and turn signals. It also has a wide input-voltage range of
4.5V to 61V. The ALED6000 has a dedicated pin to apply the PWM control signal
and it also implements digital dimming. It also has a sync pin and enables pin
to ensure low noise in multi-device applications. The output current is monitored efficiently
with a sense resistor and has an accurate output current within 3.2%. The
quiescent current is extremely low. Another exciting feature is a VBIAS
auxiliary-input pin and pulse-skipping operation at light load. This ensures
high efficiency across the load range.
There is an on-chip converter that allows buck/boost, buck, and
floating-boost topologies that give flexibility to power LED strings which
handle supply fluctuations and require a voltage above or below the input
voltage. . The converter can operate in low-dropout mode
with 100% duty cycle. In case of over-current, the ALED6000 ensures pulse-by-pulse protection so as
to limit the output current. The soft-start circuitry limits inrush current and
thermal protection with auto-recovery. The switching frequency is limited and
converted by the output-current limit. This allows the inductor to be optimized
for high energy efficiency, small size, fast dynamic response, and low output
ALED6000 automotive LED driver, qualified by AEC-Q100 is now in
production in the HTSSOP16 package.
Source – Press release of
Image Source: Press
release of "STMicroelecronics"