High-efficiency automotive LED driver with boost controller

11-02-2015 | Texas Instruments | Power

The Texas Instruments (TI) LP8860-Q1 is an automotive high-efficiency LED
driver with boost controller. It has four high-precision current sinks that
can be controlled by a PWM input signal, an SPI/I2C master, or both.

The boost converter has adaptive output voltage control based on the LED
current sinks headroom voltages. This feature minimizes the power
consumption by adjusting the voltage to lowest sufficient level in all
conditions. Boost controller supports spread spectrum for switching
frequency and an external synchronization with dedicated pin. The high
switching frequency allows the LP8860-Q1 to avoid disturbance for AM radio
band.

The device supports built-in Hybrid PWM and current dimming which reduces
EMI, extends the LED lifetime, and increases the total optical efficiency.
Phase Shift PWM allows reduced audible noise and smaller boost output
capacitors. Also, the LP8860-Q1 can drive an external power line FET.

To support automotive stop / start conditions, the input voltage range for
the LP8860-Q1 is 3V to 48V. The device also integrates extensive safety and
protection features.

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